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Photoelectrocatalytic method for treating heavy metal complex waste water and recovering heavy metal therefrom

A technology of heavy metal ions and photoelectric catalysis, applied in the field of water treatment, can solve the problem of insufficient attention and research on the cathode effect, and achieve the effect of effective treatment

Active Publication Date: 2014-11-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the role of the cathode has not been fully valued and studied

Method used

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  • Photoelectrocatalytic method for treating heavy metal complex waste water and recovering heavy metal therefrom

Examples

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Effect test

Embodiment 1

[0053] Embodiment 1: to the processing of Cu-EDTA simulated waste water

[0054] This embodiment uses Cu-EDTA to simulate wastewater, wherein the initial concentration of Cu-EDTA is 20mg / L, and the NaClO of 10mmol / L 4 as background electrolyte. The Cu-EDTA simulated wastewater is treated by the photocatalytic method of the present invention, only the electrochemical oxidation method, and only the photocatalytic oxidation method.

[0055] The processing steps using the photoelectrocatalytic method of the present invention are: figure 1 As shown in the photoelectric reactor, open the water inlet valve, turn on the peristaltic pump 8, open the water outlet valve, fill in the water containing Cu-EDTA to be treated, when the water outlet valve overflows, turn off the peristaltic pump 8; turn on the electrode DC power supply 5, turn on The low-pressure mercury lamp AC power supply 6 adjusts the rotating speed of the peristaltic pump 8 to control the residence time, and the photoel...

Embodiment 2

[0058] Embodiment 2: to the processing of Pb-EDTA simulated waste water

[0059] The present embodiment adopts Pb-EDTA simulated waste water, wherein the initial concentration of Pb-EDTA is 0.1mmol / L, TOC (total organic carbon content) is 12mg / L, the NaClO of 10mmol / L 4 as background electrolyte. The photoelectric catalysis method of the invention is used to treat Pb-EDTA simulated wastewater.

[0060] The processing steps using the photoelectrocatalytic method of the present invention are: figure 1 For the photoelectric reactor shown, open the water inlet valve, turn on the peristaltic pump 8, open the water outlet valve, fill in the water containing Pb-EDTA to be treated, when the water outlet valve overflows, turn off the peristaltic pump 8; turn on the DC power supply 5, and turn on the low pressure The mercury lamp AC power supply 6 adjusts the rotating speed of the peristaltic pump 8 to control the residence time, and the photoelectric oxidation reaction begins. Under...

Embodiment 3

[0061] Embodiment 3: to the treatment of Ni-EDTA simulated waste water

[0062] This embodiment uses Ni-EDTA to simulate wastewater, wherein the initial concentration of Ni-EDTA is 0.05mmol / L, and the NaClO of 10mmol / L 4 as background electrolyte. The Ni-EDTA simulated wastewater is treated by the photoelectric catalytic method of the invention.

[0063] The processing steps using the photoelectrocatalytic method of the present invention are: figure 1 As shown in the photoelectric reactor, open the water inlet valve, turn on the peristaltic pump 8, open the water outlet valve, fill in the water containing Ni-EDTA to be treated, when the water outlet valve overflows, turn off the peristaltic pump 8; turn on the DC power supply 5, and turn on the low pressure The mercury lamp AC power supply 6 adjusts the rotating speed of the peristaltic pump 8 to control the residence time, and the photoelectric oxidation reaction begins. Under the condition of pH=9.0, adjust the power of t...

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Abstract

The invention provides a photoelectrocatalytic method for treating heavy metal complex waste water and recovering heavy metal therefrom, and particularly the method includes following steps: irradiating a surface of a TiO2 thin film on an anode in a photoelectro-reactor, in which the waste water is accommodated, through an ultraviolet light with a wavelength being less than 387 nm to generate photo-produced cavities and hydroxyl radicals which are used as a strong oxidant, wherein the strong oxidant enables a heavy metal complex to be degraded; and meanwhile reducing and recovering free metal ions on a cathode through electro-deposition. The photoelectro-reactor comprises an ultraviolet lamp emitting the ultraviolet light, the anode which is a TiO2 thin film electrode with titanium being a substrate, and the cathode, wherein the anode and the cathode are respectively connected to a positive pole and a negative pole of a DC power supply.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a photoelectric catalytic method for treating heavy metal complex waste water and simultaneously recovering heavy metals. technical background [0002] In recent years, the removal and recycling of heavy metals in industrial wastewater has attracted more and more attention. When heavy metals exist in a free state, traditional coagulation, precipitation, adsorption, ion exchange and membrane separation methods can be used to remove and recover heavy metals. When heavy metal wastewater contains organic substances with complexing ability (such as: ethylenediaminetetraacetic acid, diethyltriaminepentaacetic acid, phosphorus-containing organic substances), these substances can form structurally stable chelates with heavy metal ions. Chelates exist in water in a dissolved state, and their structure is abnormally stable, so that heavy metals have better migration ability and a wider range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/467C02F1/46C02F1/62
Inventor 赵旭郭礼宝张隽禹曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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