CN109292951B - By using MnOX/Fe0Method for treating organic wastewater by activating persulfate through nano composite material - Google Patents

By using MnOX/Fe0Method for treating organic wastewater by activating persulfate through nano composite material Download PDF

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CN109292951B
CN109292951B CN201811093664.1A CN201811093664A CN109292951B CN 109292951 B CN109292951 B CN 109292951B CN 201811093664 A CN201811093664 A CN 201811093664A CN 109292951 B CN109292951 B CN 109292951B
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organic wastewater
persulfate
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CN109292951A (en
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鲍腾
俞志敏
邓呈逊
卫新来
张勇
路思恒
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Hefei University
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    • 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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • C02F1/705—Reduction by 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
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C02F2101/345—Phenols

Abstract

The invention provides a method for utilizing MnOX/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate comprises the following steps: crushing natural manganese ore and calcining to obtain MnO containing active ingredientxThe iron salt and the active ingredient MnOxThe mineral powder is fully mixed, and then a reducing agent is added for reduction reaction to obtain MnOX/Fe0A nanocomposite; MnO to be obtainedX/Fe0Adding the nano composite material and persulfate into the organic wastewater, and treating the organic wastewater under the stirring condition. The invention provides a method for utilizing MnOX/Fe0The method for treating organic wastewater by activating persulfate through the nano composite material can be used for specifically catalyzing and degrading various organic matters in the organic wastewater, so that the method has the advantages of high purification efficiency, simple process, easiness in operation, few types of required reagents and low cost.

Description

By using MnOX/Fe0Method for treating organic wastewater by activating persulfate through nano composite material
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for utilizing MnOX/Fe0A method for treating organic wastewater by activating persulfate through a nano composite material.
Background
With the rapid development of the industry, the application of organic products is continuously increased, the number and the types of organic pollutants are increased year by year, and the problem of pollution of a large amount of organic matters exists in water bodies and air. For example, with the increasing development of the chemical industry, a large amount of toxic and harmful organic pollutants are discharged into rivers, wherein the dye wastewater contains refractory organic pollutants, is one of typical refractory industrial wastewater, and has the characteristics of high COD, high chroma, complex components, high toxicity, poor biodegradability and the like. The traditional water pollution treatment technology, such as an adsorption method, a flocculation precipitation method, a microbiological method and the like, is difficult to adapt to the treatment of novel dye wastewater. Therefore, the need for a better water treatment technology capable of efficiently treating the organic dye wastewater difficult to degrade is urgently needed.
In recent years, the advanced oxidation technology using sulfate radical as the main active species has attracted more and more attention of researchers. Based on SO4 -The advanced oxidation technique of (2) has the following advantages; (1) the oxidant is solid particles, and the stability is far greater than that of H2O2And O3Is not easy to inactivate; (2) activation of the oxidant to produce SO4 -The pH influence is small, and the method can adapt to waste water with different pH values. (3) SO (SO)4 -The lifetime (half-life 4S) of the system is much longer than that of OH (half-life less than 1 microsecond), which can greatly improve the degradation efficiency of organic pollutants. Currently generating SO4 -The technique of (1) is mainly to activate persulfate, and the modes of activating persulfate mainly comprise ultraviolet light activation, thermal activation and transition metal activation. The transition metal/PMS system is widely researched and applied due to the advantages of high activation efficiency, strong oxidation capability, wide application range and the like. For many transition metals, among them Co2+Activated PMS was most efficient, but Co2+the/PMS system has some disadvantages, such as: the catalyst is not easy to be recovered and is easy to cause secondary pollution. To overcome Co2+The defects of the/PMS system, a heterogeneous Co/PMS system is developed, namely Co is loaded on other carriers or is synthesized with other substances to form a nano composite material to activate PMS, but the leaching of Co cannot be avoided, and the heterogeneous Co/PMS system has potential harm. Therefore, it is important to find a green catalyst which is pollution-free, high in catalytic activity and long in service life.
