School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
Department of Forensic Science and Technology, Jiangsu Police Institute, Nanjing 210031, China.
Int J Environ Res Public Health. 2022 Sep 5;19(17):11123. doi: 10.3390/ijerph191711123.
A simple method was used to synthesize magnetic xanthate-modified chitosan/polyacrylic acid hydrogels that were used to remove heavy metal ions from an aqueous solution. Xanthate modification of chitosan significantly improved adsorption performance: individual adsorption capacities of the hydrogel for Cu(II), Cd(II), Pb(II), and Co(II) ions were 206, 178, 168, and 140 mg g, respectively. The magnetic hydrogels had good regeneration ability and were effectively separated from the solution by use of a magnet. Adsorption kinetic data showed that the removal mechanism of heavy metal ions from the solution by magnetic hydrogels occurs mainly by chemical adsorption. The equilibrium adsorption isotherms were well-described by the Freundlich and Langmuir equations. Positive values were found for the Gibbs standard free energy and enthalpy, indicating an increase in the disorder at the solid-liquid interface during adsorption. Magnetic xanthate-modified chitosan-based hydrogels that exhibit high adsorption efficiency, regeneration, and easy separation from a solution have broad development prospects in various industrial sewage and wastewater treatment fields.
一种简单的方法被用来合成磁性黄原酸酯改性壳聚糖/聚丙烯酸水凝胶，用于从水溶液中去除重金属离子。壳聚糖的黄原酸酯改性显著提高了吸附性能：水凝胶对 Cu(II)、Cd(II)、Pb(II) 和 Co(II)离子的单个吸附容量分别为 206、178、168 和 140 mg g-1。磁性水凝胶具有良好的再生能力，并可通过磁铁有效地从溶液中分离出来。吸附动力学数据表明，磁性水凝胶从溶液中去除重金属离子的去除机制主要通过化学吸附发生。平衡吸附等温线很好地由 Freundlich 和 Langmuir 方程描述。吉布斯标准自由能和焓的正值表明吸附过程中固-液界面的无序度增加。具有高吸附效率、再生能力和易于从溶液中分离的磁性黄原酸酯改性壳聚糖基水凝胶在各种工业污水和废水处理领域具有广阔的发展前景。
