中文摘要：

采用H2SO4-HNO3混酸对多壁碳纳米管（MWCNTs）进行氧化处理,并详细研究了氧化后碳纳米管（OCNTs）对水中汞（Ⅱ）的吸附性能。结果表明,经氧化后的OCNTs对汞（Ⅱ）的最大吸附容量从氧化前的16.7 mg/g增至147 mg/g;溶液pH值对OCNTs的吸附性能有显著影响,最佳吸附pH值范围为3～6,较低或较高的pH值均会抑制OCNTs对汞（Ⅱ）的吸附性能;同时氯离子的存在也会抑制汞（Ⅱ）的吸附。

英文摘要：

Multiwalled carbon nanotubes（MWCNTs） were oxidized by mixing sulfuric acid and nitic acid and the adsorption properties of the oxidized product（OCNTs） for Hg（Ⅱ） were examined.Results showed that the maximum adsorption capacity of OCNTs substantially increased from 16.7 mg/g to 147 mg/g.Solution pH had a major impact on Hg（Ⅱ） adsorption by OCNTs and optimal adsorption happened at pH 3~6.Existence of chloride ions decreased Hg（Ⅱ） adsorption because of the formation of aqueous Hg-Cl complex.