共 58 条
Adsorption of Cu(II) on Oxidized Multi-Walled Carbon Nanotubes in the Presence of Hydroxylated and Carboxylated Fullerenes
被引:48
作者:
Wang, Jing
[1
]
Li, Zhan
[2
]
Li, Shicheng
[3
]
Qi, Wei
[1
]
Liu, Peng
[1
]
Liu, Fuqiang
[1
]
Ye, Yuanlv
[1
]
Wu, Liansheng
[1
]
Wang, Lei
[1
]
Wu, Wangsuo
[1
]
机构:
[1] Lanzhou Univ, Radiochem Lab, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou, Peoples R China
[3] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang, Peoples R China
来源:
基金:
中国国家自然科学基金;
关键词:
AQUEOUS-SOLUTION;
SPHERICAL AROMATICITY;
ACTIVATED CARBONS;
METAL-IONS;
REMOVAL;
SORPTION;
COPPER;
RAMAN;
ACID;
PRECONCENTRATION;
D O I:
10.1371/journal.pone.0072475
中图分类号:
O [数理科学和化学];
P [天文学、地球科学];
Q [生物科学];
N [自然科学总论];
学科分类号:
07 ;
0710 ;
09 ;
摘要:
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.
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页数:11
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