Liu Hongyu, Zhang Huiling, Ye Ziyan, Xiong Gaohong
College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
Int J Biol Macromol. 2025 Mar;294:139462. doi: 10.1016/j.ijbiomac.2025.139462. Epub 2025 Jan 3.
Chitosan, as a natural and environmentally friendly material, has attracted significant attention in the field of water treatment. In this study, a Chitosan/poly (dimethyl diallyl ammonium chloride-co-acrylamide) composite hydrogel (CPDA hydrogel) featuring a semi-interpenetrating network structure was synthesized via free radical copolymerization for the removal of the anionic dye Congo Red (CR) from wastewater. SEM-EDS, FTIR, XPS, TG, Zeta potential, and mercury intrusion porosimetry (MIP) were employed to analyze the physical and chemical changes in the hydrogel before and after adsorption. The results revealed that the CPDA hydrogel can selectively adsorb anionic dyes through electrostatic interactions. The study on the adsorption performance of the CPDA hydrogel demonstrated its excellent swelling capacity and stable adsorption of Congo Red over a broad pH range of 4 to 10. Subsequently, the adsorption process of Congo Red followed the Pseudo-Second-Order kinetic model and the Hill isotherm model, suggesting that Congo Red may self-assemble into ribbon-like micelles for cooperative adsorption and achieving a maximum adsorption capacity of 1803.507 mg/g. Furthermore, the CPDA hydrogel exhibited outstanding reusability over six adsorption-desorption cycles. Thus, the prepared CPDA hydrogel shows great potential as a material for the selective removal of Congo Red from mixed dye solutions.
壳聚糖作为一种天然环保材料，在水处理领域引起了广泛关注。本研究通过自由基共聚合成了一种具有半互穿网络结构的壳聚糖/聚（二甲基二烯丙基氯化铵-共-丙烯酰胺）复合水凝胶（CPDA水凝胶），用于去除废水中的阴离子染料刚果红（CR）。采用扫描电子显微镜-能谱仪（SEM-EDS）、傅里叶变换红外光谱仪（FTIR）、X射线光电子能谱仪（XPS）、热重分析仪（TG）、Zeta电位仪和压汞孔隙率仪（MIP）分析了水凝胶吸附前后的物理和化学变化。结果表明，CPDA水凝胶可通过静电相互作用选择性吸附阴离子染料。对CPDA水凝胶吸附性能的研究表明，其在4至10的宽pH范围内具有优异的溶胀能力和对刚果红的稳定吸附性能。随后，刚果红的吸附过程遵循准二级动力学模型和希尔等温线模型，表明刚果红可能自组装成带状胶束进行协同吸附，最大吸附容量达到1803.507 mg/g。此外，CPDA水凝胶在六个吸附-解吸循环中表现出出色的可重复使用性。因此，制备的CPDA水凝胶作为从混合染料溶液中选择性去除刚果红的材料具有巨大潜力。