The nanoscale zero-valent iron refers to ultrafine iron particles with the particle size of l-100nm, and has the characteristics of strong reducibility, high specific surface area and the like. Synthesis by researchersThe surface analysis of the nanoscale zero-valent iron shows that the specific surface area of the nanoscale zero-valent iron is more than 37 times that of the common iron powder, so that the nanoscale zero-valent iron has excellent adsorption performance and chemical reaction activity. In addition, the nano zero-valent iron has small size and surface effect, and can improve the reaction activity and the treatment efficiency. Because of these new properties, the research of nanoscale zero-valent iron has become a leading-edge hotspot for the disputed research of researchers today. Natural manganese ore, namely manganese oxide mineral, is used as a natural pollution treatment material, and the active ingredients of the natural manganese ore comprise MnO and MnO2、Mn2O3And Mn3O4Etc., and the structure is usually [ MnO ]6]Octahedra of this kind [ MnO ]6]The octahedrons can be mutually connected in a mode of sharing edges or angles, and the whole body formed by connection can form a tunnel-shaped or layered manganese oxide crystalline compound, so that the octahedrons have stronger adsorption and catalytic oxidation effects under certain conditions, and the removal and degradation of toxic and harmful substances are mainly based on the following properties: the manganese oxide minerals are generally micron-sized or nano-sized particles, have pore channels or a layered structure, have larger specific surface areas on the inner and outer surfaces of the particles, and have the adsorption action mainly on the outer surfaces of the minerals and the mineral structure. Manganese in nature exhibits a strong redox ability, which is greatly related to external conditions, and also depends on the redox potential of the reaction substance, and the redox action includes surface redox and redox in the structure. The manganese oxide mineral has a large specific surface area and has a good catalytic effect on a plurality of reactions, meanwhile, the manganese oxide mineral can adsorb some catalysts into pore channels to be used as a carrier of the catalysts, and Mn-O free radicals on the surface of natural manganese ores also have a great catalytic effect on some chemical reactions.
MnO in prior art2the/PMS catalytic reaction system has high catalytic activity but has MnO2The recovery of the/PMS is difficult and cannot be magnetically recovered. The nanoscale zero-valent iron has the characteristics of strong reducibility, high specific surface area and the like, but the nanoscale zero-valent iron is easy to agglomerate.
Disclosure of Invention
Based on the technical problems in the prior art, the invention provides a method for utilizing MnOX/Fe0Method for treating organic wastewater by activating persulfate through nano composite material by utilizing manganese oxide MnOxLoaded nano zero-valent iron, i.e. MnOX/Fe0Activation of persulfates by nanocomposites due to manganese oxide MnOxThe method can effectively disperse the nano zero-valent iron, thereby remarkably improving the reaction activity of the nano zero-valent iron, and can be used for specifically catalyzing and degrading various organic matters in the organic wastewater when the compound persulfate is used for treating the organic wastewater, thereby having the advantages of high purification efficiency, simple method flow, easy operation, few types of required reagents and low cost.
The invention provides a method for utilizing MnOX/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate comprises the following steps:
s1, crushing and calcining natural manganese ore to obtain MnO containing active ingredientxThe iron salt and the active ingredient MnOxThe mineral powder is fully mixed, and then a reducing agent is added for reduction reaction to obtain MnOX/Fe0A nanocomposite;
s2 MnO obtained in S1X/Fe0Adding the nano composite material and persulfate into the organic wastewater, and treating the organic wastewater under the condition of mechanical stirring.
Preferably, the content of manganese oxide in the natural manganese ore is more than or equal to 80 wt%, and the MnO isxIs MnO or MnO2、Mn2O3、Mn3O4、Mn5O8Or Mn2O7One or a mixture of two or more of them.
Preferably, the iron salt is ferrous salt or trivalent iron salt, preferably FeCl2·4H2O、FeSO4·7H2O、 Fe(NO3)2·6H2O or FeCl3·6H2O; the reducing agent is sodium borohydride or potassium borohydride.
Preferably, the first and second electrodes are formed of a metal,s1, crushing the natural manganese ore to the particle size of 1-10 μm, and calcining at the temperature of 300-900 ℃ for 2-4h to obtain the manganese dioxide containing the active ingredient MnOxThe mineral powder of (1).
