缓冲溶液体系中光催化降解2,4-二氯苯酚废水的研究  

Research of Degradation of 2,4-Dichlorophenol by Photocatalysis in Buffer Solution

作　　者：王磊[1] 张玮[1] 宋国君[1] 朱建杰[1] 彭智[1] 

机构地区：[1]青岛大学化学科学与工程学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2014年第4期27-30,53,共5页Journal of Qingdao University(Natural Science Edition)

摘　　要：研究了2,4-二氯苯酚(DCP)光降解过程中pH的变化及其对DCP紫外-可见吸光度的影响。采用Na2CO3-NaHCO3和硼酸-硼砂两种弱碱性缓冲溶液体系消除了降解过程中pH变化的影响。与pH为3的酸性溶液体系对比表明,DCP在pH为9的缓冲溶液中具有较高的DCP去除率和催化效率,其中Na2CO3-NaHCO3体系光催化降解反应速率常数是酸性条件的2倍。2,4-dichlorophenol （DCP） is decomposed in the presence of TiO2 suspensions by illumination. The change of pH value in photocatalytic degradation of 2,4-dichlorophenol （DCP）, and the effect of this change to UV-Vis absorbance spectrum of DCP have been investigated. Buffer solution with Na2 CO3-NaH-CO3 or boric acid- borax is used to eliminate this effect. It can be observed that removal efficiency of DCP is significantly higher at pH= 9 than that at pH= 3, and the reaction rate is almost twice as fast as that at acidic environment.

关 键 词：2 4-二氯苯酚 光催化 PH值 缓冲溶液 

分 类 号：X592[环境科学与工程—环境工程] O643.32[理学—物理化学]