TiO_2光催化降解水中土臭素和2-甲基异莰醇研究进展

Progress in Photocatalytic Degradation of Geosmin and 2-Methylisoborneol in Water by TiO_2

土臭素和2-甲基异莰醇是饮用水中主要的臭味物质,TiO_2光催化降解技术是具前景的去除方法之一。文章重点介绍了影响光催化降解效率的各种因素,包括TiO_2的投加量、水体的pH值、光照强度、腐植酸、碳酸氢盐和醇类物质。光催化降解过程是通过·OH的存在得以实现的。目前光催化降解反应器主要有流化床和固定床两类,超滤膜无机一有机杂化光催化分离膜在臭味物质的去除中也有应用。这三种光催化降解技术去除率高,但源于各自的利弊端,还需进一步深人研究,选择最件的技术方法成为常规的净水技术。

Geosmin and 2-Methylisoborneol are the main compounds causing taste and odour problem in drinking water.Photocatalysis by TiO_2 is one of the promising technology for the treatment of taste and odour compounds in water. The influencing factors of photocatalytic degradation efficiency of taste and odour compounds are introduced, including TiO_2 load, pH, light intensity,humic acid, bicarbonates and alcohols. Photodegradation mechanism takes place via · OH radicals. The photocatalytic degradation reactors mainly include suspended TiO_2 system and immobilized TiO_2 system, and inorganic-organic hybrid photocatalytic separation membranes have been applied in the control of taste and odour compounds. The removal rate of these three kinds of photocatalytic degradation technology is high,but further research is needed to choose the best technology for conventional water purification due to their respective advantages and disadvantages.