CN115739014A - Electroplating wastewater treating agent and preparation method and application thereof - Google Patents
Electroplating wastewater treating agent and preparation method and application thereof Download PDFInfo
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- CN115739014A CN115739014A CN202210911978.8A CN202210911978A CN115739014A CN 115739014 A CN115739014 A CN 115739014A CN 202210911978 A CN202210911978 A CN 202210911978A CN 115739014 A CN115739014 A CN 115739014A
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- 238000009713 electroplating Methods 0.000 title claims abstract description 80
- 239000002351 wastewater Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 21
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 58
- 244000280244 Luffa acutangula Species 0.000 claims description 58
- 235000009814 Luffa aegyptiaca Nutrition 0.000 claims description 58
- 239000000203 mixture Substances 0.000 claims description 39
- 238000002156 mixing Methods 0.000 claims description 31
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 238000000197 pyrolysis Methods 0.000 claims description 29
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 claims description 26
- 239000002243 precursor Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 claims description 18
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 claims description 18
- 239000008139 complexing agent Substances 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 229940107700 pyruvic acid Drugs 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000001354 calcination Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 10
- 229960000583 acetic acid Drugs 0.000 claims description 9
- 239000012362 glacial acetic acid Substances 0.000 claims description 9
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
- 229910001868 water Inorganic materials 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 230000003197 catalytic effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 239000002346 layers by function Substances 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 72
- 239000004408 titanium dioxide Substances 0.000 description 36
- 239000010410 layer Substances 0.000 description 25
- 230000000694 effects Effects 0.000 description 16
- 238000001179 sorption measurement Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 13
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 12
- 239000002028 Biomass Substances 0.000 description 11
- 229910001385 heavy metal Inorganic materials 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 239000003344 environmental pollutant Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 230000000536 complexating effect Effects 0.000 description 9
- 125000000524 functional group Chemical group 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000011148 porous material Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 8
- 230000001788 irregular Effects 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 238000006864 oxidative decomposition reaction Methods 0.000 description 7
- 239000003513 alkali Substances 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000003610 charcoal Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 230000004913 activation Effects 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 229910001431 copper ion Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 235000012245 magnesium oxide Nutrition 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 4
- 229910001453 nickel ion Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000010525 oxidative degradation reaction Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003980 solgel method Methods 0.000 description 4
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 4
- 229910001427 strontium ion Inorganic materials 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 description 3
- 150000001491 aromatic compounds Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005087 graphitization Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Inorganic materials [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 3
- 239000010457 zeolite Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- -1 organic matters Chemical class 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
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- Water Treatment By Sorption (AREA)
Abstract
The invention relates to an electroplating wastewater treating agent, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The electroplating wastewater treating agent integrates the functions of complex breaking and flocculation and sedimentation of electroplating wastewater, realizes high-efficiency removal of the electroplating wastewater through mutual synergistic promotion of various structural functional layers, and has wide application prospect.
Description
Technical Field
The invention relates to an electroplating wastewater treating agent, a preparation method and application thereof, and belongs to the technical field of wastewater treatment.
Background
The content of heavy metals in the electroplating wastewater is generally dozens of milligrams per liter, but the total amount of pollutants and heavy metals is large due to the huge wastewater discharge. Although some heavy metal ions are necessary trace elements in organisms, when the intake amount exceeds a certain threshold value, the trace elements become toxins, directly influence the growth and development of the organisms and even threaten the survival of the organisms.
The unprecedented situation of industries such as automobiles, jewelry, aerospace and the like promotes the rapid development of the electroplating industry. Meanwhile, the discharge problem of the electroplating wastewater cannot be ignored, and the deep treatment and standard discharge of the electroplating wastewater containing the heavy metal complexing agent are particularly concerned and solved.
Adsorption is a common method for treating electroplating wastewater by a physical method. The adsorbent can be selected from zeolite, fly ash, activated carbon, etc. The zeolite is a natural mineral material and has a rich porous structure, so that the zeolite has good adsorption performance on heavy metal ions in the wastewater; the fly ash is solid waste generated by a thermal power plant or a smelting enterprise, and can be used for treating electroplating wastewater containing heavy metals due to good adsorption capacity; the activated carbon is a well-known adsorption material, can perform nonselective adsorption on pollutants, mainly depends on intermolecular force, but the treatment effect of the adsorbents on the electroplating wastewater containing the heavy metal complexing agent is poor, and the treatment method needs to be combined with a Fenton oxidation method, flocculation precipitation and the like, so that the defects of complex process and unobvious treatment effect are caused.
