文献类型：期刊文献

英文题名：Macroscopic and molecular study of the sorption and co-sorption of graphene oxide and Eu(III) onto layered double hydroxides

作者：Chang, Kaikai[1];Sun, Yanxia[1];Ye, Feng[1];Li, Xue[4];Sheng, Guodong[1];Zhao, Donglin[3,5];Linghu, Wensheng[1];Li, Hui[1];Liu, Juan[2]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Guangzhou Univ, Coll Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China;[3]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China;[4]Shaoxing Univ, Coll Yuanpei, Shaoxing 312000, Peoples R China;[5]Anhui Univ Architecture, Sch Mat & Chem Engn, Hefei 230601, Peoples R China

年份：2017

卷号：325

起止页码：665

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000403733800067)、、EI(收录号：20172103695544)、Scopus(收录号：2-s2.0-85019573713)、WOS

基金：Financial supports from the Natural Science Foundation of Zhejiang Province (LY15B070001), Natural Science Foundation of China (21577093, 21207092, and 41303007), the Guangdong Provincial Natural Science Foundation (2015A030313512) are greatly 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; Eu(III); Layered double hydroxides; Sorption and co-sorption

外文摘要：In recent years, the fate and transport of graphene oxide (GO) has received considerable attention owing to its inevitable release into the natural ecosystem during production and applications, wherein mineral particles and radionuclides are generally co-presented. This paper aimed to clarify the sorption and co-sorption of Eu(III) and GO onto Mg/Al layered double hydroxides (LDH) using batch and extended Xray absorption fine structure (EXAFS) studies. The results showed that Eu(III) and GO displayed interactively enhancement roles in their co-sorption on LDH. Eu(III) enhanced GO co-sorption on LDH which was mainly due to the formation of "LDH-Eu(III)-GO" ternary surface complexes (i.e., Eu(III)-bridging). While, GO increased Eu(III) co-sorption on LDH which was primarily due to the formation of "LDH-GO-Eu(III)" ternary surface complexes (i.e., GO-bridging). EXAFS fitting results. exhibited that the presence of GO could suppress the formation of outer-sphere complexes of Eu(III) on LDH at low pH values, while inhibit the formation of surface precipitates of Eu(III) on LDH at high pH values. The enhanced co-sorption of Eu (III) and GO on LDH as they co-presented might decrease their mobility in the natural environment. These new findings are important to understand the environmental behavior and impact of GO in real ecosystem, and the natural purification of radionuclides in ecological environments. (C) 2017 Elsevier B.V. All rights reserved.