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Biosorption of heavy metals from aqueous solutions by chemically modified orange peel

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成果类型:
期刊论文
作者:
Feng, Ningchuan;Guo, Xueyi*;Liang, Sha;Zhu, Yanshu;Liu, Jianping
通讯作者:
Guo, Xueyi
作者机构:
[Feng, Ningchuan; Liu, Jianping; Zhu, Yanshu] Ningxia Med Univ, Sch Basic Med Sci, Yinchuan 750004, Peoples R China.
[Guo, Xueyi; Liang, Sha] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China.
通讯机构:
[Guo, Xueyi] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Hunan, Peoples R China.
语种:
英文
关键词:
Modified orange peel;Heavy metal ions;Biosorption;Isotherms;Kinetics;Thermodynamics
期刊:
Journal of Hazardous Materials
ISSN:
0304-3894
年:
2011
卷:
185
期:
1
页码:
49-54
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:工程学;WOS学科类别:Engineering, Environmental;Environmental Sciences
入藏号:
WOS:000289446700008;EI:20104713418860
基金类别:
National Natural Science Foundation of China [50774100]
机构署名:
本校为通讯机构
院系归属:
材料科学与工程学院
摘要:
Equilibrium, thermodynamic and kinetic studies were carried out for the biosorption of Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup> ions from aqueous solution using the grafted copolymerization-modified orange peel (OPAA). Langmuir and Freundlich isotherm models were applied to describe the biosorption of the metal ions onto OPAA. The influences of pH and contact time of solution on the biosorption were studied. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. According to the Langmuir equation, the maximum uptake capacities for Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup> ions were 476.1, 293.3 and 162.6mgg<sup>-1</sup>, respectively. Compared with the unmodified orange peel, the biosorption capacity of the modified biomass increased 4.2-, 4.6- and 16.5-fold for Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup>, respectively. The kinetics for Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup> ions biosorption followed the pseudo-second-order kinetics. The free energy changes (&Delta;G&deg;) for Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup> ions biosorption process were found to be -3.77, -4.99 and -4.22kJmol<sup>-1</sup>, respectively, which indicates the spontaneous nature of biosorption process. FTIR demonstrated that carboxyl and hydroxyl groups were involved in the biosorption of the metal ions. Desorption of Pb<sup>2+</sup>, Cd<sup>2+</sup> and Ni<sup>2+</sup> ions from the biosorbent was effectively achieved in a 0.05molL<sup>-1</sup> HCl solution. &copy;2010 Elsevier B.V.

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