Han Shiqi, Xie Honghao, Hu Jingyi, Fan Xiangbo, Hao Chen, Wang Xiaohong
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
J Colloid Interface Sci. 2022 Dec 15;628(Pt A):878-890. doi: 10.1016/j.jcis.2022.08.002. Epub 2022 Aug 4.
The pollution of heavy metal ions and organic dyes seriously endangers human health and causes acute environmental problems. The adsorption method is extensively adopted in the treatment of water pollution which is more harmful to human health. In this work, the original reed carbon (ORC) was functionalized by polyethyleneimine (PEI). By means of radical polymerization, PEI-modified reed carbon (PRC), sodium alginate and lysine were made into carbon-composite acrylic hydrogel (SA/LS/PRC). Meanwhile, SEM, FTIR, TGA, and Zeta potential were used to characterize the adsorbent. The elimination capacity of SA/LS/PRC for Cu, Ni, and Methylene blue (MB) was researched through batch adsorption experiments. The adsorption behavior of SA/LS/PRC is more suitable for the pseudo-second-order kinetic model of chemical removal of pollutants and the Langmuir model relying on monolayer adsorption. The maximum adsorption capacities of SA/LS/PRC for Cu, Ni and MB are 1245.27, 1239.47 and 627.29 mg g, respectively, and the adsorption performance is better than those reported in most literatures. The interaction of Cu, Ni, and MB were studied via binary mixed adsorption experience. Surface complexation and electrostatic interactions are the major removal mechanisms for contaminants. The adsorption capacity of SA/LS/PRC kept above 81% after five cycles. The SA/LS/PRC green hydrogel can be effectively applied in the mixed adsorption process of heavy metal ions and the removal of dyes.
重金属离子和有机染料的污染严重危害人类健康，并引发严峻的环境问题。吸附法在处理对人类健康危害更大的水污染方面被广泛采用。在这项工作中，原始芦苇炭（ORC）通过聚乙烯亚胺（PEI）进行功能化处理。借助自由基聚合，将PEI改性芦苇炭（PRC）、海藻酸钠和赖氨酸制成碳复合丙烯酸水凝胶（SA/LS/PRC）。同时，利用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）和zeta电位对吸附剂进行表征。通过批量吸附实验研究了SA/LS/PRC对铜、镍和亚甲基蓝（MB）的去除能力。SA/LS/PRC的吸附行为更符合污染物化学去除的准二级动力学模型以及依赖单层吸附的朗缪尔模型。SA/LS/PRC对铜、镍和MB的最大吸附容量分别为1245.27、1239.47和627.29 mg/g，其吸附性能优于大多数文献报道的结果。通过二元混合吸附实验研究了铜、镍和MB之间的相互作用。表面络合和静电相互作用是去除污染物的主要机制。经过五个循环后，SA/LS/PRC的吸附容量保持在81%以上。SA/LS/PRC绿色水凝胶可有效应用于重金属离子的混合吸附过程及染料的去除。
