吸附
苯乙烯
膜
水溶液
朗缪尔吸附模型
铷
化学工程
化学
静电纺丝
高分子化学
有机化学
共聚物
钾
工程类
聚合物
生物化学
作者
Qiang Shi,Haiyan Zhang,Jixuan Jiao,Xiufang Sun,Jiankui Sun,Yuantao Xie,Lihua Liu,HuanHuan Chen,Yi Shen,Guixiang Hou,Yuexin Guo,Zhiguo Zhang
标识
DOI:10.1016/j.seppur.2023.123334
摘要
Highly selective and efficient rubidium ion (Rb+) capture from high salinity aqueous solutions has always been an extremely challenging task. Herein, a novel Rb+ selective adsorption nanofiber membranes are fabricated via electrospun by using a linear polymer poly(styrene-co-4-hydroxylstyrene) (P(S-co-VPh)) containing phenolic hydroxyl groups, which hydrolyzed from the copolymer of styrene (St) and 4-acetoxystyrene (AS). GPC, 1H NMR and FTIR, results showing that the polymer chain structures can be effectively regulated via changing the monomers ratio. After electrospinning, the morphologies and specific surface areas of as-prepared membranes are evaluated by FESEM and BET. The adsorption experiment results show that Rb+ adsorption capacity gradually increase with phenolic hydroxyl group density of the membrane surfaces. The adsorption process agrees with the Langmuir model, and the maximum adsorption capacity (qm) is up to 53.15 mg/g, and the adsorption kinetics obeys preferentially the pseudo-second-order kinetics. Intraparticle diffusion model shows that the adsorption is a multi-step limiting process and breakthrough curve is best fitted by the Yan model. Surprising, over 80% of the maximum adsorption capacity can be achieved within 15 min, and adsorption equilibrium is reached within 1.0 h. Furthermore, the excellent selectivity coefficient K of Rb+/Mn+ in high salinity binary mixtures are 580.2, 426.4, 258.1 and 128.3 for Na+ (9.6 g/L), Mg2+ (1.28 g/L), Ca2+ (0.4 g/L), K+ (0.5 g/L) used as the interfering ions, respectively. Moreover, the recovery rate remains exceeding 85% after five adsorption–desorption cycles, indicating that nanofiber membranes prepared by P(S-co-VPh) have significant application potential for rubidium separation and purification in the future.
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