Method for degrading organic matters by photoelectrocatalysis

A technology of photoelectric catalysis and organic matter, which is applied to the application of graphene/titanium dioxide composite structure thin film electrodes in the field of photoelectric catalytic degradation, and the application of modified thin film electrode materials in the field of photoelectric catalytic degradation of organic matter, to improve conduction and the method is simple and easy to operate. , controllable and repeatable effects

Active Publication Date: 2012-07-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, by consulting relevant domestic and foreign journals and patent materials, it is found that the current research on graphene mainly focuses on graphene / TiO 2 The application of powder in photocatalysis, and the use of graphene / TiO 2 The study of photoelectrocatalytic treatment of pollutants with composite thin films has not yet been involved

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  • Method for degrading organic matters by photoelectrocatalysis
  • Method for degrading organic matters by photoelectrocatalysis
  • Method for degrading organic matters by photoelectrocatalysis

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) Graphite oxide / TiO 2 Preparation of complex:

[0031] Weigh 0.01g of purchased graphene oxide (Xianfeng Nano, Nanjing), add to 50ml of water, then add 1g of TiO 2 And 0.1g PEG (polyethylene glycol), ultrasonic 30min, finally get graphene oxide / TiO 2 Complex.

[0032] Such as figure 1 (a), it can be seen that the size of graphene oxide is on the order of microns, and the graphene oxide shown in the figure is a sheet-like structure with certain wrinkles.

[0033] Such as figure 1 (b), it can be seen that TiO 2 The diameter of the nanoparticles is about 20nm, and the TiO 2 Nanoparticles are well compounded with graphene oxide.

[0034] 2) Graphene / TiO 2 Film preparation:

[0035] The resulting graphene oxide / TiO 2 Composite coated on conductive glass resulting in graphene oxide / TiO 2 film. After being dried at 80°C, it was reduced with hydrazine hydrate vapor at 60°C for 24 hours, and then the obtained sample was calcined at 400°C for 0.5 hours, and the obta...

Embodiment 2

[0040] 1) Photodegradation catalytic experimental device:

[0041] Thin film electrode, platinum wire and saturated calomel electrode were used as working electrode, counter electrode and reference electrode respectively. The electrolyte is 0.1M Na 2 SO 4 Aqueous solution, the applied bias is provided by DJS-292C potentiostat.

[0042] Such as Figure 4 , shown in the figure is the device diagram for photodegradation. Among them, (1) working electrode (film electrode); (2) reference electrode; (3) counter electrode; (4) rotor; (5) Na 2 SO 4 solution; (6) potentiostat; (7) light source; (8) magnetic stirrer.

[0043] 2) Establishment of adsorption / desorption equilibrium between dyes and thin film electrodes:

[0044] Graphene / TiO 2 Thin film electrodes were added with an initial concentration of 0.5×10 -5 M Rhodamine B dissolved in water (50ml), with a saturated calomel electrode as a reference electrode and Pt as a counter electrode. Then stir at room temperature for...

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Abstract

The invention provides a method for degrading organic matters by photoelectrocatalysis, belonging to the technical field of non-organic metal materials and pollutant treatment. A graphene / semiconductor oxide composite structure thin film is prepared on conducting glass by a coating method, wherein the mass ratio of the graphene to the semiconductor oxide is (0.2-1.5%): 1. A thin film electrode prepared by using the method provided by the invention is flat in surface and is firmly combined with a substrate. Due to introduction of the graphene, the transmission of photoproduction electrons in the film is improved; and the photoelectric degrading efficiency is obviously improved by applying a thin film material to an organic material degradation field. The thin film electrode loaded with a composite structure catalyst can be recycled and can be repeatedly used for a plurality of times, so that the secondary pollution to the water quality is avoided in a water treatment process. The method provided by the invention has the advantages of high efficiency and low cost. The method provided by the invention can be used for purifying and treating the organic matters in industrial wastewaterand city domestic sewage.

Description

technical field [0001] The invention belongs to the technical fields of inorganic non-metallic materials and pollutant treatment, and specifically relates to the application of a modified thin-film electrode material in the field of photoelectric catalytic degradation of organic matter. In particular, it relates to the application of a graphene / titanium dioxide composite structure film electrode in the field of photocatalytic degradation. Background technique [0002] Semiconductor-based photocatalytic technology has attracted increasing attention in environmental protection due to its outstanding advantages such as low energy consumption, simple process, and mild reaction conditions. Among the various semiconductor materials studied, TiO 2 Due to its stability, non-toxicity, controllable structure and morphology, and low price, it has become the most widely studied catalyst. In general, photocatalytic degradation of organic pollutants is carried out in a suspension system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/46
Inventor 陶霞王东亭陈建峰
Owner BEIJING UNIV OF CHEM TECH
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