In view of the above-mentioned defects, the present designer has actively studied and innovated to create an electroplating wastewater treatment agent, and a preparation method and application thereof, so that the electroplating wastewater treatment agent has industrial utilization value.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an electroplating wastewater treating agent and a preparation method and application thereof.
The invention relates to an electroplating wastewater treatment agent, which comprises an activated biochar substrate and a metal oxide layer attached to the surface of the activated biochar substrate; the activated charcoal matrix is prepared from loofah sponge powder and potassium hydroxide;
the activated charcoal matrix is obtained by mixing loofah sponge powder and potassium hydroxide and then pyrolyzing the mixture at a certain temperature; the biomass loofah sponge is used as the original material, the components of the loofah sponge are complex, organic matters are dehydrated and condensed to form aromatic compounds in the pyrolysis process, and then carbon skeletons are formed, and the graphitization temperature can not be reached at the pyrolysis temperature of 380-780 ℃, so that the biochar produced by pyrolysis mainly takes amorphous carbon as the main component, and a large amount of oxygen-containing functional groups are reserved. The increase of the number of the oxygen-containing functional groups can improve the capture capacity of the material to the pollutants, and correspondingly improves the adsorption performance of the material. The oxygen-containing functional group can promote the transfer and transfer of electrons, improve the concentration of subsequent hydroxyl free radicals and increase the oxidative decomposition capacity of a complexing agent; the biomass charcoal prepared by KOH activation forms a molten mixture with biomass due to the fact that KOH can melt at a high temperature, certain components in the loofah sponge can be combined with KOH to form potassium salt, and when the temperature is further increased, gas can escape from the molten mixture, so that the mixture expands, and irregular pores are formed. In addition, potassium vapor is inserted into the carbon layer at high temperature, which causes the carbon skeleton lattice to be unbalanced, further increasing the disorder of the carbon layer. The acid washing step after pyrolysis removes potassium salt generated in the preparation process, and can dredge the porous structure blocked by the potassium salt to a certain extent, so that the specific surface area is increased, and finally, the obtained porous structure is high in surface roughness, has holes with different sizes similar to worm etching, and carbon walls are communicated with each other to form an irregular 3D frame structure, so that the specific surface area is greatly improved, the adsorption effect of the biochar is improved, and the subsequent flocculation step is reduced;
the raw materials for preparing the metal oxide layer comprise strontium nitrate, magnesium nitrate and water. The metal oxide layer is formed by mixing, soaking and calcining a biochar matrix, strontium nitrate, magnesium nitrate and water. Loading a layer of excessive alkali metal oxide to the pores and the surface of the biochar by a dipping and calcining method to obtain modified biochar, and promoting hydroxyl free radicals generated by subsequent catalysis by the excessive alkali metal oxide so as to increase the oxidative decomposition capacity of a complexing agent in the electroplating wastewater;
further, a strong catalytic layer is fixed on the surface of the metal oxide layer;
the preparation raw materials of the strong catalytic layer comprise absolute ethyl alcohol, tetrabutyl titanate, glacial acetic acid and pyruvic acid. The strong catalytic layer is formed by reacting absolute ethyl alcohol, tetrabutyl titanate, glacial acetic acid and pyruvic acid. Nanometer titanium dioxide particles are loaded in pores and surfaces of the modified biochar through a sol-gel method, the specific surface area of the surface of the modified biochar is increased due to the generation of the nanometer titanium dioxide particles on the surface layer, the adsorption performance of the modified biochar is improved, in addition, pyruvic acid is used as an electron receptor and can easily receive photo-generated electrons generated by titanium dioxide, so that the compounding of the photo-generated electrons and holes is effectively inhibited, the concentration of hydroxyl radicals in electroplating wastewater is improved, heavy metal ions in the electroplating wastewater are formed by coordination of coordination bonds and other complexing organic matters, the coordination bonds are oxidized by the hydroxyl radicals with super-strong oxidizing performance, so that the coordination bonds are broken, divalent copper ions and divalent nickel ions which originally have complexing states are freely introduced into a solution and are removed through alkali precipitation, and the complex complexing organic matters are finally oxidized by the hydroxyl radicals into micromolecular acid organic matters, carbon dioxide, water and the like;
in addition, the strontium and magnesium oxide loaded in the modified biochar can distort titanium dioxide crystal lattices, narrow the energy gap of a forbidden band of the titanium dioxide and generate red shift, so that the titanium dioxide can absorb light with a wider-range wavelength, and in addition, strontium ions can absorb light energy with higher energy and transfer the light energy to the titanium dioxide to help the titanium dioxide to absorb the light energy, so that the titanium dioxide has stronger oxidative degradation capability under visible light, and the treatment effect on electroplating wastewater is further improved.
