粘土基超强吸水复合材料的合成及其吸附性能。
Synthesis of clay-based superabsorbent composite and its sorption capability.
机构信息
Department of Chemistry, Faculty of Arts and Sciences, Dicle University, 21280 Diyarbakir, Turkey.
出版信息
J Hazard Mater. 2009 Nov 15;171(1-3):717-23. doi: 10.1016/j.jhazmat.2009.06.067. Epub 2009 Jun 21.
A novel superabsorbent composite was synthesized by copolymerization reaction of partially neutralized acrylic acid (AA) on bentonite micropowder using N,N'-methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator in aqueous solution. The superabsorbent composite (SAC) was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The water retention test of SAC was also performed. The water absorbency of SAC synthesized was found to be 352 and 110 g H(2)Og(-1) in distilled water and 0.2% NaCl, respectively. Sorption capacity of SAC was investigated for heavy metal ions (HMI) using Langmuir and Freundlich model of adsorption. The maximum adsorption capacity (Q(m)) of HMI onto the bentonite-based SAC from their solution was 1666.67, 270.27, 416.67 and 222.22 mg g(-1) for Pb(II), Ni(II), Cd(II) and Cu(II), respectively. All results suggested that SAC offers excellent potential for HMI removal from contaminated water.
一种新型的高吸水性复合材料是通过部分中和的丙烯酸（AA）在膨润土微粉上的共聚反应合成的，使用 N，N'-亚甲基双丙烯酰胺作为交联剂和过硫酸铵作为引发剂在水溶液中。高吸水性复合材料（SAC）的特征在于傅里叶变换红外光谱（FTIR）、热重分析（TGA）和扫描电子显微镜（SEM）。还进行了 SAC 的保水试验。发现所合成的 SAC 在蒸馏水中的吸水率为 352 和 110 g H(2)Og(-1)，在 0.2%NaCl 中的吸水率分别为 352 和 110 g H(2)Og(-1)。使用 Langmuir 和 Freundlich 吸附模型研究了 SAC 对重金属离子（HMI）的吸附容量。从溶液中，膨润土基 SAC 对 HMI 的最大吸附容量（Q(m)）分别为 1666.67、270.27、416.67 和 222.22 mg g(-1)，用于 Pb(II)、Ni(II)、Cd(II)和 Cu(II)。所有结果表明，SAC 为去除受污染水中的 HMI 提供了极好的潜力。
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