摘要
采用悬浮态光催化反应体系,以氙灯为光源,自制纳米 TiO_(2-x)N_x 为催化剂,考察了苯甲酸光催化氧化过程中 TiO_(2-x)N_x 质量浓度、反应体系初始 pH 和苯甲酸初始质量浓度对苯甲酸溶液中 TOC 去除率的影响。实验结果表明:最佳催化剂质量浓度为0.30g/L;TiO_(2-x)N_x 的等电点为 pH=5.3,在酸性条件下(pH=2.0)更有利于苯甲酸在催化剂表面的吸附,以及光生电子与 O_2反应生成·OH 的进行;随苯甲酸初始质量浓度增加,TOC 去除率降低,反应速率也相应地降低。TiO_(2-x)N_x比 P25型 TiO_2表现出更强的浓度适应能力。
The photocatalytic oxidation of benzoic acid was carded out in suspended photocatalytic reaction system using xenon lamp as light source, self-made TiO2-xNx as photocatalyst. The effects of TiO2-xNx mass concentration, initial reaction system pH, initial benzoic acid mass concentration on the removal of TOC were studied. The results show that： The optimal mass concentration of photocatalyst is 0.30 g/L; More benzoic acid is absorbed on the surface of TiO2-xNx and more hydroxyl radical is generated when the system pH is 2.0, because the isoelctric point of TiO2-xNx is pH 5.3 ; The removal rate of TOC and the reaction rate are decreased with the increasing of the initial mass concentration of benzoic acid. TiO2-xNx exhibits a higher photocatalytic activity than TiO2 of P25 type.
出处
《化工环保》
CAS
CSCD
北大核心
2008年第6期487-490,共4页
Environmental Protection of Chemical Industry
基金
东北电力大学博士科研启动基金资助项目(BSJXM-200710)
关键词
光催化氧化
二氧化钛
苯甲酸
photocatalytic oxidation
titanium dioxide
benzoic acid
