吸附
黄药
聚丙烯酸
自愈水凝胶
壳聚糖
水溶液中的金属离子
水溶液
化学
化学工程
焓
吉布斯自由能
朗缪尔
无机化学
弗伦德利希方程
金属
材料科学
核化学
高分子化学
有机化学
聚合物
热力学
工程类
物理
作者
Liming Dong,Chengyang Shan,Yuan Liu,Haoyu Sun,Bing Yao,Guangbi Gong,Xiaodong Jin,Shifan Wang
标识
DOI:10.3390/ijerph191711123
摘要
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-1, 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.
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