Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal
Magnetic chitosan-GO nanocomposite: Synthesis, characterization and batch adsorber design for Cr(VI) removal
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DOI：
10.1016/j.jece.2014.03.012
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发表时间：
2014-06-01
影响因子：
7.7
通讯作者：
Pillay, Kriveshini
中科院分区：
文献类型：
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作者：
Debnath, Sushanta;Maity, Arjun;Pillay, Kriveshini
合成了磁改性氧化石墨烯-壳聚糖复合材料并用于去除铬（VI）。通过BET、SEM、TEM、XRD和FTIR对复合材料进行了表征。最适 pH 值为 3.0 (+/- 0.1)。薄膜扩散和伪二阶方程控制着整体动力学。 Langmuir 和 Redlich-Peterson 等温线描述了实验数据。负Delta G 度（-15.49 至-15.67 kJ mol(-1)）和正Delta H 度（11.29 kJ mol(-1)）表明自发和吸热反应。最佳再生溶液为 0.05 M NaOH，废吸附剂可重复使用至第 5 次再生循环，其中复合材料保留其原始吸附能力的 92%。建议使用单级间歇式吸附器去除浓度高达 0.05 mg L-1 的 Cr(VI)。 (C) 2014 Elsevier Ltd. 保留所有权利。
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.