聚乙烯醇
吸附
化学工程
纳米复合材料
材料科学
复合数
自愈水凝胶
氧化物
石墨烯
朗缪尔吸附模型
乙烯醇
复合材料
高分子化学
化学
聚合物
纳米技术
有机化学
冶金
工程类
作者
Yaru Yu,Ge Zhang,Lin Ye
摘要
ABSTRACT A series of polyvinyl alcohol (PVA)/graphene oxide (GO)‐sodium alginate (SA) nanocomposite hydrogel beads were prepared through in situ crosslinking for Pb 2+ removal. It was found that PVA and SA molecules were intercalated into GO layers through hydrogen bonding interactions, leading to the destruction of orderly structure of GO, while GO uniformly distributed in PVA matrix. With increasing PVA solution concentration, the hydrogel beads became more regular, a large number of polygonal pores with thin walls and open pores formed, the average pore size decreased, and the dense network structure formed. Meanwhile, the permeability of the composite hydrogel decreased, leading to the decline of Pb 2+ adsorption capacity of the composite hydrogel. With increasing GO content, the ballability of the hydrogel beads was weakened, the pore size increased, and relatively loose network structure formed, resulting in an increase in permeability and Pb 2+ adsorption capacity of the hydrogel, reaching up to 279.43 mg g −1 . Moreover, the composite hydrogel presented relatively good reusability for Pb 2+ removal. The adsorption mechanism was explored and showed that the adsorption system of the composite hydrogel belonged to the second‐order kinetic model and fitted Langmuir adsorption isotherm model for Pb 2+ removal, which might be mono‐layer chemical adsorption. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47318.
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