文献类型：期刊文献

英文题名：Effect of Oxide Content of Graphene Oxide Membrane on Remarkable Adsorption for Calcium Ions

作者：Jiang, Jie[1,2];Yan, Long[1];Fang, Haiping[1,3]

机构：[1]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2021

卷号：38

期号：10

外文期刊名：CHINESE PHYSICS LETTERS

收录：;EI(收录号：20220711664673);WOS:【SCI-EXPANDED(收录号:WOS:000717789900001)】；

基金：Supported by the National Natural Science Foundation of China (Grant No. 11675246).

语种：英文

外文关键词：Silica - Molecular sieves - Reusability - Ions - Calcium - Graphene oxide - Magnetite - Membranes - Zeolites

摘要：Graphene oxide membranes (GOMs), as one of the most promising novel materials, have gained great interest in the field of adsorption. However, the oxygen content of graphene oxide is directly related to its adsorption properties, such as suspension stability, adsorption capacity, and reusability of GOMs. Here, a series of reduced GOMs with oxygen content from 28% to 12% were conveniently prepared by the thermally reduced and the corresponding interlayer spacing of these membranes changed from 8.0 angstrom to 3.7 angstrom. These prepared GOMs have remarkable Ca2+ adsorption capacity, which increases with the oxygen content or interlayer spacing of GOMs. Importantly, the max adsorption capacity of the mass ratio between adsorbed Ca2+ and pristine GOMs can reach up to 0.481 g/g, which is about one order of magnitude higher than the adsorption capacity of activated sludge, magnetic Fe3O4, functionalized silica, zeolite molecular sieve, and other reported previously. Moreover, GOMs show excellent stability and the Ca2+ can be easily desorbed by water, so that the GOMs can be reused. Our previous theoretical analysis suggests that this remarkable adsorption is attributable to the strong interactions between Ca2+ and GO sheets, including the ion-pi interactions between Ca2+ and aromatic graphitic rings as well as the electrostatic interaction between Ca2+ and oxygen-containing groups.