Photochemical preparation method of single atom Au for catalytic degradation of VOCs

Abstract

The present invention discloses a photochemical preparation method of a single atom Au for catalytic degradation of VOCs, and the method includes following steps: step 1, preparation of TiO2 nano-sheets in thickness of atomic scale: (a) adding TiCl3 and ethylene glycol to a reactor, and performing mechanic stirring; (b) filtering a liquid obtained after the above reaction by centrifugation, and then drying separated sediments to remove water; (c) grinding the dried solid, and conducting screening to obtain nano-powder of TiO2; and step 2, loading the single atom Au by a photochemical method. The single atom Au catalyst prepared by the method has high treatment efficiency in processes of plasma catalytic degradation of VOCs (the toluene removal rate is 98.4% and the dichloromethane removal rate is 98.2%). The single atom Au catalyst has long service life (after being used for 200 hours, the removal rate of the single atom Au catalyst on toluene and dichloromethane can reach 94.9% and 97.4%, respectively).

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for preparing single-atom Au that catalyzes and degrades VOCs waste gas in a plasma system. Background technique [0002] Volatile organic compounds VOCs (Volatile Organic Compounds) are an important class of air pollutants, defined by the World Health Organization as organic compounds with a boiling point of 50-260°C and a saturated vapor pressure of more than 133Pa at room temperature, including alkanes, alkenes, aromatics and their Derivatives, alcohols, aldehydes and ketones, amines and amides, acids and anhydrides, etc. VOCs are an important air pollutant, which is very harmful to the human body, can cause various discomforts to the human body, and is toxic and irritating. Many VOCs are known to have neurotoxicity, kidney and liver toxicity, and even carcinogenicity, which can damage the cardiovascular system, cause gastrointestinal disorders, induce immune sy...

AI Technical Summary

Problems solved by technology

[0004] Patent No. CN105478136A discloses a catalyst for synergistic low-temperature plasma catalytic degradation of industrial organic waste gas and its preparation method and application. The carrier used is SiC, and the main active ingredient is at least one of noble metals and at least one of transition metal oxides. A mixture of species, the promoter component is a mixture of at least one rare earth metal oxide and at least one alkaline earth metal oxide, the catalyst has low price, long life, and can be combined with plasma to remove VOCs at room temperature with high efficiency, but The content of VOCs in the experiment is low, and the ability of the catalyst to degrade VOCs with medium and high concentrations remains to be investigated

Single-atom catalyst is a new type of catalyst. The low loading and high treatment efficiency make single-atom catalyst have great application prospects. However, there is no report on the patent of single-atom catalyst for catalytic degradation of VOCs.

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