文献类型：期刊文献

英文题名：Decontamination performance of magnetic graphene oxide towards nickel ions and its underlying mechanism investigation by XAFS

作者：Jin, Chengan[1];Feng, Gaofeng[1];Linghu, Wensheng[1];Zhang, Lianyang[1];Shen, Runpu[1];Hu, Jun[2];Huang, Yuying[3];Zhu, Yuling[1];Asiri, Abdullah M.[4];Marwani, Hadi M.[4];Wu, Xilin[5];Sheng, Jiang[6]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Guangdong, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China;[4]King Abdulaziz Univ, Fac Sci, Chem Dept, Jeddah 21589, Saudi Arabia;[5]Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Peoples R China;[6]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

年份：2018

卷号：258

起止页码：48

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000431932700007)、、EI(收录号：20181004856795)、Scopus(收录号：2-s2.0-85042721912)、WOS

基金：Financial supports from the National Natural Science Foundation of China (21676166, 21302130), the Research Project of Shaoxing University (2017LG1001) is greatly acknowledged.

语种：英文

外文关键词：Magnetic graphene oxide; Nickel ions; Decontamination performance; X-ray absorption fine structure (XAFS) analysis

外文摘要：In this paper, the decontamination performance and its underlying mechanism of magnetic graphene oxide (MGO) towards nickel (Ni(II)) ions were studied by batch technique and X-ray absorption fine structure (XAFS) analysis. The conditions that affect Ni(II) uptake, such as reaction time, pH, ionic strength, coexisting ions, humic/fulvic acid (HA/FA) and temperature were investigated by control variable method. The adsorption kinetics indicated that Ni(II) uptake on MGO was corresponded with pseudo-second-order rate equation, and it can reach equilibrium after similar to 4.0 h. The pH had ken speckle effect on Ni(II) uptake, while the ionic strength and coexisting ions had scant impact on Ni(II) uptake. The presence of HA/FA has a positive impact on Ni(II) uptake at pH < 7.0, while has a negative impact on Ni(II) uptake at pH > 7.0. The uptake of Ni(II) can be better described by Langmuir model than Freundlich model. The thermodynamic analysis suggests that Ni(II) uptake was an endothermic and spontaneous behavior. XAFS analysis indicate that Ni(II) was captured on the binding sites of MGO, and some Ni(II) can bind on the surfaces of the iron oxides coated on GO to form strong inner-sphere complexes with good thermodynamic stability. Results of this study indicate that MGO is a significant material for treatment of Ni(II)-bearing effluents and may also be an effective adsorbent for removing other metal ions from wastewater. (C) 2018 Elsevier B.V. All rights reserved.