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Synthesis, characterization, thermodynamic and kinetic investigations on uranium(Ⅵ) adsorption using organic-inorganic composites: Zirconyl-molybdopyrophosphate-tributyl phosphate

查看全文 作　　者：ZHOU [1]ShiMin;CHEN [1,3]BaiHua;LI [1]Yuan;GUO [1]JingWei;CAI [1]XiaoJiaoX;CAI [1]XiaoJiao;QIN [2]Zhi;BAI [2]Jing;NA [1]Ping 高影响力作者 机构地区：[1]School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;[2]Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;[3]Institute of Nuclear physics and chemistry, Chinese Academy of Engineering Physics, Mianyang 621900, China高影响力机构 出　　处：《Science China Chemistry》索引2013年第56卷第11期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (21276193);the National High-Tech Research & Development Program of China (863 Program; 2012AA063504);the Tianjin Natural Science Foundation (2013F1-0033);Project of Ocean with Scientific Technology in Tianjin (KJXH2011-10) 摘　　要：Zirconyl-molybdopyrophosphate-tributyl phosphate(ZMPP-TBP)was a novel organic-inorganic composite adsorbent prepared by co-precipitation method and used in the adsorption of uranium from aqueous solution in batch adsorption experiments.The as-obtained product was characterized using SEM,energy dispersive X-ray spectroscopy(EDX),XRD and BET-N2adsorption measurements.The study had been conducted to investigate the effects of solution pH,temperature,contact time,initial concentration and coexisting ions.A maximum removal of 99.31%was observed for an initial concentration 5 mg/L,at pH6.0 and an adsorbent dose of 1.0 g/L.The isothermal data were fitted with both Langmuir and Freundlich equations,but the data fitted the former better than the latter.According to the evaluation using the Langmuir equation,the maximum adsorption capacity of uranium(Ⅵ)was 196.08 mg/g at 293 K and pH 6.0.The pseudo-first-order kinetic model and pseudo-second-order kinetic model were used to describe the kinetic data,and the pseudo-second-order kinetic model was better.The thermodynamic parameterΔG was calculated,the negativeΔG values of uranium(VI)at different temperature showed that the adsorption process was spontaneous.The good reusability of ZMPP-TBP also indicated that the ZMPP-TBP was a very promising adsorbent for uranium adsorption from aqueous solution. 关 键 词：一级动力学模型 吸附热力学 铀(VI) 无机复合材料 磷酸三丁酯 LANGMUIR方程 表征 复合吸附剂
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