Ternary composite octahedrite type titanium dioxide photocatalyst and preparation process thereof

Abstract

The invention relates to a method for preparing ternary compound anatase titania photocatalyst. Wherein, it uses magnetic nanometer particle sol and active carbon whose mass ratio is 1:1-1:9; then puts the active carbon into magnetic nanometer particle sol, to be mixed; therefore, the magnetic nanometer particles are adsorbed by the active carbon; then separating them via magnetic field to be dried at 40-80Deg. C, to obtain magnetic active carbon whose carrier is titania; then emerging the magnetic active carbon in anatase titania sol, to make the mass ratio between the magnetic active carbon and anatase titania 1:1-1:5; mixing for 0.5 hour and evaporating the suspension into powder; said powder is the final compound photocatalyst. The invention can prepare porous active carbon with high adsorption ability.

Description

Technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a ternary composite anatase TiO 2 Photocatalyst and its preparation method. Background technique [0002] Since Fujishima and Honda reported anatase TiO in Nature magazine in 1972 2 Since photoelectrodes can produce hydrogen by hydrolysis, the rapid charge separation and redox reactions induced by semiconductor materials based on the wide band gap under light have attracted widespread attention in the research and application of photocatalytic oxidation of organic wastewater. Among them, nano TiO 2 It has the advantages of resistance to chemical and light corrosion, stable properties, non-toxic, high catalytic activity, fast reaction speed, non-selective degradation of organic matter, easy to make it completely mineralized, and no secondary pollution. It is generally regarded as the most promising application catalyst of light. TiO 2 There are three crystal types of ...

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Problems solved by technology

However, since the activated carbon used as a carrier is micron-sized, although the recovery process reduces TiO 2 The loss and waste of the catalyst still need to be filtered and separated, which still requires a lot of manpower and material resources

[0004] In order to simplify the separation process of catalysts, some researchers used nano-TiO 2 A magnetic composite photocatalyst with a core-shell structure is loaded on magnetic particles, and the composite catalyst can be easily separated from the treated wastewater system by means of an external magnetic field, but there is a problem that the photocatalytic performance of the composite photocatalyst is reduced. up

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