Zhang Hong, Yang Xiaodong, Zhang Xin, Liu Wenbin, Fan Meiqing, Wang Lei
Jilin Provincial Key Laboratory of Straw-Based Functional Materials, Institute for Interdisciplinary Biomass Functional Materials Studies, Jilin Engineering Normal University, Changchun 130052, China.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150009, China.
Molecules. 2024 Nov 16;29(22):5414. doi: 10.3390/molecules29225414.
Heavy metal ions in industrial wastewater pose significant environmental and ecological threats. In this work, a hydrogel featuring a double network structure was synthesized via radical polymerization and cross-linking of β-cyclodextrin (CD) and carboxymethylcellulose (CMC) with acrylic acid (AA). The hydrogel's functional groups and microstructure were characterized using Fourier transform infrared spectroscopy (FTIR-ATR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Mechanical properties were evaluated through rheological and compression tests. The study examined the impact of initial metal ion concentration, adsorbent-ion contact time, and solution pH on adsorption capacity. The maximum adsorption capacities of the functionalized CD/CMC-PAA-MBA hydrogel for Cu, Pb, and Cd ions were 158.12, 393.56, and 290.12 mg/g, respectively. Notably, the hydrogel exhibited the highest selectivity for Pb in mixed solutions. The adsorption kinetics of the metal ions were modeled using the pseudo-second-order rate equation and the Langmuir adsorption isotherm.
工业废水中的重金属离子对环境和生态构成重大威胁。在本研究中，通过β-环糊精（CD）、羧甲基纤维素（CMC）与丙烯酸（AA）的自由基聚合和交联反应，合成了一种具有双网络结构的水凝胶。采用傅里叶变换红外光谱（FTIR-ATR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和热重分析（TGA）对水凝胶的官能团和微观结构进行了表征。通过流变学和压缩试验评估了其力学性能。该研究考察了初始金属离子浓度、吸附剂-离子接触时间和溶液pH值对吸附容量的影响。功能化的CD/CMC-PAA-MBA水凝胶对铜、铅和镉离子的最大吸附容量分别为158.12、393.56和290.12 mg/g。值得注意的是，该水凝胶在混合溶液中对铅表现出最高的选择性。采用伪二级速率方程和朗缪尔吸附等温线对金属离子的吸附动力学进行了建模。
