Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal

被引：122

作者：

Debnath, Sushanta ^{[1
]}

Maity, Arjun ^{[2
,3
]}

Pillay, Kriveshini ^{[1
]}

机构：

[1] Univ Johannesberg, Dept Appl Chem, Johannesburg, South Africa

[2] CSIR, Smart Polymers Grp, Mat Sci Mat Sci & Mfg, Pretoria, South Africa

[3] Univ South Africa UNISA, Dept Civil & Chem Engn, Pretoria, South Africa

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2014年 / 2卷 / 02期

基金：

新加坡国家研究基金会;

关键词：

Magnetic chitosan graphene composite; Chromium(VI); Kinetics; Isotherm; Regeneration; Single stage batch adsorber;

D O I：

10.1016/j.jece.2014.03.012

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 [工学]; 0830 [环境科学与工程];

摘要：

A magnetically modified graphene oxide-chitosan composite was synthesized and exploited for removal of chromium(VI). The composite material was characterized by BET, SEM, TEM, XRD and FTIR. The optimum pH was 3.0 (+/- 0.1). Film diffusion and pseudo-second-order equation governs the overall kinetics. Langmuir and Redlich-Peterson isotherms describe the experimental data. Negative Delta G degrees (-15.49 to-15.67 kJ mol(-1)) with positive Delta H degrees (11.29 kJ mol(-1)) indicated spontaneous and endothermic reaction. Optimum regenerate solution is 0.05 M NaOH and spent adsorbents could be reused up to 5th cycle of regeneration, where the composite retained its adsorption capacity 92% of its original. A single stage batch adsorber is proposed for removal of Cr(VI) concentration up to 0.05 mg L-1. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：963 / 973

页数：11

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