Equilibrium studies on removal of lead (II) ions from aqueous solution by adsorption using modified red mud

被引:1
|
作者
S. Lakshmi Narayanan
G. Venkatesan
I. Vetha Potheher
机构
[1] Bharathidasan Institute of Technology (BIT) Campus,Department of Civil Engineering, University College of Engineering
[2] Anna University,Department of Physics, University College of Engineering
[3] Bharathidasan Institute of Technology (BIT) Campus,undefined
[4] Anna University,undefined
来源
International Journal of Environmental Science and Technology | 2018年 / 15卷
关键词
Batch studies; Heavy metal; Isotherm; Iron oxide; Kinetic models;
D O I
暂无
中图分类号
学科分类号
摘要
In the present experimental study, solid waste was used as an adsorbent and the effectiveness of the adsorbent was increased by novel treatment methods. Red mud, acid-treated activated red mud and iron oxide-coated acid-treated activated red mud were used for the removal of lead (II). The structural and functional groups were identified to confirm the removal of lead (II) by powder X-ray diffraction and Fourier transform infrared spectroscopy analyses. The enhancement of surface area was confirmed by Brunauer–Emmett–Teller analysis. Batch adsorption experiment was also conducted, and various parameters such as the effect of adsorbent dosage, pH, contact time and initial ion concentration were analyzed and reported. Adsorption equilibrium data were investigated using Langmuir, Freundlich and Dubinin–Radushkevich isotherm models with three parameters, and the rate of reaction was examined through kinetic models. The results indicate that in particular a novel modified form of red mud, namely iron oxide-coated acid-treated activated red mud was well fitted in lead (II) removal compared with reported adsorbents. The Langmuir isotherm shows that the maximum adsorption of adsorbate per gram was greater than other adsorbents (27.02 mg/g). In Freundlich isotherm, the Freundlich constant n values lie between 1 and 10 indicate the favorable adsorption. The calculated n values for normal red mud, acid-treated activated red mud and iron oxide-coated acid-treated activated red mud were found to be 1.9, 2.1 and 2.0 respectively. The correlation coefficient value was higher and the rate of reaction follows the pseudo-second-order kinetic model.
引用
收藏
页码:1687 / 1698
页数:11
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