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Photoelectrocatalytic system and method for recovering precious metal silver while degrading organic pollutants

A photoelectric catalysis and system technology, applied in the field of water treatment, can solve the problems of different implementation conditions and treatment principles, difficulty in simultaneously meeting the treatment requirements of heavy metal-organic pollutant complex pollution, environmental secondary pollution, etc., and achieve the suppression of hydrogen evolution side reactions , increase the number, promote the effect of separation

Inactive Publication Date: 2019-09-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, in the Fenton reaction, the more commonly used activators are transition metal ions, which will cause secondary pollution to the environment.
[0004] At present, the treatment of heavy metals and organic pollutants is mainly the treatment of single pollutants and the treatment of heavy metals alone, because the treatment of heavy metals and the treatment of organic pollutants are different in terms of implementation conditions and treatment principles. Each is different, and it is difficult to meet the treatment requirements of heavy metal-organic pollutant compound pollution at the same time

Method used

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  • Photoelectrocatalytic system and method for recovering precious metal silver while degrading organic pollutants

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Embodiment 1

[0045] like figure 1 As shown, the present embodiment provides a kind of photoelectrocatalysis system, comprises photoelectric reactor 1, photoanode 2, negative electrode 3, electrolyte and persulfate solution; Photoelectric reactor 1 is used to hold electrolyte and persulfate solution , the photoanode 2 and the cathode 3 are arranged in the photoelectric reactor 1, the photoanode 2 and the cathode 3 are connected through an external circuit, and the photoanode 2 is a photocatalytic active semiconductor photoelectrode responding to visible light.

[0046] The electrolyte is 50mM sodium perchlorate solution; the persulfate is 5mM potassium hydrogen persulfate compound salt; the photoanode 2 is a bismuth vanadate electrode, and the cathode 3 is a titanium sheet electrode.

[0047] The preparation method of the bismuth vanadate electrode is: the deposition solution of the precursor bismuth oxyiodide is mixed with 100mL of nitric acid aqueous solution with pH=1.2 containing 0.0075...

Embodiment 2

[0054] The structure and preparation method of the photoelectrocatalytic system are the same as in Example 1.

[0055] Utilize above-mentioned photocatalytic system to degrade organic pollutant and reclaim the method for noble metal silver simultaneously as described in embodiment 1, difference is: the bias voltage of photoanode 2 in step (1) is set to 0.74V vs. NHE, step (2) , (3), (4) are with embodiment 1. The degradation rate of phenol was 98.1%, the recoveries of silver ions at photoanode 2 and cathode 3 were 21.3% and 74.4% respectively, and the total recovery rate was 95.7%.

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Abstract

The invention discloses a photoelectrocatalytic system and a method for recovering precious metal silver while degrading organic pollutants. The photoelectrocatalytic system comprises a photoelectric reactor, a photo-anode, a cathode, electrolyte and a persulfate solution, wherein the photoelectric reactor is used for containing the electrolyte and the persulfate solution; the photo-anode and the cathode are arranged in the photoelectric reactor; the photo-anode is connected with the cathode by means of an external circuit; the photo-anode is a visible light responsive photocatalytically active semiconductor photoelectrode. The invention also discloses the method for recovering precious metal silver while degrading organic pollutants; wastewater containing silver ions and the organic pollutants is added into the photoelectrocatalytic system, and a photoelectrocatalytic reaction is carried out under the action of visible light. The method provided by the invention can realize efficient removal of the organic pollutants and the recovery of the precious metal silver, the removal rate of the organic pollutants can reach 96.5% or above, and the total recovery rate of the silver ions can reach 94.6% or above.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a photoelectric catalytic system and a method for degrading organic pollutants while recovering precious metal silver. Background technique [0002] Silver is widely used in petrochemical, electroplating, imaging, medical, jewelry, and daily necessities such as socks, paint, bandages, and food containers due to its good catalytic, electrical, photosensitive, ductile, and antibacterial properties. The wide application of silver will not only produce a large amount of silver-containing wastewater, but also consume silver reserves continuously. Silver exists in the form of positive monovalent ions in silver-containing wastewater, which is mobile and toxic. From the perspective of pollution prevention and control, the recovery of silver ions in wastewater can achieve the purpose of purifying wastewater; from the perspective of resource utilization, the recovery of silver ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/461C02F101/10C02F101/30
CPCC02F1/30C02F1/46109C02F2101/10C02F2101/30
Inventor 赵旭邵荟芯
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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