摘要
在鼓泡反应器中考察了高锰酸钾氧化单质汞(Hg0)的影响因素和机理,研究结果表明,KMnO4和Hg0的反应很快,去除率随KMnO4增加而增加;汞的进口浓度对汞的去除率影响不大;随pH值的升高汞的去除率先降低后增加,在强酸性(pH=0)下Hg0去除率最大,为92.4%,当pH值超过11随pH值的升高而增加。在不同酸碱体系中,Hg0和KMnO4反应过程是不同的。在酸性条件下H+提高了体系的氧化还原电势,同时生成的Mn2+对本反应具有自催化作用。中性及碱性条件下,除氧化Hg0外,KMnO4还原为MnO2对Hg0有吸附作用,在强碱性条件下KMnO4将OH-氧化成.OH从而使得自由基.OH氧化去除Hg0。
In the bubble reactor,the oxidation absorption of mercury by KMnO4 was studied.The results showed that the reaction of KMnO4 with Hg0 was fast,the removal of elemental mercury increased with the concentration of KMnO4 increasing.The pH value had a significant effect on the removal of mercury,which increased first and then decreased with pH value increasing.Under the conditions of strong acid the removal rate of Hg0 was 92.4%.The main mechanism of KMnO4 removing Hg0 depended on the strong oxidation of KMnO4.Under the acidic conditions,KMnO4 was reduced and produced Mn2＋ which had the self-catalytic effect for the reaction,under neutral and alkaline conditions,KMnO4 was reduced and produced MnO2 which can adsorb Hg0,and under strong alkaline conditions,radical ·OH was produced which oxidized the Hg0.
出处
《环境工程学报》
CAS
CSCD
北大核心
2011年第7期1613-1616,共4页
Chinese Journal of Environmental Engineering
基金
四川省科技厅公益基金项目(2007SGY032)
四川省教育厅重点培育项目(09ZZ003)
关键词
高锰酸钾
PH值
单质汞
氧化
吸收
KMnO4
pH
elemental mercury
oxidation
adsorption
