文献类型：期刊文献

英文题名：Electrostatic Self-Assembly of Nanoscale Fes Onto Mxenes with Enhanced Reductive Immobilization Capability for U(Vi) and Cr(Vi)

作者：Liu, Fenglei[1,2]; Wang, Shanshan[1]; Hu, Baowei[1]

机构：[1] School of Life Science, Shaoxing University, Huancheng West Road 508, Shaoxing, 312000, China; [2] Key Laboratory of Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220433165)

语种：英文

外文关键词：Electrostatics - Heavy metals - Iron compounds - Isotherms - Nanoparticles - Pollution - Self assembly - Spectroscopic analysis - Uranium compounds

外文摘要：Herein, a MXenes decorated nanoscale FeS composites were developed via electrostatic self-assembly strategy to achieve efficient U(VI)/Cr(VI) adsorption-reduction. Different analytical techniques were applied to adequately characterize all as-prepared materials to determine the formation of species with the desired morphology and properties. Results revealed that the special chemical structure of MXenes could improve the dispersion of FeS nano-particles and suppress its aggregation. Meanwhile, the adsorption data closely well tailored with the Langmuir isotherm and Pseudo-second-order equation, and the maximum removal efficiencies were 88.5 and 107.2 mg/g for uranium(VI) and chromium(VI). It was also found that the presence of other cations and anions had no obvious influence on removal of U(VI)/Cr(VI), whereas the elimination process was a spontaneous endothermic reaction. More importantly, according to the spectroscopic analysis and DFT calculation, both FeS and surface functional groups on Ti3C2@FeS-PDA/PEI exhibited strong chemical affinities to the targeted pollutants, while FeS could effectively reduce Uranium(VI) to Uranium(IV) and Chromium(VI) to Chromium(III). This work facilitated the omnidirectional improvement of FeS-based materials for the de-pollution of practical radionuclide or heavy metals wastewater. ? 2022, The Authors. All rights reserved.