CN110655142A - Method for treating cyanide-containing wastewater by photoelectrocatalysis - Google Patents
Method for treating cyanide-containing wastewater by photoelectrocatalysis Download PDFInfo
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- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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- 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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Abstract
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating cyanide-containing wastewater through photoelectrocatalysis. Preparing a composite material from molybdate, sulfide, nano titanium dioxide and chitosan, and granulating to obtain composite material particles; sieve plates are arranged in the electrolytic bath at intervals, and the composite material particles are placed on the sieve plates; adding the cyanide-containing wastewater into an electrolytic cell, and reacting under the conditions of light irradiation and electrification to treat the cyanide-containing wastewater. The invention does not need external supplementary gas, realizes the decomposition of cyanide by using oxygen generated in the electrolytic process, and simultaneously deposits copper on the cathode. The composite material has two functions, namely, the porous structure is utilized to transmit oxygen generated in the electrolytic process, and the composite material has the function of a catalyst to accelerate the catalytic decomposition of cyanide, so that the cyanide is thoroughly removed and copper is recycled in one step.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating cyanide-containing wastewater through photoelectrocatalysis.
Background
Cyaniding and smelting of gold and silver is one of the main sources of cyanide-containing waste water. The cyanide concentration (generally expressed by NaCN in industrial production) of the direct cyanidation of the gold concentrate is controlled to be 2.0-3.0g/L, and the sodium cyanide concentration of the roasting-acid leaching-cyanidation process is controlled to be 1.0-1.5 g/L. Metals such as copper, zinc, iron and the like in the cyanide barren solution form a complex with cyanide, and the complex becomes a harmful pollutant which is difficult to treat. Most barren solution is reused to be used as cyaniding and pulp mixing water, but the cyaniding barren solution has fatigue phenomenon, namely cyanide exists, but the gold dissolving reaction can not occur, namely the so-called swelling in the production, and the barren solution needs to be treated. Currently, the treatment of 1 ton gold concentrate produces 4m3The cyanide-containing wastewater. In addition, a large amount of cyanide-containing wastewater is generated in the cyaniding electroplating process, and the two types of wastewater have the common characteristics of high cyanide concentration, coexistence of metal and cyanide complex and high toxicity, so that the cyanide-containing wastewater must be strictly treated, and the cyanide and the metal in the discharged water meet the requirements specified by the national environmental protection department.
The cyanide-containing wastewater treatment method is a plurality of methods, the acidification method is a technology commonly adopted by the current factories and can recover cyanide to the maximum extent, but the method requires a closed system, has the danger of hydrogen cyanide overflow, and operatesThe method is complex, and the cyanogen-containing residual liquid after one-time treatment can not reach the national discharge standard, and needs secondary treatment, which increases the production cost and the technical difficulty. Other technologies in the research phase include two broad categories, decontamination and regeneration. The purification method adopts related chemicals to destroy cyanide-containing complex ions in cyanide wastewater and reduce the content of cyanide. The common methods mainly include alkali chlorine oxidation method and SO2Air oxidation, hydrogen peroxide oxidation, electrolytic oxidation, microbial oxidation, and the like. The method adopts a strong oxidant to decompose most of cyanide, but the concentration of zinc and copper in the cyanide is very high, the formed cyanide complex is very stable, and the cyanide-containing wastewater cannot be thoroughly treated. The alkaline chlorine oxidation method has serious secondary pollution, frequent chlorine leakage, difficult process control, large consumption, serious water salinization and higher cost, and is a pure consumable sewage treatment method. The air oxidation method for treating cyanide-containing wastewater by sulfur dioxide has the defects of weak oxidation capability of sulfur dioxide and large consumption. The hydrogen peroxide in the hydrogen peroxide oxidation method is a strong oxidant, has strong corrosivity, is difficult to transport and has higher price, and is difficult to popularize and apply. The regeneration method is to recycle cyanide and valuable metals, and mainly comprises an ion exchange method, a solvent extraction method, a membrane method and the like. In addition, a photocatalysis method is adopted, wherein the photocatalysis method is used for treating the cyanide-containing wastewater, cyanide is decomposed through a catalytic material, and metal is adsorbed out through a porous material, so that the cyanide-containing wastewater is purified. However, this method has a disadvantage that the treated porous material is difficult to recover by further treatment and has a problem in secondary use.
