铀
尾矿
吸附
朗缪尔吸附模型
核化学
化学
介孔二氧化硅
介孔材料
渗滤液
过氧化氢
材料科学
环境化学
冶金
催化作用
有机化学
物理化学
作者
Junjie Lian,Yalan Liu,Lijie Chen,Le Li,Dexin Ding,Dai Zhang
标识
DOI:10.1016/j.jece.2022.108914
摘要
Herein, calcium peroxide modified mesoporous silica (CPMS) was successfully synthesized by a facile strategy and used for simultaneous adsorption and immobilization of U(VI) from uranium-containing wastewater. The batch uranium adsorption experiments reveal excellent adsorption performance of CPMS over a wide pH value. In comparison to calcium peroxide and mesoporous silica, the CPMS showed a great improvement in the removal capacity of uranium. As well, the pseudo-second-order model and Langmuir isotherm model provided a well description of adsorption kinetics and isotherm, respectively, which suggested the monolayer chemisorption governed the adsorption of CPMS for U(VI). In addition, the Langmuir isotherm model calculated the maximum adsorption capacity of CPMS for U(VI) up to 613.50 mg/g. Based on mechanistic studies of XPS, FT-IR, TEM and XRD, U(VI) is predominantly removed through synergistic adsorption of U(VI) by mesoporous silicon and immobilization of U(VI) by calcium peroxide as (UO2)O2•2 H2O (metastudtite). Furthermore, the efficient removal ability of CPMS for U(VI) in uranium tailings leachate was confirmed by column test, the U(VI) concentration of uranium tailings leachate can be reduced from 180.4 μg/L to 2.3 μg/L in 1895.2-bed volumes, which was well lower than the standard limit of WHO for U(VI) concentration in drinking water. This research provides a feasible approach and new idea for the efficient treatment of radioactive wastewater.
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