Sorption of Ni2+ on Na-rectorite studied by batch and spectroscopy methods

被引：126
作者：
Tan, Xiaoli [1 ]
Chen, Changlun [1 ]
Yu, Shaoming [2 ]
Wang, Xiangke [1 ]
机构：
[1] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
[2] Hefei Univ Technol, Sch Chem Engn, Hefei 230009, Peoples R China
来源：
APPLIED GEOCHEMISTRY | 2008年 / 23卷 / 09期
关键词：
D O I：
10.1016/j.apgeochem.2008.07.008
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Sorption of Ni2+ on Na-rectorite as a function of contact time, temperature, pH and fulvic acid (FA)/humic acid (HA) was studied under ambient conditions. A pseudo-second-order rate equation was used to simulate the kinetic sorption. The removal of Ni2+ increased with increasing pH. The presence of FA/HA enhanced the sorption of Ni2+ at low pH values, whereas no drastic effect of FA/HA on Ni2+ uptake to rectorite was found at high pH values. The diffuse layer model (DLM) fitted the experimental data of Ni2+ sorption in the absence and presence of FA/HA very well with the aid of FlTEQL 3.2. The Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were used to simulate the sorption isotherms of Ni2+ at different temperatures. The thermodynamic data (AW, ASO, AGO) were calculated from the temperature dependent sorption isotherms and the results suggested that the sorption process of Ni2+ on rectorite was spontaneous and endothermic. The sorption and species of Ni2+ on rectorite in the presence and absence of FA/HA was also investigated and characterized by XPS. The spectroscopic analysis indicated no drastic structural changes of Na-rectorite and the sorption of Ni2+ mainly occurred on the surface and at the edge position of Na-rectorite. (c) 2008 Elsevier Ltd. All rights reserved.
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页码：2767 / 2777
页数：11
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