酸化多壁碳纳米管对Pb(II)吸附的机理研究
Mechanism study on adsorption of acidified multiwalled carbon nanotubes to Pb(II).
作者信息
Wang Hongjuan, Zhou Ailin, Peng Feng, Yu Hao, Yang Jian
机构信息
School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510641, People's Republic of China.
出版信息
J Colloid Interface Sci. 2007 Dec 15;316(2):277-83. doi: 10.1016/j.jcis.2007.07.075. Epub 2007 Sep 14.
Adsorption of acidified multiwalled carbon nanotubes (MWCNTs) to heavy metal using Pb(II) as a model was investigated and characterized by many techniques. The main adsorption mechanism of acidified MWCNTs to Pb(II) is proposed on the basis of adequate analysis. The results show that the oxygenous functional groups can be formed on MWCNTs after MWCNTs were treated by concentrated nitric acid. The oxygenous functional groups play an important role in Pb(II) adsorption to form chemical complex adsorption, which accounts for 75.3% of all the Pb(II) adsorption capacity. The Pb(II) in the form of PbO, Pb(OH)(2), and PbCO(3) adsorbed on the surface of the acidified MWCNTs is only 3.4% of the total Pb(II) adsorption capacity. The Pb(II) species adsorbed on acidified MWCNTs mainly aggregate on the ends and at the defects sites on the acidified MWCNTs.
以铅（II）为模型，研究了酸化多壁碳纳米管（MWCNT）对重金属的吸附作用，并采用多种技术对其进行了表征。在充分分析的基础上，提出了酸化MWCNT对铅（II）的主要吸附机理。结果表明，MWCNT经浓硝酸处理后可在其表面形成含氧官能团。含氧官能团在铅（II）吸附形成化学络合吸附过程中起重要作用，占铅（II）总吸附量的75.3%。以PbO、Pb(OH)₂和PbCO₃形式吸附在酸化MWCNT表面的铅（II）仅占铅（II）总吸附量的3.4%。吸附在酸化MWCNT上的铅（II）物种主要聚集在酸化MWCNT的端部和缺陷部位。
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