Chinese patent CN107129079A discloses a method for treating low-concentration copper-containing cyanide-containing wastewater, which comprises the steps of passing the low-concentration copper-containing cyanide-containing wastewater through an activated carbon adsorption device until the cyanide in the effluent reaches the penetration concentration, and discharging the total effluent which reaches the standard. Placing the cyanogen-carrying activated carbon and chlorine-containing solution in an electrolytic device, removing cyanides in the cyanogen-carrying activated carbon through electrooxidation, and dissociating copper in a copper-cyanogen complex into Cu2+Adding sulfide into the electrolytic solution to lead Cu to be2+Converted to CuS for recovery. The decyanation activated carbon is recycled and used for an activated carbon adsorption device, and the liquid after copper precipitation is recycled and supplemented with chlorine for useA chlorine-containing solution. The method has the advantages that the resolving agent can be circulated, the resolving cost is low, the resolving efficiency is high, the cyanogen breaking cost is low, and residual chlorine does not exist in discharged water. The disadvantages are that absorption, analysis, electrolysis and precipitation are needed, the flow is long, and cyanogen and heavy metal can not be removed synchronously.
Chinese patent CN109592749A discloses a method for treating cyanide in gold smelting cyanide-containing wastewater, which comprises the following steps: A. the method comprises the following steps of mixing cyanide-containing alkaline wastewater with the pH value of 10-11 and cyanide-containing acidic wastewater with the pH value of 2-3 according to the volume ratio of (3-4): 1 stirring and mixing to obtain a mixed solution; B. b, adding the mixed solution obtained in the step A into an electrolytic tank for electrolysis to obtain electrolyte; C. and C, adjusting the pH value of the electrolyte obtained in the step B to 10-11, adding sodium percarbonate and copper sulfate, inflating and stirring for reaction to obtain a reaction solution. The treatment method utilizes the mixing of the cyanogen-containing acidic wastewater and the cyanogen-containing alkaline wastewater, hydrogen cyanide gas is easily generated in the mixing process, so that dangerous gas leakage is caused, the cyanogen-containing wastewater is treated step by adopting electrolysis and copper sulfate and sodium percarbonate catalytic oxidation, the process flow is long, and metal can not be well recovered.
At present, a method for treating cyanide-containing wastewater, which has a short process flow and high treatment efficiency and can be used for metal recovery, is urgently needed.
Disclosure of Invention
The invention aims to provide a method for treating cyanide-containing wastewater through photoelectrocatalysis, which can realize the recovery of metal while breaking cyanide, has no pollution to catalytic materials, can directly recycle the cyanide-containing wastewater, realizes the short-flow and high-efficiency treatment of the cyanide-containing wastewater, and provides a new idea for the wastewater treatment in the gold industry.
The method for treating cyanide-containing wastewater by photoelectrocatalysis comprises the steps of preparing a composite material from molybdate, sulfide, nano titanium dioxide and chitosan, and granulating to obtain composite material particles; sieve plates are arranged in the electrolytic bath at intervals, and the composite material particles are placed on the sieve plates; adding the cyanide-containing wastewater into an electrolytic cell, and reacting under the conditions of light irradiation and electrification to treat the cyanide-containing wastewater.
The sieve plates are horizontally arranged, the spacing distance of the sieve plates is 1-10cm, and the diameter of the composite material particles is larger than the aperture of the sieve plates; the diameter of the sieve plate is preferably less than 0.5mm, and the grain size of the composite material is more than 0.5 mm.
The molybdate is one of sodium molybdate, potassium molybdate, calcium molybdate, magnesium molybdate or lithium molybdate. The concentration of the molybdate is 1-10 mol/L.
The sulfide is one of sodium sulfide, potassium sulfide or ammonium sulfide. The concentration of the sulfide is 1-10 mol/L.
The mass ratio of the molybdate to the sulfide to the nano titanium dioxide is 3-30: 1: 1-10.
The nano titanium dioxide is commercial powder.
The preparation method of the composite material comprises the steps of uniformly mixing molybdate and sulfide, dropwise adding acid to adjust the pH value, adding nano titanium dioxide, stirring, filtering and drying, grinding the dried powder, mixing the powder with chitosan, and roasting to obtain the composite material.
The mass ratio of the chitosan to the powder is 1-20: 100.
the concentration of the acid is 50-200 g/L.
The pH value is 0.5-3, the stirring time is 1-8 hours, the drying temperature is 50-120 ℃, the roasting temperature is 300-700 ℃, and the roasting time is 30-120 min.
The cyanide-containing wastewater is copper-containing cyanide wastewater, cyanide in the cyanide-containing wastewater mainly has two forms of free cyanide and cyanide complexed with copper, and the copper is mainly copper complexed with the cyanide.
