吸附-光催化法用于降解室内VOC的研究进展

Research progress on degradation of indoor VOC by using adsorption-photocatalytic method

吸附-光催化法因其高效、便捷、无污染等特点,在室内挥发性有机物(VOC)治理领域拥有着广阔的应用前景。本文介绍了吸附-光催化降解VOC机理;总结了近年来常用的固定化TiO_2的制备方法,以及各自的工艺流程、适用范围和存在的问题;综述了反应环境(风速、初始浓度、温度、相对湿度)对吸附-光催化降解率的影响。分析表明,在选择TiO_2固定化工艺时,应当根据吸附剂基材的表面基团、孔隙结构和亲疏水性等特征合理经济地确定制备方法;在探讨反应环境对室内VOC降解率的影响规律时,应综合考虑VOC自身特性和反应器类型等实验条件以得到不同条件下的最佳环境参数。最后指出,低温成膜的制备方法以及对反应环境如何影响低浓度多组分VOC降解的研究将成为今后的发展趋势。

Adsorption-photocatalytic method has a broad application prospect in the field of indoor VOC control due to its high efficiency, convenience, non-pollution, etc. In this paper, adsorption-photocatalytic degradation mechanism of VOC is introduced. Commonly used preparation methods of immobilized TiO_2 in recent years,as well as each technological process,application scope and existing problems are summarized. Meanwhile,the influences of reaction environment（wind velocity, initial concentration, temperature, relative humidity） on adsorption-photocatalytic degradation rate are reviewed. Analysis shows that one should reasonably and economically determine preparation method according to adsorbent substrate＇s surface groups, pore structure and hydrophilic-hydrophobic property when choosing TiO_2 immobilization technology,comprehensively consider self-characteristics of VOC,reactor type and other experimental conditions to get the best environmental parameters under different conditions when discussing the influence law of reaction environment on degradation rate of indoor VOC. Finally,it is pointed out that low-temperature membrane preparation methods and studies on how reaction environment affects VOC degradation of low concentration and multi-components will become the development trend in the future.