A preparation method of an electroplating wastewater treating agent comprises the following specific preparation steps:
(1) Weighing loofah sponge, placing the loofah sponge outdoors, airing the loofah sponge, placing the loofah sponge into an oven, drying the loofah sponge for 24 hours at 105-110 ℃, crushing the loofah sponge, sieving the loofah sponge with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, pyrolyzing the mixture, cooling the mixture to room temperature after pyrolysis, and washing the mixture for 3 times respectively with hydrochloric acid and deionized water to obtain activated charcoal;
(2) Mixing the activated biochar with strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10 to 1;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10 to 1, putting the mixture into an ultrasonic oscillator, ultrasonically oscillating and dispersing the mixture at a frequency of 30-40 kHz, putting the dispersion into a conical flask with a stirrer, dripping tetrabutyl titanate with the mass of 50 percent of the absolute ethyl alcohol into the conical flask by using a dropping funnel, and stirring and mixing the mixture for 10-15 min by using the stirrer at a rotating speed of 200-300 r/min to obtain a precursor;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 1-2 h, filtering and separating to obtain filter residue, standing and aging for 2-3 days, putting into a muffle furnace, calcining for 1-2 h at 180-200 ℃, and discharging to obtain the electroplating wastewater treatment agent;
further, the step of pyrolysis in the step (1) is heating to 380 ℃ for 90min, and then heating to 780 ℃ for 2h.
An application of an electroplating wastewater treating agent for treating electroplating wastewater containing complexing agent.
Further, the specific application steps are as follows:
adding the electroplating wastewater treatment agent into electroplating wastewater containing a complexing agent to be treated according to the adding amount of 3-5 g/L, applying a xenon lamp light source with the illumination intensity of 5.0mW/cm & lt 2 & gt on the surface of the electroplating wastewater, stirring and reacting for 2-3 h at 25-30 ℃ by using a stirrer at the rotating speed of 150-200 r/min, adjusting the pH to 8 by using sodium hydroxide after the reaction is finished, standing and layering, centrifuging for 20min by using a centrifuge at the rotating speed of 4000r/min, and removing the lower-layer precipitate, wherein the upper-layer liquid is the treated electroplating wastewater.
