摘要
以高压荧光汞灯为光源,以自制Zn1-xFexO为催化剂,研究了悬浆体系中硝基苯污染废水的降解过程及降解规律。考察了硝基苯初始质量浓度、Zn1-xFexO光催化剂的质量浓度、Fe与Zn摩尔比值以及反应温度、pH、反应时间对硝基苯降解过程的影响。结果表明:以Zn1-xFexO作为催化剂可以有效地去除废水中的硝基苯,同时硝基苯的光催化降解过程符合一级反应动力学模型;反应活化能为9.3 k J·mol-1;当Zn0.99Fe0.01O的质量浓度为0.8 g·L^(-1)(Fe/Zn摩尔比为1∶99)、在125 W高压荧光汞灯照射下、硝基苯的初始浓度为400 mg·L^(-1)、反应温度为30℃、pH为3.27、取样时间为4 h时,硝基苯废水的反应速率常数和去除率分别为0.0136 min-1和98.88%;硝基苯的去除率和反应速率常数与Zn0.99Fe0.01O的质量浓度、Fe/Zn掺杂比例以及硝基苯初始浓度、溶液pH、反应温度等因素有关;同时,自制的Zn0.99Fe0.01O催化剂显著降低了反应活化能,从而提高了硝基苯污染废水的光降解效果。
Photocatalytic degradation of nitrobenzene in wastewater by Fe-doped nanostructured ZnO suspended system was studied under a high voltage fluorescence mercury lamp. Effects of initial concentration of nitrobenzene, mass concentration of Zn1-xFex-O, ratio of amount of substance between Zn and Fe, reaction temperature, initial pH and photodegradation time were investigated. The results showed that the removal of nitrobenzene was effective, the rate of photodegradation in aqueous solution followed firstorder kinetics, and activation energy （Ea） was 9.3 kJ·mol-1. When mass concentration of Zn1-xFex-O was 0.8 g·L-1 （the molar ratio of Zn and Fe was 1∶99）, the first order photodegradation rate constant of nitrobenzene （initial concentration was 400 mg·L-1, reaction temperature was 30 ℃, reaction pH was 3.27） was 0.0136 min-1, irradiated by a 125 W high voltage fluorescence mercury lamp in wastewater. The photodegradation rate constant of nitrobenzene was related to the influential factors mentioned above. More-over, the catalyst Zn0.99Fe0.01-O prepared by us significantly lowered activation energy and improved the effect of the photodegradation of nitrobenzene in contaminated wastewater.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第4期1072-1078,共7页
Chinese Journal of Ecology
基金
沈阳市科技计划项目(F16-205-1-12)
中国科学院地球化学研究所开放基金项目资助
关键词
硝基苯
光催化
光解速率常数
复合材料
活化能
nitrobenzene
photocatalysis
photolysis rate constant
composite material
activa-tion energy.
作者简介
臧淑艳，女，1973年生，博士研究生，副教授，主要研究方向为有机污染废水的治理技术与机理的研究。E—mail：zangshuyan@126．com
通讯作者E·mail：lianbinshenyang@126．com
