有色金属科学与工程2023，Vol.14Issue(6)：862-870,9.DOI:10.13264/j.cnki.ysjskx.2023.06.014
赤铁矿{001}和{012}晶面对Cr(Ⅵ)吸附差异性研究
Study on the difference of Cr(Ⅵ)adsorption on{001}and{012}facets of hematite
摘要
Abstract
Hematite is the most thermally stable iron oxide,and its interaction(adsorption)with environmental pollutants has an important influence on the migration,transformation,and even environmental fate of pollutants.However,crude hematite was used to study its adsorption effect on pollutants,and the results obtained did not accurately indicate its mineral surface reactivity.In this study,hematite nanoparticles(HNPs and HNCs)with{001}and{012}facets were successfully synthesized by employing a hydrothermal method.On this basis,the kinetic and thermodynamic characteristics of Cr(Ⅵ)adsorption on different facets of hematite were investigated,and the influence of pH and ion strength on the adsorption of Cr(Ⅵ)on different facets of hematite was studied.The results showed that the adsorption processes of Cr(Ⅵ)on HNPs and HNCs were both described by the quasi-second-order kinetic model,which follows the Langmuir and Freundlich isothermal adsorption models,respectively.With the increase in temperature,the decrease in KL and KF as well as △Hɵ<0 indicated that the adsorption processes were exothermic.The adsorption amounts of HNPs and HNCs to Cr(Ⅵ)decreased with increasing solution pH.Combined the results of the ionic strength experiments with the DFT calculations,the adsorption of Cr(Ⅵ)on HNPs was mainly dominated by surface complexation,and the adsorption configuration was monodentate mononuclear,while the adsorption of Cr(Ⅵ)on HNCs was mainly dominated by surface complexation and electrostatic adsorption,and the adsorption configuration was bidentate binuclear.The above results can be expected to provide a reference for the application of hematite in environmental governance.关键词
赤铁矿/不同晶面/Cr(Ⅵ)/吸附构型Key words
hematite/different crystal planes/Cr(Ⅵ)/adsorption configuration分类
矿业与冶金引用本文复制引用
廖荣,罗才贵,高琦,钟丽娴,罗仙平..赤铁矿{001}和{012}晶面对Cr(Ⅵ)吸附差异性研究[J].有色金属科学与工程,2023,14(6):862-870,9.基金项目
国家自然科学基金资助项目(41902038) （41902038）
江西理工大学钨资源高效开发及应用教育部工程研究中心开放课题资助项目(W-2021YB002) （W-2021YB002）
中国博士后科学基金面上资助项目(2018M6432) （2018M6432）
江西省研究生创新专项资金资助项目(YC2021-S550) （YC2021-S550）