By the scheme, the invention at least has the following advantages:
(1) The biomass loofah sponge is used as the original material, the components of the loofah sponge are complex, organic matters are dehydrated and condensed to form aromatic compounds in the pyrolysis process, and then carbon skeletons are formed, and the graphitization temperature can not be reached at the pyrolysis temperature of 380-780 ℃, so that the biochar produced by pyrolysis mainly takes amorphous carbon as the main component, and a large amount of oxygen-containing functional groups are reserved. And the increase of the number of the oxygen-containing functional groups can improve the capture capacity of the material to the pollutants, and correspondingly improve the adsorption performance of the material. The oxygen-containing functional group can promote the transfer of electrons, improve the concentration of subsequent hydroxyl radicals and increase the oxidative decomposition capacity of a complexing agent; the biomass charcoal prepared by KOH activation forms a molten mixture with biomass due to the fact that KOH can be melted at a higher temperature, certain components in the loofah sponge can be combined with the KOH to form potassium salt, and when the temperature is further increased, gas can escape from the molten mixture, so that the mixture expands, and irregular porosity is formed. In addition, potassium vapor can insert into the carbon layer at high temperature, so that the lattice of the carbon skeleton is unbalanced, and the disorder of the carbon layer is further increased. The step of acid washing after pyrolysis removes potassium salt generated in the preparation process, and can dredge the porous structure blocked by the potassium salt to a certain extent, so that the specific surface area is increased, and finally, the obtained porous structure is high in surface roughness, has holes similar to worm etching shapes and is different in size, and carbon walls are communicated with one another to form an irregular 3D frame structure, so that the specific surface area is greatly increased, and the adsorption effect of the biochar is improved;
(2) Loading a layer of excessive alkali metal oxide to the pores and the surface of the biochar by an immersion calcining method to obtain modified biochar, and promoting hydroxyl free radicals generated by subsequent catalysis by the excessive alkali metal oxide so as to increase the oxidative decomposition capacity of a complexing agent in the electroplating wastewater;
(3) Nanometer titanium dioxide particles are loaded in pores and surfaces of the modified biochar through a sol-gel method, the specific surface area of the surface of the modified biochar is increased due to the generation of the nanometer titanium dioxide particles on the surface layer, the adsorption performance of the modified biochar is improved, in addition, pyruvic acid is used as an electron receptor and can easily receive photo-generated electrons generated by titanium dioxide, so that the compounding of the photo-generated electrons and holes is effectively inhibited, the concentration of hydroxyl radicals in electroplating wastewater is improved, heavy metal ions in the electroplating wastewater are formed by coordination of coordination bonds and other complexing organic matters, the coordination bonds are oxidized by the hydroxyl radicals with super-strong oxidizing performance, so that the coordination bonds are broken, divalent copper ions and divalent nickel ions which originally have complexing states are freely introduced into a solution and are removed through alkali precipitation, and the complex complexing organic matters are finally oxidized by the hydroxyl radicals into micromolecular acid organic matters, carbon dioxide, water and the like;
in addition, the strontium and magnesium oxide loaded in the modified biochar can distort titanium dioxide crystal lattices, narrow the energy gap of a forbidden band of the titanium dioxide and generate red shift, so that the titanium dioxide can absorb light with a wider-range wavelength, and in addition, strontium ions can absorb light energy with higher energy and transfer the light energy to the titanium dioxide to help the titanium dioxide to absorb the light energy, so that the titanium dioxide has stronger oxidative degradation capability under visible light, and the treatment effect on electroplating wastewater is further improved.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a clear understanding of the technical features of the present invention.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
(1) Weighing loofah sponge, placing the loofah sponge outdoors, airing, placing the loofah sponge in an oven, drying for 24h at 105-110 ℃, crushing and sieving with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, heating to 380 ℃ for pyrolysis for 90min, heating to 780 ℃ for pyrolysis for 2h, cooling to room temperature after pyrolysis is finished, and washing with hydrochloric acid and deionized water for 3 times respectively to obtain activated charcoal; the biomass loofah sponge is used as the original material, the components of the loofah sponge are complex, organic matters are dehydrated and condensed to form aromatic compounds in the pyrolysis process, and then carbon skeletons are formed, and the graphitization temperature can not be reached at the pyrolysis temperature of 380-780 ℃, so that the biochar produced by pyrolysis mainly takes amorphous carbon as the main component, and a large amount of oxygen-containing functional groups are reserved. And the increase of the number of the oxygen-containing functional groups can improve the capture capacity of the material to the pollutants, and correspondingly improve the adsorption performance of the material. The oxygen-containing functional group can promote the transfer of electrons, improve the concentration of subsequent hydroxyl radicals and increase the oxidative decomposition capacity of a complexing agent; the biomass charcoal prepared by KOH activation forms a molten mixture with biomass due to the fact that KOH can be melted at a higher temperature, certain components in the loofah sponge can be combined with the KOH to form potassium salt, and when the temperature is further increased, gas can escape from the molten mixture, so that the mixture expands, and irregular porosity is formed. In addition, potassium vapor can insert into the carbon layer at high temperature, so that the lattice of the carbon skeleton is unbalanced, and the disorder of the carbon layer is further increased. The acid washing step after pyrolysis can remove potassium salt generated in the preparation process, can dredge the porous structure blocked by the potassium salt to a certain extent, further increase the specific surface area, finally obtain the holes which have high surface roughness and are similar to worm etching shapes, and the carbon walls are communicated with each other, so that an irregular 3D frame structure is formed, the specific surface area is greatly improved, and the adsorption effect of the biochar is improved.
