文献类型：期刊文献

英文题名：Molecular insights into the role of fulvic acid in cobalt sorption onto graphene oxide and reduced graphene oxide

作者：Chang, Kaikai[1];Li, Xue[2];Liao, Qing[1];Hu, Baowei[1];Hu, Jun[3,4];Sheng, Guodong[1];Linghu, Wensheng[1];Huang, Yuying[5];Asiri, Abdullah M.[6];Alamry, Khalid A.[6]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Yuanpei, Shaoxing 312000, Zhejiang, Peoples R China;[3]Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Guangdong, Peoples R China;[4]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;[5]Chinese Acad Sci, SSRF, Shanghai 201204, Peoples R China;[6]King Abdulaziz Univ, Fac Sci, Chem Dept, Jeddah 21589, Saudi Arabia

年份：2017

卷号：327

起止页码：320

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000408663800034)、、EI(收录号：20173604116484)、Scopus(收录号：2-s2.0-85028530489)、WOS

基金：Financial supports from the Natural Science Foundation of China (21577093 and 21207092), the China Postdoctoral Science Foundation Grant (2016M591140 and 2013M531536), and the Natural Science Foundation of Zhejiang Province (LY15B070001) are acknowledged. The authors thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Graphene oxide; Reduced graphene oxide; Co(II); Fulvic acid; Extended X-ray absorption fine structure

外文摘要：The role of fulvic acid (FA) in the sorption of Co(II) onto reduced graphene oxide (RGO) and graphene oxide (GO) were investigated using batch equilibrium method and extended X-ray absorption fine structure (EXAFS). The results showed that FA could be adsorbed on both RGO and GO via different interaction mechanisms, and thus exert different roles in Co(II) sorption. The sorption of FA on RGO was mainly controlled by p-p interaction, and the adsorbed FA introduced negative charges and O-bearing functional groups on RGO, facilitating Co(II) sorption due to electrostatic attraction and complexation. Meanwhile, the sorption of FA on GO was mainly governed by polar interactions, and the adsorbed FA can not only introduce new sites for enhanced Co(II) sorption, but also shield the surface of GO and occupy parts of sorption sites, which decreased Co(II) sorption. So, FA had little role in Co(II) sorption onto GO. EXAFS results suggest that O-bearing functional groups of RGO and GO were the main sorption sites for Co(II). Compared to GO, a portion of Co(II) precipitate on RGO surfaces at pH 8.78 due to fewer O-bearing functional groups. The introduction of FA provides lots of sorption sites on RGO, which makes Co(II) be adsorbed on RGO as RGO-FA-Co ternary surface complexes. The results of this work indicated that both RGO and GO exhibited great potential in pollution control applications, even in mixed organic and inorganic pollutants. (C) 2017 Elsevier B.V. All rights reserved.