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Device and method for reinforcing electro-catalytic degradation of organic wastewater by using visible light

A technology for electrocatalytic degradation and organic wastewater, which is applied in energy wastewater treatment, light water/sewage treatment, oxidized water/sewage treatment, etc. It can solve the problems of complex types of organic matter, poor selective adsorption of photocatalysts, and low photocatalytic quantum efficiency. , to achieve the effect of improving energy transmission rate, realizing selective photocatalysis, and improving catalytic efficiency

Inactive Publication Date: 2014-06-25
CHONGQING SANZHONG ENVIRONMENTAL PROTECTION INVESTMENT CONSULTANT
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, there are many deficiencies and restrictive factors in the practical application of photocatalytic oxidation technology: currently the main photocatalyst used is titanium dioxide, the band gap of titanium dioxide is 3.2ev, Since the energy of photoexcitation needs to be greater than or equal to the forbidden band, high-energy ultraviolet light excitation is required; the electron-hole pairs generated by photoexcitation are very easy to recombine, and the quantum efficiency of photocatalysis is very low (generally less than 0.1%); organic matter Molecules need to be adsorbed on the surface of the photocatalyst to react, and the types of organic matter in organic wastewater are complex, and the existing photocatalysts have poor selective adsorption

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  • Device and method for reinforcing electro-catalytic degradation of organic wastewater by using visible light
  • Device and method for reinforcing electro-catalytic degradation of organic wastewater by using visible light
  • Device and method for reinforcing electro-catalytic degradation of organic wastewater by using visible light

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Embodiment 1

[0026] figure 1 It is a schematic structural diagram of the device for the visible light-enhanced electrocatalytic degradation of organic wastewater of the present invention. As shown in the figure, the device for visible light-enhanced electrocatalytic degradation of organic wastewater in this embodiment includes an organic wastewater container 1, a photoanode, a cathode 2 and a DC power supply 3. The organic wastewater container 1 is provided with a water inlet 4 and a water outlet 5, the photoanode and the cathode 2 are located in the organic wastewater container 1, and the photoanode includes a conductive substrate 6 and a silicon substrate mounted on the conductive substrate 6. sheet 7, the silicon sheet 7 is provided with a metal coating on one side close to the conductive substrate 6, and the other side is provided with a micron hole, the conductive substrate 6 of the photoanode is connected to the positive pole of the DC power supply 3, and the cathode 2 is connected to...

Embodiment 2

[0034] The difference between the visible light-enhanced electrocatalytic degradation device for organic wastewater of this embodiment and that of Embodiment 1 is that the metal coating on one side of the silicon wafer 7 is uniformly plated on the surface of the silicon wafer by vacuum ion plating, and the metal coating on the other side of the silicon wafer 7 The nanopores are prepared by electrochemical anodization method. The specific preparation process is: the silicon wafer is sandwiched in a single-sided anodization reactor with an O-ring design, and the volume ratio of 1:7:6 is poured into hydrofluoric acid, Mixed reaction solution of hydrogen peroxide and absolute ethanol, the platinum electrode is the counter electrode, forming a two-electrode electrochemical reaction system, the current density is 30mA / cm 2 , the anodic oxidation time is 3 minutes, and the pore diameter of the formed channel is about 20nm.

[0035] The method for degrading organic wastewater using th...

Embodiment 3

[0037] The difference between the visible light-enhanced electrocatalytic degradation device for organic wastewater of this embodiment and that of Embodiment 1 is that the metal coating on one side of the silicon wafer 7 is uniformly plated on the surface of the silicon wafer by vacuum ion plating, and the metal coating on the other side of the silicon wafer 7 The nanopores are prepared by electrochemical anodic oxidation method. The specific preparation process is as follows: the silicon wafer is sandwiched in a single-sided anodic oxidation reactor with an O-ring design, and the volume ratio of 1:10:6 is poured into hydrofluoric acid, Mixed reaction solution of hydrogen peroxide and absolute ethanol, the platinum electrode is the counter electrode, forming a two-electrode electrochemical reaction system, the current density is 40mA / cm 2 , the anodic oxidation time is 5 minutes, and the pore diameter of the formed channel is about 200nm.

[0038] The method for degrading orga...

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Abstract

The invention discloses a device and a method for reinforcing electro-catalytic degradation of organic wastewater by using visible light. The device provided by the invention comprises an organic wastewater container, a photoanode, a cathode and a direct-current power supply, wherein a water inlet and a water outlet are arranged on the organic wastewater container in which the photoanode and the cathode are positioned, the photoanode comprises a conducting substrate and a silicon slice installed on the conducting substrate, one surface of the silicon slice, which is tightly attached to the conducting substrate, is provided with a metal coating, the other surface is provided with a micron or nano duct, the conducting substrate of the photoanode is connected with an anode of the direct-current power supply, and the cathode is connected with a cathode of the direct-current power supply. According to the method using the device for degrading the organic wastewater, the visible light is used for illuminating the photoanode to excite photoelectron and holes, simultaneously voltage is applied to the photoanode by using the direct-current power supply so that the photoanode performs electro-catalytic degradation on the organic wastewater under the bias-voltage synergistic effect. The invention realizes visible light catalysis and selective photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic treatment of organic wastewater, and in particular relates to a device and method for visible light-enhanced electrocatalytic degradation of organic wastewater. Background technique [0002] With the development of my country's industry, the discharge of organic wastewater is increasing day by day. Photocatalytic oxidation technology is a new technology and method for organic wastewater treatment. Photocatalytic oxidation technology is to add a certain amount of photosensitive semiconductor material to the pollution system, and at the same time combine a certain amount of light radiation, so that the photosensitive semiconductor is excited to generate electron-hole pairs under the irradiation of light, and the dissolved oxygen, adsorbed on the semiconductor, Water molecules interact with electrons and holes to produce highly oxidizing free radicals such as HO, and then through the addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/48C02F1/72C02F1/28
CPCY02W10/37
Inventor 畅航乔雷张胜涛
Owner CHONGQING SANZHONG ENVIRONMENTAL PROTECTION INVESTMENT CONSULTANT
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