Characterization of adsorptive capacity and mechanisms on adsorption of copper, lead and zinc by modified orange peel

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• 作者：Ning-chuan FENG^a ; ^b ; Xue-yi GUO^a ; ^{xyguo@mail.csu.edu.cn}
• 关键词：orange peel ; chemical modification ; adsorption capacity ; adsorption mechanism
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1224-1231
• 文件大小：438 K

摘要

A novel adsorbent was prepared by modifying orange peel with sodium hydroxide and calcium chloride. The morphological and characteristics of the adsorbent were evaluated by infrared spectroscopy (IR), scanning electron microscopy (SEM) and N₂-adsorption techniques. The adsorption behavior of Cu²⁺, Pb²⁺ and Zn²⁺ on modified orange peel (SCOP) was studied by varying parameters like pH, initial concentration of metal ions. Equilibrium was well described by Langmuir equation with the maximum adsorption capacities for Cu²⁺, Pb²⁺ and Zn²⁺ of 70.73, 209.8 and 56.18 mg/g, respectively. Based on the results obtained in batch experiments, breakthrough profiles were examined using a column packed with SCOP for the separation of small concentration of Pb²⁺ from an excess of Zn²⁺ followed by elution tests. Ion exchange with Ca²⁺ neutralizing the carboxyl groups of the pectin was found to be the predominant mechanism.