(2) Mixing the activated charcoal, strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10; loading a layer of excessive alkali metal oxide to the pores and the surface of the biochar by a dipping and calcining method to obtain modified biochar, and promoting hydroxyl free radicals generated by subsequent catalysis by the excessive alkali metal oxide so as to increase the oxidative decomposition capacity of a complexing agent in the electroplating wastewater;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10 to 1, putting the mixture into an ultrasonic oscillator, ultrasonically oscillating and dispersing the mixture at a frequency of 30-40 kHz, putting the dispersion into a conical flask with a stirrer, dripping tetrabutyl titanate with the mass of 50 percent of the absolute ethyl alcohol into the conical flask by using a dropping funnel, and stirring and mixing the mixture for 10-15 min by using the stirrer at a rotating speed of 200-300 r/min to obtain a precursor;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 1-2 h, filtering and separating to obtain filter residue, standing and aging for 2-3 days, putting into a muffle furnace, calcining for 1-2 h at 180-200 ℃, and discharging to obtain the electroplating wastewater treatment agent; nanometer titanium dioxide particles are loaded in pores and surfaces of the modified biochar through a sol-gel method, the specific surface area of the surface of the modified biochar is increased due to the generation of the nanometer titanium dioxide particles on the surface layer, the adsorption performance of the modified biochar is improved, in addition, pyruvic acid is used as an electron receptor and is easy to receive photoproduction electrons generated by titanium dioxide, so that the recombination of the photoproduction electrons and the holes is effectively inhibited, the concentration of hydroxyl radicals in electroplating wastewater is improved, heavy metal ions in the electroplating wastewater are formed by coordination of coordination bonds and other complexing organic matters, the coordination bonds are oxidized by the hydroxyl radicals with super-strong oxidizing performance, so that the coordination bonds are broken, bivalent copper ions and bivalent nickel ions which originally have complexing states are freely introduced into a solution and then are removed as precipitation substances through alkali precipitation, and the complex complexing organic matters are finally oxidized into micromolecular acid organic matters, carbon dioxide, water and the like by the hydroxyl radicals;
in addition, the strontium and magnesium oxide loaded in the modified biochar can distort titanium dioxide crystal lattices, narrow the energy gap of a forbidden band of the titanium dioxide and generate red shift, so that the titanium dioxide can absorb light with a wider-range wavelength, and in addition, strontium ions can absorb light energy with higher energy and transfer the light energy to the titanium dioxide to help the titanium dioxide to absorb the light energy, so that the titanium dioxide has stronger oxidative degradation capability under visible light, and the treatment effect on electroplating wastewater is further improved.
The application method of the electroplating wastewater treatment agent in the technical scheme comprises the following steps:
the electroplating wastewater treatment agent is added into electroplating wastewater to be treated and containing complexing agent according to the adding amount of 3-5 g/L, and the illumination intensity of 5.0mW/cm is applied to the surface of the electroplating wastewater 2 The xenon lamp light source is stirred and reacted for 2 to 3 hours at the temperature of between 25 and 30 ℃ by a stirrer at the rotating speed of between 150 and 200r/min, after the reaction is finished, the pH value is adjusted to 8 by sodium hydroxide, after standing and layering, a centrifuge is used for centrifugal treatment at the rotating speed of 4000r/min for 20 minutes, then the lower-layer sediment is removed, and the upper-layer liquid is the treated electroplating wastewater.
Example 1
(1) Weighing loofah sponge, placing the loofah sponge in an outdoor place, airing the loofah sponge in the outdoor place, placing the loofah sponge in an oven, drying the loofah sponge for 24 hours at 105 ℃, crushing the loofah sponge, sieving the loofah sponge with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, heating the mixture to 380 ℃ for pyrolysis for 90 minutes, heating the mixture to 780 ℃ for pyrolysis for 2 hours, cooling the mixture to room temperature after the pyrolysis is finished, and washing the mixture for 3 times with hydrochloric acid and deionized water respectively to obtain activated charcoal;
(2) Mixing the activated charcoal, strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 1h, filtering and separating to obtain filter residue, standing and aging for 2 days, putting into a muffle furnace, calcining for 1h at 180 ℃, and discharging to obtain the electroplating wastewater treatment agent.