Preferably, in S1, the iron salt and the active ingredient MnO are added in a weight ratio of 1:1-1.5xAdding the mineral powder into a mixed solvent of water and ethanol, stirring for 20-30h, fully mixing, filtering, drying, adding an aqueous solution dissolved with a reducing agent to perform a reduction reaction to obtain a precipitate, wherein the adding amount of the reducing agent is the theoretical amount of iron salt which is completely reduced into zero-valent iron, separating, and drying to obtain the MnOX/Fe0A nanocomposite; preferably, nitrogen is introduced for 0.5 to 1 hour before the reduction reaction is carried out by adding the aqueous solution dissolved with the reducing agent.
Preferably, in S2, the MnOX/Fe0The addition amount of the nano composite material is 0.001-2g/L, and the addition amount of the persulfate is 0.001-2 g/L.
Preferably, in S2, MnO obtained in S1 is usedX/Fe0Before the nano composite material and the persulfate are added into the organic wastewater, the pH of the organic wastewater is adjusted to 2-12.
Preferably, the persulfate is one or more of potassium persulfate, sodium persulfate, ammonium persulfate and ferric persulfate.
Compared with the prior art, the invention has the following advantages:
1. the manganese oxide form in the natural manganese ore has diversity, and the manganese oxide formed by combining with oxygen has MnO and MnO2，Mn2O3And Mn3O4Etc. when calcined in air, MnO in the mineral powderxThe active ingredient can take the form of more oxides of manganese in lower valence state, and MnOxThe crystal form is changed, the crystallinity of the obtained sample is higher, and the crystallization is more complete; when nano zero-valent iron is loaded on the nano zero-valent iron, heterogeneous MnO can be preparedX/Fe0The nano composite material catalytic oxidation system can not only improve the dispersibility and stability of the nano zero-valent iron, but also MnOXAnd Fe0The specific surface area of the particles is increasedThe oxide is increased in one step, has excellent oxidation-reduction activity as a transition metal oxide, and can oxidize and degrade various organic pollutants. When MnO is presentX/Fe0When the nano composite material activates persulfate, the transition metal Mn and the nano zero-valent iron activate SO generated by the persulfate4 -To degrade organic contaminants, will have extremely high activation efficiency.
2. MnO ofX/Fe0When the catalytic reaction system of the nano composite material activated persulfate is used for degrading organic pollutants, the discovery that Mn-OH firstly reacts with persulfate to generate Mn- (O) OSO3 -(ii) a Then further reacting with water to obtain free radicals (SO)5 -Or SO4 -·) and the metal element Mn is reduced or oxidized to M during the reaction(n-1)-OH or M(n+1)-OH. In addition, SO is generated4 -With water or OH-The reaction is carried out to generate OH, and the OH and the MnO can jointly act on the degradation of organic pollutantsXMnO used for a heterogeneous catalytic oxidation system is synthesized by a liquid phase reduction method as a precursorX/Fe0A composite material. The method has simple flow, easy operation, few types of required reagents and low cost, and can be applied to industrialized mass production. Research shows that MnO isX/Fe0Has excellent electrochemical performance, so that MnO can be addedX/Fe0And (5) activating the PMS to degrade the organic pollutants.
3. The nanometer zero-valent iron has the advantages of small particle size, high reaction activity, strong reduction capability and the like. The nanometer zero-valent iron has obvious effect on treating pollutants which are difficult to degrade in the wastewater, such as chlorinated organic matters, heavy metal ions, radioactive elements and the like. The nano zero-valent iron is applied to the aspects of environmental pollution treatment and organic pollutant degradation, and a novel concerned pollution control technology is provided. However, the nano zero-valent iron is easy to agglomerate and be easily oxidized, so that the application of the nano zero-valent iron is limited. In this case, MnO is usedXLoading nano zero-valent iron to prepare MnOX/Fe0A nanocomposite material. Not only can improve the dispersibility and stability of the nano zero-valent iron, MnOXAnd may also be strongConverting electrons and pre-concentrating contaminants to MnOXCoupled with the advantages of the nano zero-valent iron, the synergistic removal performance of the nano zero-valent iron on the adsorption oxidation and reduction of organic pollutants is improved, and the reaction principle of the method is as follows:
(1)Fe0+S2O8 2-→Fe2++2SO4 2-
(2)Fe0+H2O+1/2O2→Fe2++OH-
(3)Fe0+H2O→Fe2++1/2H2+OH-
(4)Fe0+2Fe3+→3Fe2+
(5)Fe2++S2O8 2-→Fe3++SO4 2-+SO4 -·
(6)SO4 -·+OH-→SO4 2-+·OH
(7)SO4 -·+H2O→·OH+H+
(8)MnX++S2O8 2-→Mn(X+1)++SO4 -+SO4 2-
(9)MnX++HSO5 -→Mn(X+1)++SO4 -·+OH-。
Detailed Description
Example 1
Preparing an organic wastewater sample to be detected:
1mg, 10mg, 100mg and 1000mg of bisphenol A are respectively added into 1000ml of surface water to obtain water samples of the organic wastewater to be tested with the concentrations of 1mg/L, 10mg/L, 100mg/L and 1000 mg/L.
