作　　者： ; ; ; ; ; ; ;

机构地区： 暨南大学生命科学技术学院化学系

出　　处： 《精细化工》 2005年第4期290-293,共4页

摘　　要： 选择H3PW12O40 (HPW )、H2O2、KBrO3 作为电子受体,研究了多种条件(溶液的pH,甲基橙的吸附,电子受体浓度)对TiO2 光催化降解甲基橙反应速率的影响。结果表明,TiO2 光催化剂吸附甲基橙的能力随着pH的升高而降低;较高或较低pH有利于光催化降解甲基橙;甲基橙的光催化反应速率明显受到反应体系中共存的电子受体的影响,反应速率随电子受体接受电子能力增加而增大。当HPW、H2O2、KBrO3 的浓度分别为 0 06、0 24、0 1mol/L时,相应的拟一级速率常数k最大值分别为 0 191、0 338、2 20min-1,是未加入电子受体时的2 7倍、4 7倍和 31倍。 H_3PW_(12)O_(40),H_2O_2 and KBrO_3 were used as electron acceptors and their effect on the rate of TiO_2 photocatalytic degradation was examined.Effect of other factors such as pH value and adsorption behavior on the kinetics of photocatalytic degradation of methyl orange (MO) in TiO_2 suspension were also studied.The results show that the adsorbability of MO on TiO_2 decreases with increasing pH value;the photodegradation rate of MO is accelerated at higher or lower pH value;addition of electron acceptors significantly enhances the photodegradation rate of MO,and their ability to accept electron is consistent with the photocatalytic degradation activity.In our study,the maximum pseudo-first-order degradation rate constants are k_(H_3PWO_(40))=0.191 min^(-1),k_(H_2O_2)=0.338 min^(-1) and k_(KBrO_3)=2.20 min^(-1) when the concentrations of the electron acceptors are 0.06,0.19and 0.1 mol/L,respectively.These rate constants are respectively 2.7,4.7 and 31 times the value without electron acceptor.

关 键 词： 二氧化钛 电子受体 光催化 甲基橙

领　　域： [化学工程]