Example 2
(1) Weighing loofah sponge, placing the loofah sponge outdoors, airing, placing the loofah sponge in an oven, drying for 24h at 108 ℃, crushing and sieving with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, heating to 380 ℃ for pyrolysis for 90min, heating to 780 ℃ for pyrolysis for 2h, cooling to room temperature after pyrolysis is finished, and washing with hydrochloric acid and deionized water for 3 times respectively to obtain activated charcoal;
(2) Mixing the activated charcoal, strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10 to 1, then placing the mixture into an ultrasonic oscillator, carrying out ultrasonic oscillation dispersion at a frequency of 35kHz, placing the dispersion into a conical flask with a stirrer, dripping tetrabutyl titanate accounting for 50% of the mass of the absolute ethyl alcohol into the conical flask by using a dropping funnel, and stirring and mixing the mixture for 13min at a rotating speed of 250r/min by using the stirrer to obtain a precursor;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 1h, filtering and separating to obtain filter residue, standing and aging for 2 days, putting into a muffle furnace, calcining for 1h at 190 ℃, and discharging to obtain the electroplating wastewater treatment agent.
Example 3
(1) Weighing loofah sponge, placing the loofah sponge outdoors, airing and placing the loofah sponge into an oven, drying the loofah sponge for 24 hours at 110 ℃, crushing the loofah sponge and sieving the loofah sponge with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, heating to 380 ℃ for pyrolysis for 90 minutes, heating to 780 ℃ for pyrolysis for 2 hours, cooling to room temperature after the pyrolysis is finished, and washing with hydrochloric acid and deionized water for 3 times respectively to obtain activated charcoal;
(2) Mixing the activated charcoal, strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10 to 1, then placing the mixture into an ultrasonic oscillator, carrying out ultrasonic oscillation dispersion at a frequency of 40kHz, placing dispersion liquid into a conical flask with a stirrer, dripping tetrabutyl titanate with the mass being 50% of that of the absolute ethyl alcohol into the conical flask by using a dropping funnel, and stirring and mixing the mixture for 15min at a rotating speed of 300r/min by using the stirrer to obtain a precursor;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 2h, filtering and separating to obtain filter residue, standing and aging for 3 days, putting into a muffle furnace, calcining for 2h at 200 ℃, and discharging to obtain the electroplating wastewater treatment agent.
Example 4
Example 4 the same procedure as in example 1 was repeated except that the biochar was not activated with potassium hydroxide to prepare a treating agent for electroplating wastewater;
example 5
Example 5 is substantially the same as example 1 in preparation steps, except that the activated biochar is prepared without modifying the activated biochar in metal ion attachment, and an electroplating wastewater treatment agent is also prepared;
example 6
Example 6 and example 1 have substantially the same preparation steps, the only difference is that titanium dioxide is not loaded on the surface of the modified biochar, and the modified biochar is directly used as an electroplating wastewater treatment agent;
comparative example 1
Treating the electroplating wastewater by combining a conventional Fenton oxidation method with sodium hydroxide precipitation: adding ferrous sulfate into electroplating wastewater to be treated, adjusting the pH value to 3 by using a sulfuric acid solution, adding hydrogen peroxide into the wastewater by using a pipette, controlling the molar ratio of ferrous ions to the hydrogen peroxide to be 0.2, reacting for 60min, stirring, adding sodium hydroxide to adjust the pH value to 10, precipitating, filtering to remove filter residues, and obtaining filtrate, namely the treated wastewater.