Treating the organic wastewater sample to be detected:
(1) preparation of MnOX/Fe0Nano composite material:
pulverizing natural manganese ore containing 90 wt% manganese oxide to particle size of 3.7 μm, and heating at 600 deg.CCalcining for 3h to obtain MnO containing active ingredientxThe mineral powder of (1) is FeCl mixed according to the weight ratio of 1:1.22·4H2O and the active ingredient MnOxAdding the mineral powder into a mixed solvent of water and ethanol, stirring for 24 hours, fully mixing, wherein the volume ratio of ethanol to water is 4:1, filtering, drying, adding a 10mol/L aqueous solution dissolved with sodium borohydride for reduction reaction to obtain a precipitate, wherein the addition amount of a reducing agent is the theoretical amount of iron salt which is completely reduced into zero-valent iron, separating, and drying to obtain the MnOX/Fe0A nanocomposite material.
(2) Treating an organic wastewater sample to be detected:
example 1: 0.05g of MnO obtained aboveX/Fe0Adding the nano composite material and 0.05g of potassium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under the stirring condition, and respectively measuring the removal rate of bisphenol A after the treatment reaction for 2 hours and 24 hours, wherein the results are shown in the following table 1:
comparative example 1: adding 0.05g of potassium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under stirring conditions, and respectively measuring the removal rate of bisphenol A after 2h and 24h treatment reaction, wherein the results are shown in the following table 1:
comparative example 2: 0.05g of a solution containing MnO as an active ingredientxAdding the mineral powder and 0.05g of potassium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under stirring conditions, and respectively measuring the concentrations of bisphenol A after 2h and 24h treatment reaction, wherein the results are shown in the following table 1:
comparative example 3: 0.05g of zero-valent iron Fe0And 0.05g of potassium persulfate is added into the organic wastewater samples with different concentrations, the organic wastewater is treated under the stirring condition, the removal rate of the bisphenol A after the treatment reaction for 2 hours and 24 hours is respectively determined, and the results are shown in the following table 1:
(3) and (3) detection results:
TABLE 1
Figure BDA0001805006990000071
Figure BDA0001805006990000081
Through determination, the removal rate of the organic carbon in the water sample of the organic wastewater to be detected with different concentrations, which is treated in the embodiment 1, is 80-90%. MnO ofX/Fe0After the nano composite material is recycled for 10 times, the removal rate of bisphenol A is still 99%, and the removal rate of total organic carbon is still 80-90%.
Example 2
Preparing an organic wastewater sample to be detected:
1mg, 10mg, 100mg, 1000mg and 2000mg of 2, 4-dichlorophenol are respectively added into 1000ml of surface water to obtain organic wastewater samples to be detected with the concentrations of 1mg/L, 10mg/L, 100mg/L, 1000mg/L and 2000mg/L respectively.
Treating the organic wastewater sample to be detected:
(1) preparation of MnOX/Fe0Nano composite material:
pulverizing natural manganese ore with manganese oxide content of 80 wt% to particle size of 1 μm, and calcining at 300 deg.C for 4 hr to obtain active ingredient MnOxThe mineral powder of (1: 1) by weight of FeSO4·7H2O and the active ingredient MnOxAdding the mineral powder into a mixed solvent of water and ethanol, stirring for 30 hours, fully mixing, wherein the volume ratio of ethanol to water is 1:1, filtering, drying, adding a 5mol/L aqueous solution dissolved with potassium borohydride for reduction reaction to obtain a precipitate, wherein the addition amount of a reducing agent is the theoretical amount of iron salt which is completely reduced into zero-valent iron, separating, and drying to obtain the MnOX/Fe0A nanocomposite material.
