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摘要: 多壁碳纳米管采用H2SO4, KMnO4, HNO3氧化处理后用于铊吸附研究。碳纳米管经处理后表面官能团增加，采用Bohmn滴定法确定了样品的表面官能团的量。当用于吸附铊时，氧化处理显著提高了其吸附能力。采用Langmuir方程进行拟合处理后获得原始碳纳米管、H2SO4, KMnO4, HNO3氧化处理后样品的吸附量分别为3.0, 11.7, 21.6 and 31.55 mg/g。HNO3处理后具有对铊最佳的吸附性能。Abstract: Multiwall carbon nanotubes (MWCNTs) oxidized by H2SO4, KMnO4, and HNO3 were used as sorbents and their sorption abilities for Tl(III) were compared with raw MWCNTs. The Langmuir model was used for the calculation of the amount of Tl(III) sorbed on the surface of MWCNTs. The acidic oxidation treatment of MWCNTs yielded a large number of functional groups, leading to a sharp increase in Tl(III) adsorption. Maximum adsorption of Tl(III) was recorded at a pH value of 7. The maximum amounts of Tl(III) sorbed on raw MWCNTs, H2SO4-oxidized, KMnO4-oxidized and HNO3-oxidized MWCNTs calculated by the Langmuir model were 3.0, 11.7, 21.6 and 31.5 mg/g, respectively. The MWCNTs oxidized by HNO3 showed the best sorption performance for Tl (III) ions.
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Key words:
- Thallium /
- Multiwalled carbon nanotubes /
- Adsorption /
- Oxidation
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