Performance test
The detection method comprises the following steps: adding the electroplating wastewater treating agent into electroplating wastewater to be treated and containing complexing agent according to the adding amount of 3-5 g/L, and applying illumination intensity of 5.0mW/cm on the surface of the electroplating wastewater 2 The xenon lamp light source is stirred and reacted for 2 to 3 hours at the temperature of between 25 and 30 ℃ by a stirrer at the rotating speed of between 150 and 200r/min, after the reaction is finished, the pH value is adjusted to 8 by sodium hydroxide, after standing and layering, a centrifuge is used for centrifugal treatment at the rotating speed of 4000r/min for 20 minutes, then the lower-layer sediment is removed, and the upper-layer liquid is the treated electroplating wastewater.
The concentration of main pollutants of the electroplating wastewater containing the complexing agent to be treated is as follows:
the pH value is 6.5, the COD is 1550.1mg/L, the total suspended particulate matter is 1.92g/L, the total nickel is 550.60mg/L, and the total copper is 26.28mg/L;
and finally, detecting the concentration of each main pollutant in the treated electroplating wastewater, wherein the specific detection result is shown in table 1:
as can be seen from the detection data in the above table, the removal effect of the main pollutants in the original electroplating wastewater in examples 1 to 3 is excellent and reaches the national wastewater discharge standard, and then the detection results of example 4 and example 1 are compared, and example 4 finally has a poor removal effect on the main pollutants in the electroplating wastewater due to the fact that the biochar is not activated by potassium hydroxide, which laterally confirms that the biomass carbon prepared by KOH activation forms a molten mixture with the biomass due to the fact that KOH melts at a higher temperature, and certain components in the loofah sponge combine with KOH to form potassium salt, and when the temperature is further increased, the molten mixture escapes to cause the expansion of the mixture, thereby forming irregular porosity. In addition, potassium vapor can insert into the carbon layer at high temperature, so that the lattice of the carbon skeleton is unbalanced, and the disorder of the carbon layer is further increased. The acid washing step after pyrolysis can remove potassium salt generated in the preparation process, can dredge the porous structure blocked by the potassium salt to a certain extent, further increase the specific surface area, finally obtain the holes which have high surface roughness and are similar to worm etching shapes, and the carbon walls are communicated with each other, so that an irregular 3D frame structure is formed, the specific surface area is greatly improved, and the adsorption effect of the biochar is improved.
Comparing the detection results of example 5 and example 1, since the activated charcoal prepared in example 5 is not modified by metal ion attachment, the final removal effect of the main pollutants in the electroplating wastewater is reduced, and is worse than that of example 4, it can be confirmed that a layer of excessive alkali metal oxide is loaded on the pores and the surface of the charcoal by the impregnation calcination method to obtain modified charcoal, and the excessive alkali metal oxide promotes the hydroxyl radical generated by the subsequent catalysis, thereby increasing the oxidative decomposition capability of the complexing agent in the electroplating wastewater;
comparing the detection results of the embodiment 6 and the embodiment 1, as the embodiment 6 does not load titanium dioxide on the surface of the modified biochar, the modified biochar is directly used as the electroplating wastewater treatment agent, so that the final treatment effect on the electroplating wastewater is obviously reduced, thereby proving that nano titanium dioxide particles are loaded on the pores and the surface of the modified biochar by the sol-gel method, the generation of the nano titanium dioxide particles on the surface layer increases the specific surface area of the surface of the modified biochar, the adsorption performance of the modified biochar is improved, in addition, pyruvic acid is used as an electron acceptor, photo-generated electrons generated by the titanium dioxide are easily received, the recombination of the photo-generated electrons and cavities is effectively inhibited, the concentration of hydroxyl radicals in the electroplating wastewater is improved, heavy metal ions in the electroplating wastewater are composed of coordination bonds with other complex organic matters through coordination bonds, the coordination bonds are oxidized by the hydroxyl radicals with super oxidative performance, the coordination bonds are broken, divalent copper ions and divalent nickel ions which originally have complex states are freely entered into the solution, and then are removed as precipitation matters through alkali precipitation, and the complex organic matters are finally oxidized into small molecules such as organic matters, carbon dioxide, water and the hydroxyl radicals;
in addition, strontium and magnesium oxides loaded in the modified biochar can distort titanium dioxide crystal lattices, so that forbidden band energy gaps of the titanium dioxide are narrowed, red shift is generated, the titanium dioxide can absorb light with a wider-range wavelength, and strontium ions can absorb light energy with higher energy and transfer the light energy to the titanium dioxide to help the titanium dioxide to absorb the light energy, so that the titanium dioxide shows stronger oxidative degradation capability under visible light, and the treatment effect on electroplating wastewater is further improved.
