CN114797871A - Preparation of calcium-iron composite catalyst for degrading pollutants in electroplating wastewater - Google Patents
Preparation of calcium-iron composite catalyst for degrading pollutants in electroplating wastewater Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 42
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000009713 electroplating Methods 0.000 title claims abstract description 25
- 239000002351 wastewater Substances 0.000 title claims abstract description 24
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 23
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 230000000593 degrading effect Effects 0.000 title claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002244 precipitate Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000012153 distilled water Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 10
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 6
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 4
- 239000010935 stainless steel Substances 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims description 10
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 claims description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 238000006731 degradation reaction Methods 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 229910014460 Ca-Fe Inorganic materials 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- HNDVDQJCIGZPNO-YFKPBYRVSA-N L-histidine Chemical compound OC(=O)[C@@H](N)CC1=CN=CN1 HNDVDQJCIGZPNO-YFKPBYRVSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000004699 copper complex Chemical class 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- RHVUIKVRBXDJSX-ZLELNMGESA-N (2s)-2-azanyl-3-(1h-imidazol-5-yl)propanoic acid Chemical compound OC(=O)[C@@H](N)CC1=CNC=N1.OC(=O)[C@@H](N)CC1=CNC=N1 RHVUIKVRBXDJSX-ZLELNMGESA-N 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 229910017135 Fe—O Inorganic materials 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229960002885 histidine Drugs 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002073 nanorod Substances 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a preparation method of a calcium-iron composite catalyst for degrading pollutants in electroplating wastewater, which comprises the following steps: adding Ca salt into distilled water, stirring to obtain a solution A, then adding Fe salt into the solution A to obtain a solution B, adding NaOH solution into the solution B in the stirring process, and continuously stirring to obtain a solution C; transferring the solution C into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out hydrothermal reaction to obtain a precipitate D; washing the precipitate D with distilled water and anhydrous alcohol solution for multiple times to obtain precipitate E; putting the precipitate E into a vacuum drying oven for constant-temperature drying to obtain a dry solid F; and grinding the solid F into powder to obtain the calcium-iron composite catalyst. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater, which adopts the structure, is low in cost, simple in preparation method and strong in catalytic degradation effect and adsorption capacity.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a preparation method of a calcium-iron composite catalyst for degrading pollutants in electroplating wastewater.
Background
In recent years, with the rapid development of industrial technology, the electroplating industry gradually becomes one of the important industrial and economic fields in China, thereby bringing about a plurality of environmental pollution problems and causing serious threats to human health and ecosystem. At present, the removal of complex metal in electroplating wastewater is a great problem, and the complete removal of organic ligand and the efficient recovery of heavy metal are difficult to be carried out synchronously. The hypochlorous acid oxidation technology is applied to the field of wastewater treatment, the existing catalyst for catalyzing the decomposition of the hypochlorous acid oxidation technology can improve the decomposition rate of the hypochlorous acid oxidation technology, but the hypochlorous acid oxidation technology is not ideal for removing complex metal. Therefore, a new catalyst formula is urgently needed to apply the hypochlorous acid oxidation technology to the removal of complex heavy metals.
Disclosure of Invention
The invention aims to provide a preparation method of a calcium-iron composite catalyst for degrading pollutants in electroplating wastewater, and aims to solve the problem of poor catalytic oxidation effect when the hypochlorous acid oxidation technology is applied to removal of complex-state metals in the electroplating wastewater.
In order to achieve the aim, the invention provides a preparation method of a calcium-iron composite catalyst for degrading pollutants in electroplating wastewater, which comprises the following steps:
(1) adding Ca salt into distilled water, stirring to obtain a solution A, then adding Fe salt into the solution A to obtain a solution B, adding NaOH solution into the solution B in the stirring process, and continuously stirring to obtain a solution C;
(2) transferring the solution C obtained in the step (1) into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out hydrothermal reaction to obtain a precipitate D;
(3) washing the precipitate D obtained in the step (2) with distilled water and anhydrous alcohol solution for multiple times to obtain a precipitate E;
(4) putting the precipitate E obtained in the step (3) into a vacuum drying oven for constant-temperature drying to obtain a dry solid F;
(5) grinding the solid F obtained in the step (4) into powder to obtain the calcium-iron composite catalyst.
Preferably, the mass ratio of the Ca salt to the distilled water in the step (1) is 1: 10-100, and the mass ratio of the Fe salt to the distilled water is 1: 10-100.
Preferably, the Ca salt is one or more of calcium nitrate, calcium hypochlorite and calcium carbonate.
Preferably, the Fe salt is one or more of ferric chloride, ferric sulfate and ferric nitrate.
