摘要
为了考查氧化剂高锰酸钾吸收气体态元素汞Hg0的行为,在鼓泡反应器中,通过改变各种影响因素,采用冷原子吸收(CVAA)测汞仪测定了反应器进口和出口的气态汞浓度.系统地研究了高锰酸钾初始浓度、pH值、汞初始度和反应温度等主要参数对气态汞去除效率的影响,并分析了KMnO4氧化Hg0的反应热力学和传质-反应动力学问题.研究结果表明,高猛酸钾初始浓度的增加、强酸或强碱条件均有利于Hg0的去除,H2SO4的存在促进了Hg0在MnO2上的吸附,而强碱水溶液中产生的OH间接氧经了Hg0;反应温度的升高抑止了Hg0的去除,而Hg0初始质量浓度对反应的影响可忽略;KMnO4氧化Hg0的反应为二级反应,活化能为27.22 kJ/mol.
The conditions for potassium permanganate oxidizing gaseous mercury were examined. Gaseous mercury concentration at the inlet and outlet of a bubble column reactor was measured by cold vapor atom absorption （CVAA） mercury analyzer. The effects of KMnO4 concentration, pH value, initial Hg^0 concentration and temperature on Hg^0 removal efficiency were investigated, as well as the thermodynamics and mass transfer-reaction between Hg^0 and KMnO4. The results showed that both increasing the KMnO4 concentration and using acidic or alkaline solution promoted the removal of Hg^0. The reasons are that H2 SO4 in solution facilitates the adsorption of Hg^0 on MnO2, and that free radical OH produced in alkaline solution can oxidate Hg^0. High temperature has a negative effect on the removal of Hg^0 , and the effect of Hg^0 initial concentration can be neglected. The oxidation of Hg^0 by KMnO4 is a two-order reaction and the acti- vated energy is 27.22 kJ/mol.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第5期831-835,870,共6页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(20476094)
关键词
高锰酸钾
气态汞
吸收
传质-反应
potassium permanganate
gaseous mercury
absorption
mass transfer-reaction
作者简介
叶群峰（1977-），男，浙江金华人，博士生，主要从事大气汞污染控制研究．E—mail：qunfengye@163．com通讯联系人：徐新华，男，教授，博导．E—mail：xuxinhua@zju．edu．cn