Finally, the performances of the comparative example 1 and the example 1 are compared, the comparative example 1 adopts the traditional Fenton oxidation and alkali precipitation means, and the treatment effect of the conventional Fenton oxidation and alkali precipitation means on the electroplating wastewater is obviously lower than that of the example 1, which proves that the technical scheme of the application is feasible and the treatment effect is excellent.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. An electroplating wastewater treatment agent is characterized in that: comprises an activated charcoal matrix and a metal oxide layer attached to the surface of the activated charcoal matrix;
the activated charcoal matrix preparation raw materials comprise loofah sponge powder and potassium hydroxide;
the raw materials for preparing the metal oxide layer comprise strontium nitrate, magnesium nitrate and water.
2. The treating agent for an electroplating wastewater according to claim 1, wherein: a strong catalytic layer is also fixed on the surface of the metal oxide layer;
the preparation raw materials of the strong catalytic layer comprise absolute ethyl alcohol, tetrabutyl titanate, glacial acetic acid and pyruvic acid.
3. A preparation method of an electroplating wastewater treating agent is characterized by comprising the following specific preparation steps:
(1) Weighing loofah sponge, placing the loofah sponge in an outdoor place, airing the loofah sponge, placing the loofah sponge in an oven, drying the loofah sponge for 24 hours at 105-110 ℃, crushing the loofah sponge, sieving the loofah sponge with a 80-mesh sieve to obtain loofah sponge powder, mixing the loofah sponge powder and potassium hydroxide according to the equal mass ratio, placing the mixture into a vacuum tube furnace, melting nitrogen to remove all air, pyrolyzing, cooling to room temperature after pyrolysis is finished, and washing with hydrochloric acid and deionized water for 3 times respectively to obtain activated charcoal;
(2) Mixing the activated charcoal, strontium nitrate, magnesium nitrate and deionized water according to a mass ratio of 10;
(3) Mixing absolute ethyl alcohol and the modified biochar according to a mass ratio of 10 to 1, putting the mixture into an ultrasonic oscillator, ultrasonically oscillating and dispersing the mixture at a frequency of 30-40 kHz, putting the dispersion into a conical flask with a stirrer, dripping tetrabutyl titanate with the mass of 50 percent of the absolute ethyl alcohol into the conical flask by using a dropping funnel, and stirring and mixing the mixture for 10-15 min by using the stirrer at a rotating speed of 200-300 r/min to obtain a precursor;
(4) Adding glacial acetic acid accounting for 30% of the volume of the precursor and pyruvic acid accounting for 10% of the mass of the precursor into the precursor, stirring and mixing for 1-2 h, filtering and separating to obtain filter residue, standing and aging for 2-3 days, putting into a muffle furnace, calcining at 180-200 ℃ for 1-2 h, and discharging to obtain the electroplating wastewater treatment agent.
4. The method for producing an electroplating wastewater treatment agent according to claim 3, characterized in that: the step of pyrolysis in the step (1) is to heat to 380 ℃ for 90min, and then heat to 780 ℃ for 2h.
5. The use of an electroplating wastewater treatment agent according to claim 1, wherein: is used for treating electroplating wastewater containing complexing agent.
6. The use of the treating agent for electroplating wastewater according to claim 5, wherein: the specific application steps are as follows:
adding the electroplating wastewater treatment agent into electroplating wastewater to be treated and containing complexing agent according to the adding amount of 3-5 g/L, and applying illumination intensity of 5.0mW/cm on the surface of the electroplating wastewater 2 The xenon lamp light source is stirred and reacted for 2 to 3 hours at the temperature of between 25 and 30 ℃ by a stirrer at the rotating speed of between 150 and 200r/min, after the reaction is finished, the pH value is adjusted to 8 by sodium hydroxide, after standing and layering, a centrifuge is used for centrifugal treatment at the rotating speed of 4000r/min for 20 minutes, then the lower-layer sediment is removed, and the upper-layer liquid is the treated electroplating wastewater.
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