Adsorption of Cu(II) on Oxidized Multi-Walled Carbon Nanotubes in the Presence of Hydroxylated and Carboxylated Fullerenes

作者：Wang, Jing; Li, Zhan; Li, Shicheng; Qi, Wei; Liu, Peng; Liu, Fuqiang; Ye, Yuanlv; Wu, Liansheng; Wang, Lei; Wu, Wangsuo^*

来源：PLos One, 2013, 8(8): e72475.

DOI：10.1371/journal.pone.0072475

• AQUEOUS-SOLUTION
• SPHERICAL AROMATICITY
• ACTIVATED CARBONS
• METAL-IONS
• REMOVAL
• SORPTION
• COPPER
• RAMAN
• ACID
• PRECONCENTRATION

The adsorption of Cu(II) on oxidized multi-walled carbon nanotubes (oMWCNTs) as a function of contact time, pH, ionic strength, temperature, and hydroxylated fullerene (C-60(OH)(n)) and carboxylated fullerene (C-60(C(COOH)(2))(n)) were studied under ambient conditions using batch techniques. The results showed that the adsorption of Cu(II) had rapidly reached equilibrium and the kinetic process was well described by a pseudo-second-order rate model. Cu(II) adsorption on oMWCNTs was dependent on pH but independent of ionic strength. Compared with the Freundlich model, the Langmuir model was more suitable for analyzing the adsorption isotherms. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that Cu(II) adsorption on oMWCNTs was spontaneous and endothermic. The effect of C-60(OH)(n) on Cu(II) adsorption of oMWCNTs was not significant at low C-60(OH)(n) concentration, whereas a negative effect was observed at higher concentration. The adsorption of Cu(II) on oMWCNTs was enhanced with increasing pH values at pH < 5, but decreased at pH >= 5. The presence of C-60(C(COOH)(2))(n) inhibited the adsorption of Cu(II) onto oMWCNTs at pH 4-6. The double sorption site model was applied to simulate the adsorption isotherms of Cu(II) in the presence of C-60(OH)(n) and fitted the experimental data well.

• 出版日期2013-8-29
• 单位中国工程物理研究院核物理与化学研究所; 兰州大学; 中国工程物理研究院; 中国科学院近代物理研究所