Preparation And Application Of Aldehydes Volatile Organic Compounds Treatment Materials

With the continuous growth of global population and the development of industry,air pollution has become a difficult problem to solved urgently.Aldehyde volatile organic compounds（VOCs）are the most common pollutant gases in the indoor environment,which pose a great threat to human health and safety.Therefore,the treatment of aldehydes in the indoor environment is critical.Among the various treatment technologies available,adsorption and photocatalytic oxidation are the most promising aldehyde treatment technologies for indoor applications with the advantages of low cost,high efficiency and long action time.In this paper,a phenolic hydroxyl modified activated carbon material with excellent acetaldehyde adsorption capacity and a CuAg/TiO₂catalyst with excellent acetaldehyde photodegradation were successfully prepared with the research object of aldehyde VOCs treatment materials.These two materials were applied to the treatment of aldehydes VOCs.The mechanism of photocatalytic degradation of acetaldehyde by CuAg/TiO₂was also studied.The main research contents and results are as follows:（1）A phenolic hydroxyl modified activated carbon was successfully prepared by esterification reaction.The material has excellent adsorption properties for acetaldehyde gas.When acetaldehyde concentration is 3μg/m L,the highest adsorption rate of dynamic acetaldehyde gas reaches62.46%.In addition,the effects of acetaldehyde concentration,gas flow rate,temperature,water content,propylene glycol content,glycerol content and tar content on the dynamic adsorption performance of acetaldehyde on activated carbon were also studied.（2）A CuAg/TiO₂photocatalyst was successfully prepared by hydrazine hydrate reduction method.The catalyst has excellent light response range and degradation performance of acetaldehyde gas.CuAg nanoparticles not only formed a strong absorption band at 510 nm through the surface plasmon resonance effect,but also a Schottky barrier at the interface with TiO₂,which effectively promoted the photoexcitation of electrons and holes.CuAg/TiO₂photocatalyst showed excellent degradation performance for acetaldehyde under visible light irradiation.Within 45 minutes,the degradation rate of acetaldehyde reached 98.36%.In addition,CuAg/TiO₂photocatalyst also showed well degradation activity under indoor LED light and outdoor natural light irradiation.After 4 hours of irradiation,the degradation rate of acetaldehyde under LED light and natural light reached 10.17%and 42.49%,respectively.