Gao Yagui, Guo Rong, Feng Yao, Zhang Lexin, Wang Cuiru, Song Jingwen, Jiao Tifeng, Zhou Jingxin, Peng Qiuming
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China.
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P. R. China.
ACS Omega. 2018 Sep 24;3(9):11663-11672. doi: 10.1021/acsomega.8b01810. eCollection 2018 Sep 30.
The excellent physical and chemical properties of cyclodextrin polymer (poly-CD)/azobenzene-modified polyacrylic acid (PAA-Azo) binary composite hydrogels have been designed and prepared. The prepared hydrogels were subjected to a variety of characterizations, including scanning electron microscopy, ultraviolet spectroscopy, circular dichroism spectroscopy, infrared spectroscopy, rheological properties, and specific surface area tests. It was found that the obtained hydrogels have the cross-linked three-dimensional porous network nanostructures, and the formed composite poly-CD/PAA-Azo hydrogel can basically be shear thinned and have good recovery performance. A process of gel-sol transition can occur when the gel has a stimulatory response under UV light irradiation. In addition, such excellent properties of hydrogels exhibit different mechanisms in the adsorption of organic molecules that are harmful to the environment, such as bisphenol A (BPA) and methylene blue (MB). The polymeric hydrogel serves as novel adsorbent agents to adsorb BPA via host-guest interaction and anchor MB via electrostatic interaction and hydrogen bonding.
已设计并制备了环糊精聚合物（聚环糊精）/偶氮苯改性聚丙烯酸（PAA - Azo）二元复合水凝胶优异的物理和化学性质。对制备的水凝胶进行了多种表征，包括扫描电子显微镜、紫外光谱、圆二色光谱、红外光谱、流变性质和比表面积测试。结果发现，所得到的水凝胶具有交联的三维多孔网络纳米结构，并且形成的复合聚环糊精/PAA - Azo水凝胶基本可发生剪切变稀并具有良好的恢复性能。当凝胶在紫外光照射下具有刺激响应时，会发生凝胶 - 溶胶转变过程。此外，水凝胶的这种优异性质在对环境有害的有机分子如双酚A（BPA）和亚甲基蓝（MB）的吸附中表现出不同的机制。聚合物水凝胶作为新型吸附剂，通过主客体相互作用吸附BPA，并通过静电相互作用和氢键固定MB。
