Hydrophobic-force-driven adsorption of bisphenol A from aqueous solution by polyethylene glycol diacrylate hydrogel microsphere
Hydrophobic-force-driven adsorption of bisphenol A from aqueous solution by polyethylene glycol diacrylate hydrogel microsphere
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DOI：
10.1007/s11356-019-05557-5
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发表时间：
2019-08-01
影响因子：
5.8
通讯作者：
Piao, Mingyue
中科院分区：
文献类型：
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作者：
Du, Hongxue;Shi, Shuyun;Piao, Mingyue
采用紫外辅助反相乳液聚合法合成了聚乙二醇二丙烯酸酯（PEGDA）水凝胶微球。光学显微镜和透射电子显微镜证实其为球形和中空结构，而X射线衍射图证实其为非晶态，结晶度有限。FTIR检测到了大量的羟基等含氧官能团。该水凝胶在水中的溶胀度为0.19 ~ 0.77g/g，在盐溶液中溶胀度降低。考察了PEGDA与聚乙二醇甲基丙烯酸酯（PEGMA）的组成、双酚A（BPA）初始浓度、pH值和操作温度等操作参数对吸附效果的影响。所得水凝胶，特别是对于PDM 2（PEGDA和PEGMA之间的比率为2），能够有效地富集水中的BPA。吸附容量在pH值低于8.0时基本稳定，超过8.0时吸附容量下降。热力学参数反映了BPA在水凝胶上的吸附是自发的（Δ G（0））
Polyethylene glycol diacrylate (PEGDA) hydrogel microsphere was synthesized by UV-assisted reverse emulsion polymerization as an efficient adsorbent for water purification. Optical microscopy and TEM proved its spherical and hollow structure, while XRD pattern proved that it was amorphous with limited crystallinity. Abundant oxygen-containing functional groups such as hydroxyl were detected by FTIR. The hydrogels exhibited low swelling capacities ranging from 0.19 to 0.77g/g in water and would decrease in salty solutions. The effects of operation parameters on the bisphenol A (BPA) adsorption were studied, including the polymer composition between PEGDA and polyethylene glycol methacrylate (PEGMA), initial concentration of BPA, pH, and operation temperature. The resulting hydrogel, especially for PDM2 (the ratio between PEGDA and PEGMA is 2), was able to effectively enrich BPA in water. The adsorption capacity was nearly stable below pH8.0 and decreased when beyond 8.0. Thermodynamic parameters reflected that BPA adsorbed by hydrogel was a spontaneous (Delta G(0)