Characterization of copper adsorption onto an alginate encapsulated magnetic sorbent by a combined FT-IR, XPS and mathematical modeling study
Characterization of copper adsorption onto an alginate encapsulated magnetic sorbent by a combined FT-IR, XPS and mathematical modeling study
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DOI：
10.1021/es7021889
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发表时间：
2008-04-01
影响因子：
11.4
通讯作者：
Chen, J. Paul
中科院分区：
文献类型：
--
作者：
Lim, Soh-Fong;Zheng, Yu-Ming;Chen, J. Paul
研究了海藻酸钙磁性吸附剂对铜离子的吸附性能。本研究的目的是定性和定量阐明吸附剂上的铜结合。随着初始pH从2增加到5，吸附从约0增加到几乎100%。红外光谱和X射线光电子能谱研究表明，吸附剂中的C-0分子量约为0.99mmolg ~（-1）。海藻酸钠的羧基直接连接到铜离子上，导致大部分吸附。建立了一个数学模型，该模型包括钙与铜的离子交换、官能团与铜的配位反应以及铁氧化物与铜的表面络合物的形成。该模型能够描述和预测各种关键操作参数对吸附过程的影响，如初始pH值，金属浓度和吸附剂的剂量。
Copper adsorption onto calcium alginate encapsulated magnetic sorbent is studied in this paper. The objective of this study was to qualitatively and quantitatively elucidate the copper binding onto the sorbent. The adsorption increases from around 0 to almost 100% as the initial pH is increased from 2 to 5. A maximum adsorption capacity of 0.99 mrnol g(-1) is achieved The FT-IR and XPS studies show that the C-0 in. carboxyl group of alginate directly attaches to the copper ion that leads to most of the adsorption. A mathematical model is developed, and it includes ion exchange between the calcium and the copper, coordination reaction between the functional group and the copper, as well as surface complex formation between the iron oxide and the copper. The model is capable of describing and predicting effects of various key operational parameters on the adsorption process, such as initial pH, metal concentration, and dosage of sorbent.