Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers
Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers
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DOI：
10.1016/j.ijbiomac.2014.09.023
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发表时间：
2015-01-01
影响因子：
8.2
通讯作者：
Meenakshi, Sankaran
中科院分区：
文献类型：
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作者：
Karthik, Rathinam;Meenakshi, Sankaran
在本研究中，海藻酸钠-聚苯胺（SAP）纳米纤维作为吸附剂去除铬（VI）离子从水溶液中通过分批模式进行评估。利用FTIR、SEM、EDX和XRD等技术对SAP纳米纤维进行了表征。考察了pH值、投加量、助阴离子、接触时间和浓度等因素对Cr（VI）去除率的影响。FTIR、SEM和EDX分析结果表明，SAP纳米纤维对Cr（VI）离子有较好的去除效果。FTIR分析进一步证明了Cr（VI）离子与SAP纳米纤维之间存在静电相互作用。实验所得的平衡数据较好地符合Freundlich等温式而非Langmuir等温式。Q度、k（F）和热力学参数的值揭示了Cr（VI）去除过程的吸热性质。在303 K时，SAP纳米纤维对Cr（VI）离子的最大吸附量为73.34 mg g（-1）。动力学数据符合准二级动力学模型。解吸和再生实验表明，SAP纳米纤维可以重复使用超过三个连续的循环。(C)2014爱思唯尔有限公司版权所有。
In the present study, sodium alginate-polyaniline (SAP) nanofibers are evaluated as an adsorbent for the removal of Cr(VI) ion from aqueous solution by batch mode. The SAP nanofibers are characterized using FTIR, SEM, EDX and XRD techniques. The influences of various parameters such as pH, dosage, co-anions, contact time and concentration on Cr(VI) removal efficiency are investigated. The results of FTIR, SEM and EDX analysis reveals the removal of Cr(VI) ions by SAP nanofibers. Also, the existence of the electrostatic interaction between the Cr(VI) ions and SAP nanofibers is further proved by FTIR analysis. The equilibrium data obtained from the experiments are well fitted to the Freundlich isotherm than Langmuir isotherm. The values of Q degrees, k(F) and thermodynamic parameters reveal the endothermic nature of the Cr(VI) removal process. The Langmuir maximum sorption capacity of SAP nanofibers for Cr(VI) ion at 303 K is calculated to be 73.34 mg g(-1). The kinetic data are well expressed by pseudo-second-order model. Desorption and regeneration experiment shows that the SAP nanofibers can be reused for more than three successive cycles. (C) 2014 Elsevier B.V. All rights reserved.