Sorption of uranyl ions on TiO_2:Effects of pH,contact time,ionic strength,temperature and HA

查看全文 作　　者：Jingjing [1,2]Wang;Bihong [2]He;Xiaoyan [1,2]Wei;Ping [2]Li;Jianjun [2]Liang;Shirong [3]Qiang;Qiaohui [2]Fan;Wangsuo [1]Wu

机构地区：[1]Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University;[2]Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics,Chinese Academy of Sciences;[3]Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Physiology, School of Basic Medical Sciences,Lanzhou University

出　　处：《Journal of Environmental Sciences》索引2019年第31卷第1期,共9页

基　　金：supported by the Natural National Science Foundation of China (Nos.21601169,41573128,21601179 and 21647009);the Natural National Science Foundation of Gansu Province (No.17JR5RA309);the Key Laboratory Project of Gansu Province (No.1309RTSA041);CAS 'Light of West China' Program;the '100-Talent' Program from the Chinese Academy of Sciences in Lanzhou Center for Oil and Gas Resources,Institute of Geology and Geophysics,CAS 摘　　要：Sorption of U(VI) onto TiO_2 as functions of pH, ionic strength, contact time, soil humic acid(SHA), solid-to-liquid ratio and temperature was studied under ambient conditions using batch and spectroscopic approaches. The sorption of U(VI) on TiO_2 was significantly dependent on pH and ionic strength. The presence of SHA slightly enhanced the sorption of U(VI) on TiO_2 below pH 4.0, while it inhibited U(VI) sorption in the higher pH range. U(VI)sorption on TiO_2 was favored at high temperatures, and the sorption process was estimated to be endothermic and spontaneous. Reduction of U(VI) to lower valent species was confirmed by X-ray photo-electron spectroscopy analysis. It is very interesting to find that U(VI) sorption on TiO_2 was promoted in solutions with higher back-ground electrolyte concentrations. In the presence of U(VI), higher back-ground electrolyte made more TiO_2 particles aggregate through(001) facets, leading more(101) facets to be exposed. Therefore, the reduction of U(VI) was enhanced by the exposed(101) facets and more U(VI) removal was observed. 关键词：SORPTION URANIUM TiO2 IONIC strength Soil HUMIC ACID

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Sorption of uranyl ions on TiO_2:Effects of pH,contact time,ionic strength,temperature and HA

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