Romeeh Sherif A F, Younis Sherif A, Ghobashy Mohamed M, Moustafa Yasser M, Abdelaal Magdy Y, Deyab M A
Egyptian Petroleum Research Institute, Nasr City, 11727, Cairo, Egypt.
Radiation Research of Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, P.O. Box 29, Nasr City, Cairo, Egypt.
Sci Rep. 2024 Dec 16;14(1):30512. doi: 10.1038/s41598-024-82603-4.
This study aims to develop a series of cation exchange hydrogel resins via gamma irradiation technique through copolymerizing styrene sodium sulfonate with three acrylamide derivatives (designated as poly(X-co-styrene sodium sulfonate), where X refers to acrylamide (PAASS), methacrylamide (PMASS), and isopropyl acrylamide (PIASS)). The prepared hydrogel resins were characterized and tested for the adsorption removal of hard/scale metal cations (e.g., Ca, Mg, Ba, and Sr) from saline water under varying conditions. Results demonstrated that PMASS and PIASS displayed closed porous networks with a significant pH-responsive swelling behavior, increasing from 1.41 to 5.62 g/g in acidic conditions and approximately 41.49 to 45.83 g/g under neutral conditions swelling ratios, while PAASS exhibited an open porous network structure with the stable swelling ratio of around 35 g/g within mild and neutral pH ranges. All hydrogel resins also showed rapid initial adsorption of Ca > Mg > Ba > Sr, depending on ionic metal size, with adsorption equilibrium within 3-6 h. Maximum removal was achieved at neutral-basic pH when sulfonate groups were fully deprotonated with a total capacity of about ~ 147-175 mg/g overall mixed metal ions. When exposed to lower concentration solutions, about 87% of metal ions were effectively removed.
本研究旨在通过γ辐射技术，使苯乙烯磺酸钠与三种丙烯酰胺衍生物（分别为聚（X-共-苯乙烯磺酸钠），其中X指丙烯酰胺（PAASS）、甲基丙烯酰胺（PMASS）和异丙基丙烯酰胺（PIASS））共聚，从而开发出一系列阳离子交换水凝胶树脂。对制备的水凝胶树脂进行了表征，并测试了其在不同条件下从盐水中吸附去除硬垢金属阳离子（如钙、镁、钡和锶）的性能。结果表明，PMASS和PIASS呈现出封闭的多孔网络结构，具有显著的pH响应溶胀行为，在酸性条件下溶胀比从1.41增加到5.62 g/g，在中性条件下溶胀比约为41.49至45.83 g/g；而PAASS呈现出开放的多孔网络结构，在温和及中性pH范围内溶胀比稳定在35 g/g左右。所有水凝胶树脂对钙、镁、钡、锶的初始吸附都很快，这取决于离子金属的大小，吸附平衡在3至6小时内达到。当磺酸根基团完全去质子化时，在中性至碱性pH条件下实现最大去除率，对混合金属离子的总吸附容量约为147 - 175 mg/g。当暴露于较低浓度溶液时，约87%的金属离子被有效去除。
