Hou Nan, Wang Ran, Wang Fan, Bai Jiahui, Zhou Jingxin, Zhang Lexin, Hu Jie, Liu Shufeng, Jiao Tifeng
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P. R. China.
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China.
ACS Omega. 2020 Mar 5;5(10):5470-5479. doi: 10.1021/acsomega.0c00076. eCollection 2020 Mar 17.
New self-assembled hydrogel materials of poly(vinyl alcohol)/cyclodextrin-modified poly(acrylic acid)/azobenzene-modified poly(acrylic acid) (PVA/PAA-CD/PAA-Azo) were successfully prepared via host-guest interactions and hydrogen bonds. The as-prepared hydrogel materials were characterized by various techniques, including Fourier transform infrared spectroscopy, X-ray diffraction analysis, scanning electron microscopy, ultraviolet spectroscopy, and specific surface area tests. The prepared hydrogels with different concentrations of PVA exhibited different network structures. In addition, ultraviolet (UV) light irradiation and temperature change induce a gel-sol phase transition in the hydrogel materials. The obtained hydrogel materials could be used as good adsorbents for two model organic dye molecules, which was mainly due to electrostatic interactions between methylene blue/rhodamine B (MB/RhB) and the gels in the adsorption process. In particular, the adsorption processes of the as-prepared hydrogel materials conformed to the pseudo-first-order model with a high correlation coefficient, which indicates that gel has a potential application in the field of wastewater purification.
通过主客体相互作用和氢键成功制备了新型自组装水凝胶材料聚乙烯醇/环糊精改性聚丙烯酸/偶氮苯改性聚丙烯酸（PVA/PAA-CD/PAA-Azo）。采用傅里叶变换红外光谱、X射线衍射分析、扫描电子显微镜、紫外光谱和比表面积测试等多种技术对所制备的水凝胶材料进行了表征。不同浓度聚乙烯醇制备的水凝胶呈现出不同的网络结构。此外，紫外光照射和温度变化会引起水凝胶材料发生凝胶-溶胶相转变。所制备的水凝胶材料可作为两种模型有机染料分子的优良吸附剂，这主要是由于亚甲基蓝/罗丹明B（MB/RhB）与凝胶在吸附过程中存在静电相互作用。特别是，所制备的水凝胶材料的吸附过程符合伪一级模型，相关系数较高，这表明该凝胶在废水净化领域具有潜在应用价值。
