A Z-type catalyst with photothermal synergy and its application

Abstract

The invention discloses a Z-type catalyst with photothermal synergy and its application. It is composed of SrTiO 3 ,TiO 2 Nanotube array, AgBr and Ag form Z-type AgBr / Ag / SrTiO 3 -TiNT catalyst. The catalyst can be used in photothermal synergistic catalysis, can obtain higher catalytic activity at lower reaction temperatures, and has good thermal stability for easy reuse. AgBr / Ag / SrTiO 3 ‑TiNT uses the noble metal Ag as the electron transporter to form a Z-shaped catalyst, which effectively promotes the separation of photogenerated electron-hole pairs and the migration of electrons in the catalyst, showing a broad spectral response and high photogenerated carrier separation efficiency. Improved catalyst stability and redox capacity. The catalyst has simple preparation conditions, low cost and is suitable for industrial 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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