文献类型：期刊文献

英文题名：Graphene oxide-mediated the reduction of U(VI), Re(VII), Se(VI) and Se(IV) by Fe(II) in aqueous solutions investigated via combined batch, DFT calculation and spectroscopic approaches

作者：Chen, Junjie[1];Wu, Hui[1];Sheng, Guodong[1];Li, Hui[1];Li, Manli[2];Guo, Xiaojie[3];Dong, Hongliang[4,5]

机构：[1]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Key Lab Clean Dyeing & Finishing Technol Zhejiang, Shaoxing 312000, Zhejiang, Peoples R China;[3]Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Zhejiang, Peoples R China;[4]Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China;[5]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 201899, Peoples R China

年份：2022

卷号：433

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000779141700001)、、EI(收录号：20215111332295)、Scopus(收录号：2-s2.0-85121121932)、WOS

基金：The work was supported by the National Natural Science Foundation of China (21777102) , and the Natural ScienceNatural Science Founda-tion of Zhejiang Province of Zhejiang Province (LQ19E030017) . We also sincerely thank the young and middle-aged academic cadres from Shaoxing University. Prof. S. Zhou from Zhejiang university was great appreciated for the DFT calculations.

语种：英文

外文关键词：Graphene oxide; Radionuclides; Fe(II); Mediation efficiency

外文摘要：Although thermodynamically feasible, reduction of U(VI), Re(VII), Se(VI) and Se(IV) in homogeneous Fe(II) solution could be hardly observed. Whereas, surface-mediated reduction by Fe(II) has been generally regarded as a major pathway for the immobilization of these radionuclides. In this paper, graphene oxide (GO) was firstly revealed to mediate the reduction of U(VI), Re(VII), Se(VI) and Se(IV) by aqueous Fe(II) via a combined batch, DFT calculation and spectroscopic investigation. The kinetics for all adsorption systems could be fitted by the pseudo-second-order model, which was indicative of a chemical interaction. The isotherms for all reaction systems could be described by the Freundlich model better than that by the Langmuir model. Spectroscopic studies indicated that the enhancement effects of GO were attributable to the facilitated electron transfer by the graphitic surfaces and particularly to the decreased Fe(III)-Fe(II) redox potential by surface adsorption of Fe(II) with O-bearing functional groups on GO. Additionally, the presence of coexisting dissolved fulvic acid (FA) could significantly promoted GO-mediated reduction, by enhancing the electron shuttle ability of GO. Therefore, owning to the combined strong mediation efficiency and excellent adsorption affinity, GO exhibited an important role in mediating the reductive immobilization of radionuclides in a wide range of redox-stratified environments.