聚偏氟乙烯
膜
吸附
化学工程
材料科学
解吸
氧化物
朗缪尔吸附模型
嫁接
石墨烯
纳米复合材料
高分子化学
化学
复合材料
聚合物
有机化学
工程类
冶金
生物化学
作者
Yuexin Guo,Zhiqian Jia,Shuhuan Wang,Yabin Su,Hongkun Ma,Liguang Wang,Wei Meng
标识
DOI:10.1016/j.jhazmat.2019.05.044
摘要
UV photo-preactivation/thermally-induced grafting was employed for grafting 4-vinylpyridine (4-VP) on polyvinylidene fluoride (PVDF), and graphene oxide (GO) was modified with 4'-carboxy-2,2':6',2"-terpyridine (CTPy). Then sandwich PVDF-g-4VP/GO-CTPy/polytetrafluoroethylene (PTFE) membrane was fabricated for adsorption of Cu (II) as a model. The membrane formation, static adsorption thermodynamics, kinetics and dynamic adsorption/desorption were studied. The results showed that, the addition of polyethylene glycol (PEG 4000) as porogen can significantly increase the porosity and adsorption capacity of the membranes. The adsorption could be well described by the Langmuir model and pseudo-second-order kinetic model. The breakthrough volume and saturated volume increased with rising GO-CTPy contents. The adsorption capacity of sandwich membranes was much higher than that of mixed matrix membranes. The sandwich membrane also exhibited excellent reusability in dynamic adsorption/desorption cycles, demonstrating great potential in adsorption of trace Cu (II).
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