Preparation and High Reusability of a Novel Acid-Resistant Magnetic Weak Acid Resin for Ni2+ Removal

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• 作者：Mancheng Zhang ; Aimin Li ; Qing Zhou ; Chendong Shuang ; Yang Zhou ; Mengqiao Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 8, 2014
• 年：2014
• 卷：53
• 期：1
• 页码：340-345
• 全文大小：314K
• ISSN：1520-5045

文摘

A novel magnetic weak acid resin (MWA06) was successfully synthesized and characterized. To enhance the acid resistance and lipophilicity of the 纬-Fe₂O₃ particles, a titanate coupling agent (TCA) was employed to modify the particle surface. Afterward, the resultant resin was obtained through copolymerization and hydrolysis reactions, with a specific saturation magnetization of 10.9 emu/g and weak acid cation exchange capacity of 8.44 mmol/g. Leaching tests in acid showed that the magnetic resin was stable at pH 2. The presence of Ca²⁺ in the solution had an obviously negative impact on the adsorption of Ni²⁺, whereas Na⁺ did not influence the adsorption process. The adsorption of Ni²⁺ was pH-dependent as the uptake capacity increased from 0.06 to 2.81 mmol/g with the pH rising from 2 to 6. The desorption efficiency was nearly 100% by using 0.01 M HCl solution as desorption agent. Moreover, MWA06 could maintain high adsorption capacities for at least 10 regeneration cycles, indicative of a good reusability.