Preparation of new chelating fiber with waste PET as adsorbent for fast removal of Cu²⁺ and Ni²⁺ from water: Kinetic and equilibrium adsorption studies

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• 作者：Jinnan Wang ; ^{wjnnju@163.com} ; Li Xu ; Cheng Cheng ; Ying Meng ; Aimin Li
• 关键词：Chelating fiber ; Adsorption ; Cu2+ ; Ni2+
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：15 June, 2012
• 卷：193-194
• 期：Complete
• 页码：31-38
• 文件大小：841 K

摘要

A new chelating fiber (WJN-1) was prepared with waste PET for fast removal of Cu²⁺ and Ni²⁺ from water. Elemental analysis, SEM, contact angle, BET surface area and ¹³CNMR were used to characterize WJN-1. The higher uptake capacity of Cu²⁺ and Ni²⁺ by WJN-1 was achieved at higher pH values, and the lower uptake capacity was observed in an acidic medium. Kinetic study indicated that the adsorption of Cu²⁺ and Ni²⁺ could be well fitted by the pseudo-second-order equation, suggesting intra-particle diffusion process as the rate-limiting step of the adsorption process. When the temperature was raised within the range of 278-308 K, the adsorption enthalpy changes of WJN-1 were about from 6.69 to 16.05 kJ mol^鈭?, and the free energy changes were about from 鈭?.03 to 鈭?.28 kJ mol^鈭?. Although the presence of Ca²⁺ in solution had negligible effect on the removal of Cu²⁺ and Ni²⁺, WJN-1 could remain over 90%of its adsorption capacity even if the Ca²⁺ concentration was up to 75 mg L^鈭?. 1 M HCl or 0.1 M EDTA could be used as effective eluant to desorb the Cu²⁺ and Ni²⁺ adsorbed by WJN-1, and the adsorption capacity of WJN-1 for two heavy metal ions could still be maintained at 93%level at the 5th cycle. Taken together, it was expected that WJN-1 could be used as a promising adsorbent for fast removal of Cu²⁺ and Ni²⁺ from water, and the present work also might provide a simple and effective method to reuse the waste PET fibers.