静电纺丝
聚乙烯醇
吸附
材料科学
纳米纤维
化学工程
膜
朗缪尔吸附模型
弗伦德利希方程
石墨烯
戊二醛
中空纤维膜
氧化物
复合数
纤维
高分子化学
复合材料
聚合物
化学
有机化学
纳米技术
生物化学
工程类
冶金
作者
Yi Zheng,Huihuang Ma,Jie Wang,Chuan Fan
摘要
Abstract In this paper, a graphene‐oxide/carboxymethyl‐chitosan/polyvinyl‐alcohol (GO/CMC/PVA) composite nanofiber membrane was prepared by electrospinning and cross‐linking with glutaraldehyde (GA) to improve the water resistance. The composite nanofiber membrane can be used in the field of heavy metal adsorption. The membrane was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction. The effects of GO concentration, adsorption time, and initial concentration of heavy‐metal ion (Ni 2+ , Cu 2+ , Ag + , and Pb 2+ ) solution on the adsorption performance of the fiber membranes were investigated. The results showed that the addition of GO can reduce the diameter of nanofibers. GO, CMC, and PVA exhibited good compatibility, and the intermolecular hydrogen bonding improved. The addition of GO also improved the crystalline properties of the composite fiber membrane. In the optimal cross‐linking condition, GA was saturated by steam cross‐linking for 6 h. The introduction of GO improved the adsorption capacity of the membrane for heavy metals in water. The utmost adsorption capacities for Ni 2+ , Cu 2+ , Ag + , and Pb 2+ were 262.1, 237.9, 319.3, and 413.6 mg/g when using the cross‐linked composite fiber membranes, respectively. The results of adsorption kinetics and thermodynamics showed that the adsorption process accorded with the pseudo‐second‐order kinetic model and Langmuir–Freundlich isotherm model.
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