Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
J Environ Manage. 2011 Jul;92(7):1690-5. doi: 10.1016/j.jenvman.2011.01.028. Epub 2011 Mar 4.
Magnetic cationic hydrogel (MCH) was synthesized, and its removal efficiency and mechanisms in regard to natural organic matter (NOM, represented by humic acid and fulvic acid) from the aqueous environment were studied. The effects of time, adsorbent dosage, initial pH, ionic strength, background ions, and NOM types were also investigated. MCH was characterized and found to have a strong magnetic character, yielding an extra advantage for recycling and reuse. Batch studies showed that the removal of Aldrich humic acid (AHA) by MCH was effective. The main mechanism for the removal of NOM is believed to be due to electrostatic interaction. NOM with larger molecular weight tended to be preferentially removed. Solutions with low pH, high ionic strength, and background electrolytes containing calcium, sulfate and bicarbonate were unfavorable for AHA removal. The adsorption-desorption of MCH was evaluated in three cycles, and demonstrated high regeneration rates.
磁性阳离子水凝胶（MCH）被合成，并研究了其从水相环境中去除天然有机物（NOM，以腐殖酸和富里酸表示）的去除效率和机制。还考察了时间、吸附剂用量、初始 pH 值、离子强度、背景离子和 NOM 类型的影响。对 MCH 进行了表征，发现其具有很强的磁性，这为回收和再利用提供了额外的优势。批量研究表明，MCH 对阿尔德里奇腐殖酸（AHA）的去除是有效的。去除 NOM 的主要机制据信是由于静电相互作用。分子量较大的 NOM 往往优先被去除。低 pH 值、高离子强度以及含有钙、硫酸盐和碳酸氢盐的背景电解质的溶液不利于 AHA 的去除。在三个循环中评估了 MCH 的吸附-解吸，表现出高的再生率。