(2) Treating an organic wastewater sample to be detected:
example 1: 0.001g of MnO obtained aboveX/Fe0Adding the nano composite material and 0.001g of sodium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under the stirring condition, and respectively measuring the concentration of the sodium persulfate in the water for 2 hours,The removal rate of 2, 4-dichlorophenol after the reaction is treated for 24 hours, and the results are shown in the following table 2:
comparative example 1: adding 0.001g of sodium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under stirring, and respectively measuring the removal rate of the 2, 4-dichlorophenol after the 2h and 24h treatment reactions, wherein the results are shown in the following table 2:
comparative example 2: 0.001g of a suspension containing MnO as an active ingredientxAdding the mineral powder and 0.001g of sodium persulfate into the organic wastewater samples with different concentrations, treating the organic wastewater samples under stirring, and respectively measuring the removal rate of 2, 4-dichlorophenol after 2h and 24h treatment reaction, wherein the results are shown in the following table 2:
comparative example 3: 0.001g of zero-valent iron Fe0And 0.001g of sodium persulfate is added into the organic wastewater samples with different concentrations, the organic wastewater samples are treated under the stirring condition, and the removal rate of the 2, 4-dichlorophenol after the 2h and 24h treatment reactions is respectively determined, and the results are shown in the following table 2:
(3) and (3) detection results:
TABLE 2
Figure BDA0001805006990000091
Figure BDA0001805006990000101
Through determination, the removal rate of the organic carbon in the water sample of the organic wastewater to be detected with different concentrations, which is treated in example 1, is 85-95%. MnO ofX/Fe0After the nano composite material is recycled for 10 times, the removal rate of the 2-4-dichlorophenol is still 99 percent, and the removal rate of the total organic carbon is still 85-95 percent.
Example 3
Preparing an organic wastewater sample to be detected:
0.5mg, 10mg, 100mg, 1000mg and 3000mg of antibiotic-norfloxacin are respectively added into 1000ml of surface water to obtain organic wastewater samples to be detected with the concentrations of 0.5mg/L, 10mg/L, 100mg/L, 1000mg/L and 3000mg/L respectively.
Treating the organic wastewater sample to be detected:
(1) preparation of MnOX/Fe0Nano composite material:
pulverizing natural manganese ore with manganese oxide content of 85 wt% to 10 μm, calcining at 900 deg.C for 2 hr to obtain active ingredient MnOxThe mineral powder of (1) is FeCl mixed according to the weight ratio of 1:1.53·6H2O and the active ingredient MnOxAdding the mineral powder into a mixed solvent of water and ethanol, stirring for 30 hours, fully mixing, filtering, drying, adding a 1mol/L aqueous solution dissolved with sodium borohydride for reduction reaction to obtain precipitate, wherein the addition amount of a reducing agent is the theoretical amount of ferric salt which is completely reduced into zero-valent iron, separating, and drying to obtain the MnOX/Fe0A nanocomposite material.
