Removal and recovery of chromium from wastewater using short chain polyaniline synthesized on jute fiber
Removal and recovery of chromium from wastewater using short chain polyaniline synthesized on jute fiber
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DOI：
10.1016/j.cej.2007.11.004
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发表时间：
2008-07-15
影响因子：
15.1
通讯作者：
Ray, Manabendra
中科院分区：
文献类型：
--
作者：
Kumar, Potsangbam Albino;Chakraborty, Saswati;Ray, Manabendra
在本研究中，短链聚苯胺（PANI）是一种在黄麻纤维表面合成的聚合物，并用作去除六价铬（Cr（VI））的吸附剂。实验以批量模式进行，变量包括PANI上的黄麻纤维量、PANI的链长、溶液pH值、Cr(VI)的初始浓度、PANI-黄麻的剂量和温度。发现形成的PANI是短链聚苯胺（低聚苯胺）。对于 21.5 mmol 苯胺，黄麻纤维和链终止剂 1,4-苯二胺的最佳用量分别为 5 g 和 3.05 mmol。通过酸式铬酸根离子与质子化聚苯胺黄麻的静电吸引，在反应pH为3时观察到总铬（Cr(VI)、Cr(III)及其其他形式）的最大吸附。对于 50-500 mg/L 的初始 Cr(VI)，在 40-120 分钟内达到吸附平衡。在 pH 3 和温度 20 摄氏度下，PANI 黄麻的最大单层容量为 62.9 mg/g。总铬吸附量随着温度的升高而降低，表明铬的吸附是放热的。在解吸过程中，2 M NaOH 在 10 分钟内实现了几乎 83% 的效率。通过灼烧含铬的聚苯胺黄麻，94% 的 Cr(VI) 能够以 Cr(III) 的形式回收，同时重量减少 95%。聚苯胺黄麻可有效去除废水中的铬。 (C) 2007 Elsevier B.V. 保留所有权利。
In the present study, short chain polyaniline (PANI), a polymer was synthesized on the surface of jute fiber and was used as an adsorbent to remove hexavalent chromium (Cr(VI)). Experiments were conducted in batch mode with the variables such as amount of jute fiber on PANI, chain length of PANI, solution pH, initial concentration of Cr(VI), dose of PANI-jute and temperature. The PANI formed was found to be short chain polyaniline (oligoaniline). Optimum amount of jute fiber and chain terminating agent 1,4-phenylenediamine were observed as 5 g and 3.05 mmol, respectively, for 21.5 mmol of aniline. Maximum adsorption of total chromium (Cr(VI), Cr(Ill) and its other forms) was observed at reaction pH of 3 by electrostatic attraction of acid chromate ion with protonated PANI-jute. Adsorption equilibrium was achieved within 40-120 min for initial Cr(VI) of 50-500 mg/L. Maximum monolayer capacity of PANI-jute was observed as 62.9 mg/g at pH 3 and temperature 20 degrees C. Total chromium adsorption decreased with rise in temperature suggesting an exothermic adsorption of chromium. During desorption almost 83% efficiency was achieved within 10 min by 2 M NaOH. By ignition of chromium bounded PANI-jute, 94% Cr(VI) were able to recover as Cr(III) along with reduction in weight by 95%. PANI-jute can be used effectively to remove chromium from wastewater. (C) 2007 Elsevier B.V. All rights reserved.