Ma Ying-Xia, Li Xin, Shao Wen-Jie, Kou Ya-Lan, Yang Hai-Peng, Zhang Ding-Jun
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science & Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
J Nanosci Nanotechnol. 2020 Apr 1;20(4):2205-2213. doi: 10.1166/jnn.2020.17193.
In this study, three-dimensional (3D) networked porous polyvinyl alcohol/sodium alginate/graphene oxide (PVA/SA/GO) spherical composites were fabricated by the sol-gel method and employed as adsorbents for the adsorption of methylene blue (MB) in aqueous solution. The obtained samples were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermal property analysis, and nitrogen adsorption/desorption isotherms. Moreover, the adsorption properties for MB were investigated by batch experiments. The pseudo-first-order and pseudo-second-order equations were used to fit the adsorption kinetics data, and the Langmuir and Freundlich isothermal models were used to analyze the adsorption isothermals. The results showed that the spherical composites had 3D porous structures, and GO, PVA and SA were fused and linked together by self-assembly, physical intertwining, hydrogen bonding, and Ca and boric acid crosslinking. The maximum adsorption capacity of the 3D porous PVA/SA/GO spherical composites for MB was 759.3 mg/g. The adsorption kinetics had a better agreement with the pseudo-secondorder equation than the pseudo-first-order equation, and the equilibrium data followed the Freundlich model.
在本研究中，采用溶胶-凝胶法制备了三维（3D）网络状多孔聚乙烯醇/海藻酸钠/氧化石墨烯（PVA/SA/GO）球形复合材料，并将其用作吸附剂以吸附水溶液中的亚甲基蓝（MB）。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、热性能分析和氮吸附/脱附等温线对所得样品进行了表征。此外，通过批量实验研究了对MB的吸附性能。用拟一级和拟二级方程拟合吸附动力学数据，并用朗缪尔和弗伦德利希等温模型分析吸附等温线。结果表明，球形复合材料具有3D多孔结构，GO、PVA和SA通过自组装、物理缠结、氢键以及钙和硼酸交联融合并连接在一起。3D多孔PVA/SA/GO球形复合材料对MB的最大吸附容量为759.3 mg/g。吸附动力学与拟二级方程的拟合度优于拟一级方程，平衡数据符合弗伦德利希模型。