(2) Treating an organic wastewater sample to be detected:
example 1: 2g of MnO obtained aboveX/Fe0The nano composite material and 2g of ammonium persulfate are added into the organic wastewater samples with different concentrations, the organic wastewater samples are treated under the stirring condition, the removal rate of the antibiotic-norfloxacin after the treatment reaction for 2 hours and 24 hours is respectively determined, and the results are shown in the following table 3:
comparative example 1: adding 2g of ammonium persulfate into the organic wastewater water samples with different concentrations, treating the organic wastewater water samples under stirring conditions, and respectively determining the removal rate of the antibiotic-norfloxacin after the treatment reaction for 2 hours and 24 hours, wherein the results are shown in the following table 1:
comparative example 2: 2g of a mixture containing MnO as an active ingredientxThe mineral powder and 2g of ammonium persulfate are added into the organic wastewater samples with different concentrations, the organic wastewater samples are treated under the stirring condition, and the removal rate of the antibiotic-norfloxacin after the treatment reaction for 2 hours and 24 hours is respectively determined, and the results are shown in the following table 3:
comparative example 3: 2g of zero-valent iron Fe0And 2g of ammonium persulfate is added into the organic wastewater samples with different concentrations and stirredTreating the organic wastewater sample, and respectively measuring the removal rate of the antibiotic-norfloxacin after the treatment reaction for 2h and 24h, wherein the results are shown in the following table 3:
(3) and (3) detection results:
TABLE 3
Figure BDA0001805006990000111
Figure BDA0001805006990000121
Through determination, the removal rate of the organic carbon in the organic wastewater samples with different concentrations treated by the method in example 1 is 85-99%. MnO ofX/Fe0After the nano composite material is recycled for 10 times, the removal rate of norfloxacin is still 99%, and the removal rate of total organic carbon is 85-99%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical scope of the present invention, and equivalents and modifications thereof should be included in the technical scope of the present invention.

Claims (10)

1. By using MnOX/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate is characterized by comprising the following steps of:
s1, crushing and calcining natural manganese ore to obtain MnO containing active ingredientxThe iron salt and the active ingredient MnOxThe mineral powder is fully mixed, and then a reducing agent is added for reduction reaction to obtain MnOX/Fe0A nanocomposite;
s2 MnO obtained in S1X/Fe0Adding the nano composite material and persulfate into the organic wastewater, and treating the organic wastewater under the stirring condition.
2. The use of MnO as claimed in claim 1X/Fe0The method for treating organic wastewater by activating persulfate through nano composite material is characterized in that the content of manganese oxide in the natural manganese ore is more than or equal to 80 wt%, and the MnO isxIs MnO or MnO2、Mn2O3、Mn3O4、Mn5O8Or Mn2O7One or a mixture of two or more of them.
3. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by activating persulfate through the nano composite material is characterized in that the ferric salt is ferrous salt or trivalent ferric salt; the reducing agent is sodium borohydride or potassium borohydride.
4. The use of MnO of claim 3X/Fe0The method for treating organic wastewater by activating persulfate through nano composite material is characterized in that ferric salt is FeCl2·4H2O、FeSO4·7H2O、Fe(NO3)2·6H2O or FeCl3·6H2O。
5. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by activating persulfate through the nano composite material is characterized in that in S1, natural manganese ore is crushed to the particle size of 1-10 mu m and then calcined at the temperature of 300-900 ℃ for 2-4h to obtain the active ingredient MnOxThe mineral powder of (1).
6. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate is characterized in that in S1, iron salt and the active ingredient MnO are added according to the weight ratio of 1:1-1.5xAdding the mineral powder into a mixed solvent of water and ethanol, stirring for 20-30h, mixing thoroughly, filtering, drying, adding an aqueous solution dissolved with a reducing agent, and performing a reduction reaction to obtain a precipitateThe addition amount of the reducing agent is the theoretical amount of iron salt which is completely reduced into zero-valent iron, and the MnO is obtained by separation and dryingX/Fe0A nanocomposite material.
7. The use of MnO of claim 6X/Fe0The method for treating organic wastewater by activating persulfate through the nano composite material is characterized in that nitrogen is introduced for 0.5-1h before an aqueous solution dissolved with a reducing agent is added for reduction reaction.
8. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate is characterized in that in S2, MnO is added based on the volume of the organic wastewaterX/Fe0The addition amount of the nano composite material is 0.001-2g/L, and the addition amount of the persulfate is 0.001-2 g/L.
9. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by using the nanocomposite to activate persulfate is characterized in that in S2, MnO obtained in S1 is usedX/Fe0Before the nano composite material and the persulfate are added into the organic wastewater, the pH of the organic wastewater is adjusted to 2-12.
10. The use of MnO according to claim 1 or 2X/Fe0The method for treating organic wastewater by activating persulfate through the nanocomposite is characterized in that the persulfate is one or a mixture of potassium persulfate, sodium persulfate, ammonium persulfate and ferric persulfate.
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