Adsorption of copper (II) and lead (II) ions from aqueous solution on chitosan-coated sand
Adsorption of copper (II) and lead (II) ions from aqueous solution on chitosan-coated sand
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DOI：
10.1016/j.carbpol.2009.12.048
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发表时间：
2010-05-05
影响因子：
11.2
通讯作者：
Dalida, Maria Lourdes P.
中科院分区：
文献类型：
--
作者：
Wan, Meng-Wei;Kan, Chi-Chuan;Dalida, Maria Lourdes P.
生物可降解材料，称为壳聚糖涂层砂（CCS），用于去除水中的铜（II）和铅（II）离子。采用间歇实验考察了不同初始浓度（C-o = 100、500、1000和2000 mg/L）、溶液pH值（2、3、4、5和6）和接触时间（0.5、1、2、4、6、12和24 h）对吸附效果的影响。使用稀HCl溶液（pH 1和3）和自来水（pH 7）对吸附的金属离子进行解吸研究。静态吸附等温线和吸附常数采用Langmuir和Freundlich模型描述。在4 h接触时间下，Cu（II）和Pb（II）离子的Q（max）值分别为8.18和12.32mg/g CCS，与Langmuir模型拟合良好。动力学研究遵循准二级反应，这表明化学吸附是限速步骤。解吸过程的结果表明从CCS中回收金属离子的潜力。(C)2010爱思唯尔有限公司版权所有。
Biodegradable material, known as chitosan-coated sand (CCS), was utilized for removal of copper (II) and lead (II) ions in water. Batch experiments were conducted to investigate the adsorption effect under different initial concentration (C-o = 100, 500, 1000 and 2000 mg/L), solution pH (2, 3, 4, 5 and 6), and contact time (0.5, 1, 2, 4, 6, 12 and 24 h). Desorption studies were performed using diluted HCl solution (pH 1 and 3) and tap water (pH 7) on adsorbed metal ions. Langmuir and Freundlich adsorption models were used to describe static isotherms and constants. The data fitted well with Langmuir model at Q(max) value of 8.18 and 12.32 mg/g CCS for Cu(II) and Pb(II) ions at 4 h contact time, respectively. Kinetic studies followed the pseudo second-order reaction, which indicated that the chemical sorption is the rate-limiting step. Results of desorption process signified potential for recovering metal ions from CCS. (C) 2010 Elsevier Ltd. All rights reserved.