纳米光催化剂降解室内微量苯类挥发性有机化合物

Degradation of benzene volatile organic compoundsby nano-photocatalyst

摘要:

社会的迅速发展给人类带来物质文明的同时,也使得环境污染变得日益严重,特别是在近年来由人类活动产生的气态污染物严重威胁到环境和人体健康。习近平总书记曾说过,绿水青山就是金山银山。但是,气态污染物相继排放到大气中,促使人们有必要开发出合适的技术来净化空气。苯类挥发性有机化合物(苯类VOCs)是室内空气中常见的气态污染物之一,应该经过物理吸附并转化成无危害的化合物等。光催化氧化技术(PCO)可以在光照作用下,利用光子的能量使光催化剂表面产生高活性物质来有效降解苯类VOCs,并且不会产生二次污染。目前,已有许多不同结构和物理化学性能的光催化体系被应用于降解苯类VOCs,本文首先对光催化降解苯类VOCs的基本原理、影响光催化反应的因素和提高降解效率的方法进行了系统分析,综述了各类纳米催化剂的设计理念以及其在光催化降解苯类VOCs过程中的性能,并对未来纳米催化剂的设计进行了展望。

Abstract:

While the rapid development of society has brought material civilization to human beings, environmental pollution has become increasingly serious, especially in recent years, gaseous pollutants produced by human activities have seriously threatened the environment and human health.SSSSHowever, the successive discharge of gaseous pollutants into the atmosphere makes it necessary to develop suitable technologies to clean the air.SSBenzene volatile organic compounds (benzene VOCs) is one of the common gaseous pollutants in indoor air, which should be transformed into non-hazardous compounds through physical adsorption.SSPhotocatalytic oxidation (PCO) can effectively degrade benzene VOCs by generating highly active substances on the surface of the photocatalyst using the energy of photons under the action of light, without secondary pollution.SSAt present, many photocatalytic systems with different structures and physical and chemical properties have been applied to degrade benzene VOCs. In this paper, the basic principle of photocatalytic degradation of benzene VOCs, factors affecting the photocatalytic reaction and methods to improve the degradation efficiency have been systematically analyzed.SSThe design concept of all kinds of nanocatalizers and their performance in photocatalytic degradation of benzene VOCs were reviewed, and the future design of nanocatalizers was prospected.