The cyanide concentration in the cyanide-containing wastewater is 200-1000mg/L, one part of the cyanide is complexed with copper, and the other part exists as free cyanide. The copper concentration is 200-1000 mg/L.
The mode of adding the cyanide-containing wastewater into the electrolytic bath is intermittent.
The light is visible light.
The electrifying time is 5-60min, and the electrifying voltage is 1-31V.
The method for treating cyanide-containing wastewater by photoelectrocatalysis comprises the following steps:
(1) uniformly mixing molybdate and sulfide with certain concentration, placing the mixture in a flask, dropwise adding acid solution with certain concentration to adjust the pH value, adding a certain amount of nano titanium dioxide when the pH value is proper, fully stirring for a certain time, filtering and drying. And fully grinding the dried powder, mixing with chitosan, and roasting to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
(2) Arranging a sieve plate in the electrolytic cell at certain intervals, and controlling the diameter of the sieve plate hole. Evenly spreading the composite material particles on the sieve plate, wherein the particle diameter of the composite material particles is larger than the aperture of the sieve plate. Intermittently injecting the cyanide-containing wastewater into an electrolytic cell, irradiating and electrifying simultaneously, and reacting for a certain time under the control of a certain temperature, a certain stirring speed and a certain voltage. When the solution changed from colorless to deep blue, the light was stopped and the electrolysis was continued. When the cyanide-containing waste water in the electrolytic cell changes from dark blue to colorless, purified water is discharged. The cyanogen is decomposed into N under the action of composite material and illumination condition2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field.
In the step (2), the height of the composite material particles evenly paved on the sieve plate is 0.5-10 mm.
And (3) the temperature of the solution in the electrolytic cell in the step (2) is normal temperature.
The stirring speed in the step (2) is 100-800 r/min.
The principle of the invention is as follows:
the method for treating cyanide-containing wastewater by photoelectrocatalysis provided by the invention has double functions of decomposing cyanide and recovering metal copper. The solution generates oxygen under the electrolysis action, the composite material is a porous material, and the oxygen enters the pore channels of the composite material. Under the action of sunlight, cyanide in the copper cyanide complex ion reacts with oxygen to be decomposed into N under the action of the composite material2And CO2The copper in the complex copper cyanide compound becomes copper ions. Under the action of electrolysis, the copper obtains electrons at the cathode and becomes simple substance copper to deposit at the cathode. The reaction equation is as follows:
Cu2++2e→Cu
the invention has the following beneficial effects:
the invention does not need external supplementary gas, realizes the decomposition of cyanide by using oxygen generated in the electrolytic process, and simultaneously deposits copper on the cathode. The composite material has two functions, namely, the porous structure is utilized to transmit oxygen generated in the electrolytic process, and the composite material has the function of a catalyst to accelerate the catalytic decomposition of cyanide, so that the cyanide is thoroughly removed and copper is recycled in one step.
According to the electrolytic cell, the sieve plates are horizontally arranged at intervals of a certain distance, and the diameters of the sieve plates are controlled, so that the composite material can be laid on the sieve plates, cyanide-containing wastewater can be more contacted with the composite material, and the catalytic decomposition effect is enhanced; if the sieve plate is not arranged, the composite material can be deposited at the bottom of the container, and the contact effect is influenced.
The method breaks cyanide, simultaneously realizes the recovery of metal, has no pollution to catalytic materials, can be directly recycled, realizes the short-flow and high-efficiency treatment of cyanide-containing wastewater, and provides a new idea for the wastewater treatment in the gold industry.
Drawings
FIG. 1 is a schematic view of the electrolytic apparatus of the present invention.
In the figure: 1. an electrolytic cell; 2. a constant temperature magnetic heating stirrer; 3. an electrode; 4. a voltage-stabilizing current-stabilizing power supply; 5. and (4) a sieve plate.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
Respectively mixing 150mL of sodium molybdate solution with the concentration of 10mol/L and sodium sulfide solution with the concentration of 200g/L uniformly, placing the mixture into a flask, dropwise adding sulfuric acid solution with the concentration of 98g/L to adjust the pH value, adding 15g of nano titanium dioxide when the pH value is 1.5, fully stirring for 4h, filtering and drying at 120 ℃. Fully grinding the dried powder, and mixing with chitosan, wherein the mass ratio of the chitosan to the powder is 20: roasting at 100 and 500 ℃ for 120min to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
Sieve plates are arranged in the electrolytic cell at intervals, the vertical distance between two adjacent sieve plates is 2cm, and the diameter of each sieve plate is 0.3 mm. The granulated particle size of the composite material was 0.8 mm. 10g of composite material particles are spread on a sieve plate with the height of 1 mm. 1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 946mg/L, the copper concentration is 352mg/L, the cyanide wastewater is placed into an electrolytic bath, the temperature is controlled to be 35 ℃, the stirring speed is 400r/min, the voltage of a stabilized voltage supply is controlled to be 30V, and 35mim is reacted under sunlight. The cyanogen is decomposed into N under the conditions of composite material and illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. And after the electrolysis is finished, taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 0.6mg/L and the copper concentration was 0.4 mg/L. The cyanide removal rate was 99.94%, and the copper recovery rate was 99.89%.
