Heavy metal remediation by Dextrin-oxalic acid/Cetyltrimethyl ammonium bromide (CTAB) – Montmorillonite (MMT) nanocomposite

被引：13

作者：

Ahmad R. ^{[1
]}

Mirza A. ^{[1
]}

机构：

[1] Environmental Research Laboratory, Department of Applied Chemistry, Aligarh Muslim University, Aligarh, 202002, UP

来源：

Groundwater for Sustainable Development | 2017年 / 4卷

关键词：

Desorption; Isotherm; Kinetic; Nanocomposite; Thermodynamics;

D O I：

10.1016/j.gsd.2017.01.001

中图分类号：

学科分类号：

摘要：

The objective of the present study was to assess the suitability and efficiency of synthesized Dextrin-oxalic acid/CTAB-MMT nanocomposite for the removal of Pb(II) from aqueous solution. Batch adsorption studies have shown the maximum adsorption capacity (4.731 mg g−1) at pH 5.1, in 120 min and decreases with increasing temperature (303–323 K). The characterization of the nanocomposite was analyzed with SEM, EDX, TEM, FTIR, XRD, TGA, DTG. The experimental equilibrium data were tested by various isotherm models namely, Langmuir, Freundlich, Temkin, D-R, Halsey, Harkin-Jura, Scatchard models. The experimental data was best followed by Freundlich isotherm model, implying heterogeneous surface of nanocomposite with low error functions. The maximum adsorption capacity from Langmuir isotherm model was found to be 30.95 mg g−1. For kinetic study, Pseudo-first order, Pseudo-second order, Elovich and Intra-particle diffusion models were employed. Kinetic study was best described by Pseudo-second order model. The thermodynamic parameters namely, ΔG°, ΔH°, ΔS° revealed spontaneous, exothermic nature with increased randomness at solid-liquid interface during adsorption. Various experimental parameter studies proved chemisorption as the main mechanism behind the adsorption of Pb(II) on nanocomposite. Desorption with regeneration studies was carried with 0.1 M CH3COOH with regeneration capability upto sixth cycle. Therefore, the present nanocomposite could be applied to purify metal contained wastewater. © 2017 Elsevier B.V.

引用

页码：57 / 65

页数：8

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