聚电解质
吸附
自愈水凝胶
化学
朗缪尔吸附模型
刚果红
亚甲蓝
动力学
化学工程
核化学
色谱法
高分子化学
聚合物
肿胀 的
半乳甘露聚糖
有机化学
多糖
催化作用
工程类
物理
光催化
量子力学
作者
Pengfei Li,Ting Wang,Jing He,Jianxin Jiang,Fuhou Lei
标识
DOI:10.1016/j.carbpol.2021.118009
摘要
Three novel polyelectrolyte galactomannan hydrogels (PGHs) were fabricated by chemically crosslinking quaternary ammonium galactomannan (QAG) and carboxymethyl galactomannan (CMG), and employed for the removal of Congo Red (CR) and Methylene Blue (MB). Physicochemical characterization revealed that the PGHs are chemically and physically crosslinked. The PGHs are pH- and ion-sensitive, and their physical crosslinking can be destroyed by artificial urine; water swelling capacity (100.6–321.9 g/g dry gel) and artificial urine swelling capacity (35.9–80.5 g/g dry gel). The adsorption of CR and MB was studied and found to be pH-dependent and selective. The maximum adsorption capacities of CR and MB on the QAG and CMG gels are 1441 and 94.52 mg/g, respectively, and their adsorption kinetics and isotherm behavior obey the pseudo-second-order kinetics model and Langmuir isotherm model, respectively. The adsorption mechanism is dominated by electrostatic interactions and hydrogen bonding. Further, the PGHs have excellent salt resistance and are reusable.
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