Preferably, the molar ratio of the calcium element to the iron element is 0.10-5.00.
Preferably, the stirring step in the step (1) is magnetic stirring, and the continuous stirring time is 1-3 h.
Preferably, the hydrothermal reaction temperature in the step (2) is 100-180 ℃, and the hydrothermal reaction time is 5-30 h.
Preferably, in the washing step in the step (3), the precipitate is washed by using a high-speed centrifuge, and the rotating speed is 5000-15000 r/min.
Preferably, the absolute alcohol solution in step (3) is at least one of absolute ethanol, absolute propanol, absolute butanol or absolute pentanol.
Preferably, the temperature of the vacuum drying step in the step (4) is 50-100 ℃, and the drying time is 10-30 h.
Therefore, the preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater by adopting the structure has the following beneficial effects:
(1) the calcium element is doped into the iron material to form the calcium-iron composite catalyst, then the hypochlorous acid oxidation technology is applied to removing the complex heavy metals in the electroplating wastewater, different calcium-iron composite catalysts can be prepared by changing the doping amount of the calcium element, different calcium-iron composite catalysts have different effects of degrading the complex heavy metals, and when the molar ratio of calcium to iron is 2.50, the catalytic degradation effect of the calcium-iron composite catalysts is better.
(2) The calcium-iron composite catalyst has the advantages of low cost, simple preparation method, lower requirement on equipment, good operability, stable material structure in a hypochlorous acid oxidation system, no iron ion plasma leaching, and strong adsorption capacity of the material to pollutants independently.
(3) The calcium-iron composite catalyst has magnetism, and is beneficial to the recovery and the reutilization of subsequent materials.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of the preparation of the calcium-iron composite catalyst of the present invention;
FIG. 2 is an SEM image of the calcium-iron composite catalyst of the present invention at 1 μm;
FIG. 3 is an SEM image of the calcium-iron composite catalyst of the invention at 100 nm;
FIG. 4 is an infrared spectrum of a Ca-Fe composite catalyst of the present invention;
FIG. 5 shows the adsorption removal rate and catalytic oxidation removal rate of the Ca-Fe composite catalyst of the present invention for pollutants at different pH values;
FIG. 6 shows the effect of the Ca-Fe composite catalyst on the degradation of pollutants at different Ca-Fe molar ratios;
FIG. 7 is a graph showing the results of radical screening of the calcium-iron composite catalyst of the present invention;
fig. 8 is a free radical EPR test profile of the calcium iron composite catalyst of the present invention.
Detailed Description
The present invention will be further described below, and it should be noted that the present embodiment is based on the technical solution, and a detailed implementation manner and a specific operation process are provided, but the present invention is not limited to the present embodiment.
Example 1
(1) Adding calcium nitrate into distilled water, stirring to obtain a solution A, then adding ferric nitrate into the solution A to obtain a solution B, wherein the mass fraction of calcium in the solution A is 5 wt%, the molar ratio of calcium element to iron element is 2.50, adding a NaOH solution into the solution B in the stirring process, and continuously stirring for 3 hours to obtain a solution C, wherein the solution C is a uniform suspension;
(2) transferring the solution C obtained in the step (1) into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, sealing, and carrying out hydrothermal reaction at 120 ℃ for 12 hours to obtain a precipitate D;
(3) washing the precipitate D obtained in the step (2) with distilled water and absolute ethyl alcohol for multiple times, and centrifuging and collecting the precipitate E at 10000 r/min;
(4) putting the precipitate E obtained in the step (3) into a vacuum drying oven, drying at a constant temperature of 60 ℃ for 12 hours to obtain a dried solid F, wherein the color of the dried solid F is a yellow-brown solid;
(5) grinding the solid F obtained in the step (4) into powder to obtain the calcium-iron composite catalyst.
Example 2
Example 2 is different from example 1 in that the molar ratios of the calcium element to the iron element are 0.50, 1.00, 1.50, 2.00, and 3.00, respectively.
The calcium-iron composite catalyst prepared in example 1 was subjected to various tests. It can be seen from the electron micrographs of fig. 2 and fig. 3 that the prepared calcium-iron composite catalyst is in a nano rod shape, the rod diameter is uniform, the diameter is between 20 nm and 50nm, the length is different, and the boundary between particles is obvious. 890cm can be seen from the infrared spectrum of FIG. 4 -1 、790cm -1 、608cm -1 The characteristic peaks of the iron compounds are generated by stretching vibration of Fe-O-H, Fe-O bonds respectively; 1402cm -1 、1658cm -1 The nearby absorption peak is H-O-H deformation vibration peak; 3110cm -1 The absorption peak appearing nearby is a stretching vibration peak of-OH.