Example 2
Respectively mixing 250mL of sodium molybdate solution with the concentration of 5mol/L and sodium sulfide solution with the concentration of 100g/L uniformly, placing the mixture into a flask, dropwise adding sulfuric acid solution with the concentration of 2mol/L to adjust the pH value, adding 20g of nano titanium dioxide when the pH value is 1.5, fully stirring for 8h, filtering and drying at 120 ℃. Fully grinding the dried powder, and mixing with chitosan, wherein the mass ratio of the chitosan to the powder is 15: roasting at 100 and 500 ℃ for 120min to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
Sieve plates are arranged in the electrolytic cell at intervals, the vertical distance between two adjacent sieve plates is 2cm, and the diameter of each sieve plate is 0.3 mm. The granulated particle size of the composite material was 0.7 mm. 20g of composite material particles are paved in a sieve plate with the height of 1 mm. 1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 958mg/L, the copper concentration is 468mg/L, the cyanide wastewater is placed into an electrolytic bath, the temperature is controlled at 30 ℃, the stirring speed is 400r/min, the voltage of a regulated power supply is controlled at 30V, and the cyanide wastewater reacts for 50mim in sunlight. The cyanogen is decomposed into N under the conditions of composite material and illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. After the electrolysis is finishedAnd taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 0.6mg/L and the copper concentration was 0.9 mg/L. The cyanide removal rate was 99.94%, and the copper recovery rate was 99.81%.
Example 3
Respectively mixing 500mL of 10mol/L sodium molybdate and 200g/L sodium sulfide solution uniformly, placing the mixture in a flask, dropwise adding 2mol/L sulfuric acid solution to adjust the pH value, adding 40g of nano titanium dioxide when the pH value is 1, fully stirring for 8h, filtering, and drying at 120 ℃. Fully grinding the dried powder, and mixing with chitosan, wherein the mass ratio of the chitosan to the powder is 20: roasting at 100 and 500 ℃ for 120min to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
Sieve plates are arranged in the electrolytic cell at intervals, the vertical distance between two adjacent sieve plates is 4cm, and the diameter of each sieve plate is 0.4 mm. The granulated particle size of the composite material was 0.8 mm. 30g of composite material particles are paved in a sieve plate with the height of 2 mm. 1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 789mg/L, the copper concentration is 364mg/L, the cyanide wastewater is put into an electrolytic bath, the temperature is controlled to be 30 ℃, the stirring speed is 400r/min, the voltage of a regulated power supply is controlled to be 20V, and the cyanide wastewater reacts for 60mim in sunlight. The cyanogen is decomposed into N under the conditions of composite material and illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. And after the electrolysis is finished, taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 0.8mg/L and the copper concentration was 0.4 mg/L. The cyanide removal rate was 99.90%, and the copper recovery rate was 99.89%.
Example 4
Respectively and uniformly mixing 250mL of sodium molybdate solution with the concentration of 2mol/L and sodium sulfide solution with the concentration of 100g/L, placing the mixture into a flask, dropwise adding 2mol/L sulfuric acid solution to adjust the pH value, adding 20g of nano titanium dioxide when the pH value is 1, fully stirring the mixture for 6 hours, filtering the mixture, and drying the mixture at 120 ℃. Fully grinding the dried powder, and mixing with chitosan, wherein the mass ratio of the chitosan to the powder is 15: roasting at 100 and 500 ℃ for 120min to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
Sieve plates are arranged in the electrolytic bath at intervals, and the adjacent two sieve plates are verticalThe distance is 1.5cm, and the diameter of the sieve plate is 0.2 mm. The granulated particle size of the composite material was 0.6 mm. 40g of composite material particles are spread in a sieve plate with the height of 3 mm. 1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 768mg/L, the copper concentration is 389mg/L, the cyanide wastewater is put into an electrolytic bath, the temperature is controlled to be 25 ℃, the stirring speed is 400r/min, the voltage of a stabilized voltage supply is controlled to be 20V, and the cyanide wastewater reacts for 50mim in sunlight. The cyanogen is decomposed into N under the conditions of composite material and illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. And after the electrolysis is finished, taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 0.4mg/L and the copper concentration was 0.3 mg/L. The cyanide removal rate was 99.95%, and the copper recovery rate was 99.92%.
