Method for preparing organic pollutant-degrading electrode material

Abstract

The invention relates to the technical field of electrochemistry and relates to a method for preparing an organic pollutant-degrading electrode material. The prepared electrode material for degrading the organic pollutant CO has a cladding structure in which a titanium matrix, a tantalum interlayer and a diamond film are clad in sequence, wherein the surface of the titanium matrix is clad with the tantalum interlayer which is in closed fit with the matrix; the boron-doped diamond film is deposited on the outside of the tantalum interlayer; the titanium matrix has a purity mass percentage of no less than 99 percent and the thickness of the composite tantalum interlayer is 1 mu m so as to protect the titanium matrix, restrain the growth of titanium carbide (TiC) and prolong the service life of the electrode; and the resisitivity of the boron-doped diamond film is 10<9> to 10<12> omega.cm, and a conductive diamond film electrode is prepared by controlling the doping amount of boron. The method has the advantages that: the process is simple, safe and reliable; the prepared electrode material has high cost performance, a wide potential window and a high degradation effect; the diamond film is not easy to drop in an electrolytic process by settling the tantalum interlayer; and the diamond film electrode has high stability.

Description

Technical field: [0001] The invention belongs to the technical field of electrochemistry and relates to a preparation method of a novel electrode material for degrading organic pollutants. The electrode material prepared by the method is suitable for electrochemical treatment of toxic and refractory organic pollutant wastewater with high concentration. Background technique: [0002] With the rapid development of industry, the number and types of chemically synthesized organic substances entering the water body have increased sharply, resulting in the characteristics of high organic content, complex components, poisonous and harmful, and difficult biodegradation in wastewater, resulting in serious pollution of water resources. human survival and development. The current sewage treatment technologies mainly include physical treatment, chemical treatment and biological treatment. These treatment methods have their own advantages, but also have some shortcomings. Especially for...

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Problems solved by technology

The Chinese invention patent with the publication number CN 1336334A describes that a boron-doped diamond film electrode with a polished silicon wafer as a substrate is used to treat wastewater, and the treatment effect is good, but silicon has disadvantages such as poor mechanical properties and low electrical conductivity.

The literature (Gao Chengyao et al., Ta / BDD film electrode electrochemically catalyzes the oxidation of nitrophenol, Acta Physicochemical Society, 2008, Vol 24, No 11, 1988) introduces a boron-doped diamond film electrode with a tantalum (Ta) substrate, It has a wide potential window and good stability, but the high price of Ta metal is difficult to make it widely used

In comparison, titanium (Ti) has the advantages of low price and high mechanical strength, literature (F.Beck, W.Kaiser, H.Krohn, Boron doped diamond (BDD)-layers ontitanium substrates as electrodes in applied electrochemistry, Electrochimica Acta , 2000, 45: 4691) used boron-doped diamond film electrodes as substrates for wastewater treatment, showing a good degradation effect, but the literature (Huo Sitao, Research on the preparation of boron-doped titanium-based diamond film electrodes, 2006, Tianjin Institute of Technology University) conducted accelerated life tests on titanium-based diamond film electrodes, and found that the presence of the TiC layer caused the diamond film to fall off, shortening its service life

To sum up, the existing electrode materials used in wastewater treatment and their preparation processes generally have complex processes, inconvenient condition control, and the prepared materials have poor mechanical properties, low electrical conductivity, poor stability, short service life, and narrow potential window. , low degradation performance and other outstanding shortcomings

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