Z-type catalyst with photothermal synergistic function and application thereof

Abstract

The invention discloses a Z-type catalyst with a photothermal synergistic function and application thereof. The Z-type catalyst AgBr / Ag / SrTiO3-TiNT consists of SrTiO3 (strontium titanat), TiO2 (titanium dioxide) nanotube array, AgBr (silver bromide) and Ag (silver). The Z-type catalyst can be applied to the photothermal synergistic catalyzing, higher catalyzing activity is obtained at lower reaction temperature, the good thermal stability is realized, and the repeated utilization is conveniently realized; the noble metal (Ag) is used as an electron transmitter to form the Z-type catalyst, so as to effectively accelerate the separating of photoelectron cavity pairs and transfer of electrons in the catalyst, showing the broader spectrum response and higher separating efficiency of photon-generated carriers, and improve the stability and oxidation-reduction ability of the catalyst. The Z-type catalyst has the advantages that the preparation conditions are simple, the cost is lower, and the Z-type catalyst is suitable for industrialized production.

Description

technical field [0001] The invention relates to a Z-type catalyst with photothermal synergistic effect and its application in photothermal synergistic degradation of organic gas pollutants, belonging to the technical field of catalytic materials and environmental protection. Background technique [0002] Volatile organic compounds (VOCs) can cause serious damage to human health and the environment. In recent years, technologies related to the degradation of VOCs mainly include photocatalysis and thermal catalysis. Among them, the core of photocatalytic technology is mainly to use photocatalyst to absorb light energy at room temperature to generate active groups, thereby catalytically degrading VOCs. However, due to its low utilization rate of light energy, low quantum efficiency and poor catalyst stability, it is difficult for this technology to be used in large-scale industrial production. Compared with photocatalytic technology, although thermocatalytic technology has hi...

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Problems solved by technology

[0004] Although the catalytic materials prepared by the above-mentioned methods reported in the literature have high catalytic performance, there are still some problems, such as SrTiO 3 / TiO 2 The synthesis process requires a long hydrothermal time, the cost is high and the operation is cumbersome, and ammonia gas is easily generated during the synthesis process to pollute the environment.

Although the heterojunction structure helps to inhibit the recombination of photogenerated electrons and holes, its redox ability is not very strong, and the external temperature has little effect on improving the catalytic performance of the material, which cannot reflect the advantages of photothermal synergistic catalysis. The catalytic effect of some refractory organic compounds is not good, such as benzene series VOCs

Although the Z-type catalyst AgI / Ag / AgBr has good catalytic activity, its Ag content is too high, the cost is high, and the catalyst has poor thermal stability, poor experimental repeatability, and is easily oxidized and deteriorated at high temperatures. Its applicability as a photothermal catalytic material is poor

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