Comparative example 1
The composite material was not added, the sieve plate was not provided, and the remaining processing procedure was the same as in example 1.
1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 946mg/L, the copper concentration is 352mg/L, the cyanide wastewater is placed into an electrolytic bath, the temperature is controlled to be 35 ℃, the stirring speed is 400r/min, the voltage of a stabilized voltage supply is controlled to be 30V, and 35mim is reacted under sunlight. Decomposition of cyanide to N under illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. And after the electrolysis is finished, taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 256mg/L and the copper concentration was 129 mg/L. The cyanide removal rate was 72.94%, and the copper recovery rate was 63.35%.
Comparative example 2
The composite material was added without a sieve plate, and the remaining processing was the same as in example 1.
Respectively mixing 150mL of sodium molybdate solution with the concentration of 10mol/L and sodium sulfide solution with the concentration of 200g/L uniformly, placing the mixture into a flask, dropwise adding sulfuric acid solution with the concentration of 98g/L to adjust the pH value, adding 15g of nano titanium dioxide when the pH value is 1.5, fully stirring for 4h, filtering and drying at 120 ℃. Fully grinding the dried powder, and mixing with chitosan, wherein the mass ratio of the chitosan to the powder is 20: roasting at 100 and 500 ℃ for 120min to obtain the composite material. And (4) granulating the composite material to obtain composite material particles.
10g of the composite particles were added directly to the cell. 1000mL of cyanide wastewater, the pH value of the solution is 10, the cyanide concentration is 946mg/L, the copper concentration is 352mg/L, the cyanide wastewater is placed in an electrolytic bath, the temperature is controlled to be 35 ℃, the stirring speed is 400r/min, the voltage of a regulated power supply is controlled to be 30V, and 35mim is reacted under sunlight. The cyanogen is decomposed into N under the conditions of composite material and illumination2And CO2And the copper ions complexed with cyanide become free copper ions, and are deposited on the cathode under the action of an electric field. And after the electrolysis is finished, taking out the electrolyte to analyze the concentration of cyanide and copper. The cyanide concentration was 160mg/L and the copper concentration was 98 mg/L. The cyanide removal rate was 83.09%, and the copper recovery rate was 72.16%.
Claims (10)
1. A method for treating cyanide-containing wastewater by photoelectrocatalysis is characterized in that molybdate, sulfide, nano titanium dioxide and chitosan are prepared into a composite material, and composite material particles are obtained after granulation; sieve plates are arranged in the electrolytic bath at intervals, and the composite material particles are placed on the sieve plates; adding the cyanide-containing wastewater into an electrolytic cell, and reacting under the conditions of light irradiation and electrification to treat the cyanide-containing wastewater.
2. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the sieve plates are horizontally arranged, the spacing distance between the sieve plates is 1-10cm, and the particle diameter of the composite material is larger than the pore diameter of the sieve plates.
3. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the molybdate is one of sodium molybdate, potassium molybdate, calcium molybdate, magnesium molybdate and lithium molybdate.
4. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the sulfide is one of sodium sulfide, potassium sulfide or ammonium sulfide.
5. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the mass ratio of molybdate, sulfide and nano titanium dioxide is 3-30: 1: 1-10.
6. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the preparation method of the composite material comprises the steps of uniformly mixing molybdate and sulfide, dropwise adding acid to adjust the pH value, adding nano titanium dioxide, stirring, filtering and drying, grinding the dried powder, mixing the ground powder with chitosan, and roasting to obtain the composite material.
7. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 6, wherein the mass ratio of chitosan to powder is 1-20: 100.
8. the method for photoelectrocatalytic treatment of cyanide-containing wastewater as recited in claim 6, wherein the pH value is 0.5-3, the stirring time is 1-8 hours, the drying temperature is 50-120 ℃, the roasting temperature is 300-700 ℃, and the roasting time is 30-120 min.
9. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the light is visible light.
10. The method for photoelectrocatalytic treatment of cyanide-containing wastewater according to claim 1, wherein the energization time is 5-60min and the energization voltage is 1-31V.
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| CN113060801A (en) * | 2021-03-29 | 2021-07-02 | 山东理工大学 | Electrochemical device for treating cyanide-containing wastewater and preparation method and application thereof |
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