| 表面活性剂对多壁碳纳米管吸附Pb~(2+)的影响 |
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| 引用本文： | 许乾慰,陈丽丽.表面活性剂对多壁碳纳米管吸附Pb~(2+)的影响[J].环境污染与防治,2009,31(3). |
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| 作者姓名： | 许乾慰 陈丽丽 |
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| 作者单位： | 1. 同济大学材料科学与工程学院,上海200092;先进土木工程材料教育部重点实验室,上海,200092
2. 同济大学材料科学与工程学院,上海,200092 |
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| 摘 要： | 多壁碳纳米管(MWNT)在吸附有毒气体和重金属离子方面具有极高的应用价值.针对MWNT对水溶液中Pb2+的净化吸附进行了研究,从吸附量,吸附速率、动力学角度考察了表面活性剂、Pb2+浓度对MWNT吸附Pb2+的影响.结果表明,司班-60、吐温-20、阿拉伯树胶等表面活性剂的加入,促进了MWNT在溶液中的分散,导致在Pb2+摩尔浓度为3～18 mmol/L的Lang-muir和Freundlich等温吸附方程中的吸附常数(K)变大,使得MWNT对Pb2+的吸附速率和平衡吸附量都得到提高;随着溶液中Pb2+浓度的增大,MWNT对其吸附量渐至饱和,随后由于Pb2+的位阻作用.吸附量下降;在这3种表面活性剂中,由于司班-60具有相对较小的分子量,其分散的MWNT在Pb2+摩尔浓度为14 mmol/L时,吸附量最大,为230 mg/g.
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| 关 键 词： | 碳纳米管 表面活性剂 吸附 铅离子 |
Effect of surfactant on adsorption of Pb~(2+) on multi wall carbon nanotubes |
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| Xu Qianwei,Chen Lili.Effect of surfactant on adsorption of Pb~(2+) on multi wall carbon nanotubes[J].Environmental Pollution & Control,2009,31(3). |
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| Authors: | Xu Qianwei Chen Lili |
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| Affiliation: | 1.School of Material Science and Engineering;Tongji University;Shanghai 200092;2.Key Laboratory of Advanced Civil Engineering Materials;Shanghai 200092 |
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| Abstract: | Carbon nanotubes adsorbent(MWNT) is useful for removing toxic gas and heavy metal ions.Series of batch experiments were conducted for removing Pb2+ from aqueous solutions by adsorption on MWNT to determine the effects of surfactant and Pb2+ concentration on adsorptive capacity,adsorption rate and the kinetics.At a low equilibrium Pb2+ concentration,addition of any one of the surfactants studied(Span 60,Tween 20 and Arabia gum) improved MWNT dispersion and thus enhanced both the adsorptive capacity of MWNT f... |
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