Characterization of Some Hydrogels Used in Water Purification: Correlation of Swelling and Free-Volume Properties
Characterization of Some Hydrogels Used in Water Purification: Correlation of Swelling and Free-Volume Properties作者机构：Physics Department Faculty of Science Ain Shams University Abbassia Cairo Egypt Polymer Chemistry Department—National Center for Radiation Research and Technology Atomic Energy Authority Naser City Egypt
出 版 物：《Open Journal of Organic Polymer Materials》 (有机高分子材料期刊（英文）)
年 卷 期：2015年第5卷第3期
页 面：79-88页
主 题：Hydrogels Irradiation Copolymerization FTIR PAL Water Decontamination
摘 要：In this study, the main objective is to develop a good chelation and ion exchange hydrogel. This hydrogel is obtained by polymerization of dimethyl amino ethyl methacrylate (DMAEMA) and acrylic acid (AAc) by gamma irradiation, for the purpose of separation of some heavy and toxic metals from water. UV spectroscopy is applied to determine the metal ion concentration before and after treatment. The FTIR spectral analysis has identified the bond structure of PAAc, DMAEMA and P (DMAEMA/AAc) hydrogels. Microstructure and nanostructure are investigated by means of SEM and positron annihilation lifetime spectroscopy (PALS) respectively. A maximum swelling percent is found for 80/20 DMAEMA/AAc at free-volume hole size and fraction of 97?3 and 3.4% respectively. The P (DMAEMA/AAc) and PAAc hydrogels have been applied for Cu+2, Co+2 and Ni+2 removals from aqueous solutions, and the factors affecting the adsorption capacity are determined. The adsorption capacity of P (DMAEMA/AAc) is found to be higher than the corresponding ones PAAc. Its experimental results showed that, the maximum adsorption of P (DMAEMA/AAc) after 24 h occurs at pH 7 with concentration of 250 ppm for Ni+2 ions and at pH 5 with concentration of 40 ppm for Cu+2 and Co+2 ions. The adsorption affinity of P (DMAEMA/AAc) hydrogel at different treatment contact times is in the following order Ni Cu Co. However, the order becomes Co Ni Cu by the variation of the pH of the metal ion solution;the variation of its concentration leads to a different order of Cu Co Ni.
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