具有可调溶胀和吸附行为的离子强度响应性两性离子共聚物水凝胶
Ionic-Strength Responsive Zwitterionic Copolymer Hydrogels with Tunable Swelling and Adsorption Behaviors.
作者信息
Xiang Tao, Lu Ting, Zhao Wei-Feng, Zhao Cheng-Sheng
机构信息
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering , Southwest Jiaotong University , Chengdu 610031 , China.
State Key Laboratory of Molecular Engineering of Polymers , Fudan University , Shanghai 200433 , China.
出版信息
Langmuir. 2019 Feb 5;35(5):1146-1155. doi: 10.1021/acs.langmuir.8b01719. Epub 2018 Aug 28.
In this work, we studied the swelling behavior and adsorption behavior of zwitterionic copolymer hydrogels, which were prepared via the free radical copolymerization of sulfobetaine methacrylate (SBMA) and other monomers including sodium p-styrenesulfonate (NaSS), acrylic acid, N-isopropylacrylamide, and 2-(dimethylamino) ethyl methacrylate. The PSBMA hydrogel showed increased swelling ratio with the increase of ionic strength at the same temperature, and the swelling process reflected endothermicity. Interestingly, the PSBMA-NaSS hydrogels collapsed when the ionic strength increased because the ions can weaken the repulsive interaction of the anionic groups of PNaSS. In addition, the PSBMA-NaSS showed high adsorption of methylene blue (760 mg/g). The zwitterionic hydrogels have potential to be used as an adsorbent in the field of wastewater treatment.
在本研究中，我们研究了两性离子共聚物水凝胶的溶胀行为和吸附行为，这些水凝胶是通过甲基丙烯酰基磺酸甜菜碱（SBMA）与其他单体（包括对苯乙烯磺酸钠（NaSS）、丙烯酸、N-异丙基丙烯酰胺和甲基丙烯酸2-(二甲氨基)乙酯）的自由基共聚制备的。在相同温度下，PSBMA水凝胶的溶胀率随离子强度的增加而增加，且溶胀过程表现为吸热。有趣的是，当离子强度增加时，PSBMA-NaSS水凝胶会塌陷，因为离子会削弱PNaSS阴离子基团的排斥相互作用。此外，PSBMA-NaSS对亚甲基蓝具有高吸附量（760 mg/g）。两性离子水凝胶有潜力用作废水处理领域的吸附剂。
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