The calcium-iron composite catalyst prepared in the example 1 is applied to removal of complex heavy metals in electroplating wastewater, wherein the dosage of the catalyst is 0.5g/L, and the copper complex (Cu is used for complexing copper) is used for replacing the electroplating wastewater to carry out experiments 2+ Calculated) is 50mg/L, and fig. 5 shows the adsorption effect and catalytic oxidation removal effect of the calcium-iron catalyst on the complex copper under different pH values, and it can be seen from the figure that the adsorption removal effect of the catalyst with the pH value of 5-11 is better, and the oxidation removal effect of the catalyst with the pH value of 3-11 is better.
The catalysts prepared in example 1 and example 2 are applied to the removal of complex copper, and the degradation effect of the catalysts prepared in different molar ratios of calcium to iron can be seen from fig. 6, wherein when the molar ratio of calcium to iron is 2.50, the prepared calcium-iron composite catalyst has better effect of degrading and removing the complex copper, and the removal rate of the complex copper is close to 100% within one hour.
Example 1 was applied to the copper complex removal experiment, and the same concentration of shielding agent was added to the solution before the degradation experiment, wherein the shielding agent was ascorbic acid (ROS spectrum shielding agent), L-histidine (L-histidine) 1 O 2 FIG. 7 shows that when L-histidine is added during the degradation experiment, the degradation of the complex copper is obviously inhibited, while the other shielding agents do not generate obvious influence, so that the shielding agents are used for shielding copper ions and methanol (OH shielding agents) and tert-butyl alcohol (OH and Cl shielding agents), and therefore 1 O 2 Is the main active substance in the experimental system.
The EPR test was performed using the calcium iron composite catalyst prepared in example 1, and the test results are shown in fig. 8, and it can be seen from fig. 8 that 1: 1:1 characteristic peak, whereas with TEMPO trap a large number of 1: 1:1 peak of signal, description 1 O 2 The active substances in the experimental system are consistent with the shielding experimental results.
Therefore, the preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater with the structure has the advantages of low cost, simple preparation method, lower requirement on equipment, good operability, stable material structure in a hypochlorous acid oxidation system, no iron ion plasma leaching and strong adsorption capacity of the material on the pollutants independently.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (10)
1. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater is characterized by comprising the following steps of: the method comprises the following steps:
(1) adding Ca salt into distilled water, stirring to obtain a solution A, then adding Fe salt into the solution A to obtain a solution B, adding NaOH solution into the solution B in the stirring process, and continuously stirring to obtain a solution C;
(2) transferring the solution C obtained in the step (1) into a stainless steel high-pressure reaction kettle with a polytetrafluoroethylene lining, and carrying out hydrothermal reaction to obtain a precipitate D;
(3) washing the precipitate D obtained in the step (2) with distilled water and anhydrous alcohol solution for multiple times to obtain a precipitate E;
(4) putting the precipitate E obtained in the step (3) into a vacuum drying oven for constant-temperature drying to obtain a dry solid F;
(5) grinding the solid F obtained in the step (4) into powder to obtain the calcium-iron composite catalyst.
2. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: in the step (1), the mass ratio of the Ca salt to the distilled water is 1: 10-100, and the mass ratio of the Fe salt to the distilled water is 1: 10-100.
3. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the Ca salt is one or more of calcium nitrate, calcium hypochlorite and calcium carbonate.
4. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the Fe salt is one or more of ferric chloride, ferric sulfate and ferric nitrate.
5. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the molar ratio of the calcium element to the iron element is 0.10-5.00.
6. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the stirring step in the step (1) is magnetic stirring, and the continuous stirring time is 1-3 h.
7. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the hydrothermal reaction temperature in the step (2) is 100-180 ℃, and the hydrothermal reaction time is 5-30 h.
8. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which comprises the following steps: in the washing step in the step (3), a high-speed centrifuge is used for washing the precipitate, and the rotating speed is 5000-15000 r/min.
9. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the absolute alcohol solution in the step (3) is at least one of absolute ethyl alcohol, absolute propyl alcohol, absolute butyl alcohol or absolute amyl alcohol.
10. The preparation method of the calcium-iron composite catalyst for degrading pollutants in electroplating wastewater according to claim 1, which is characterized by comprising the following steps of: the temperature of the vacuum drying step in the step (4) is 50-100 ℃, and the drying time is 10-30 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115738999A (en) * | 2022-12-08 | 2023-03-07 | 中国科学院合肥物质科学研究院 | Calcium ferrate nanosphere material as well as preparation method and application thereof |
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|---|---|---|---|---|
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