Effect of environmental conditions on the sorption of uranium on Fe3O4@MnO2 hollow spheres
Effect of environmental conditions on the sorption of uranium on Fe3O4@MnO2 hollow spheres
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环境条件对Fe3O4@MnO2空心球吸附铀的影响
DOI：
10.1016/j.molliq.2016.07.136
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发表时间：
2016-11
影响因子：
6
通讯作者：
Xu Jinzhang
中科院分区：
文献类型：
--
作者：
Zhang Jian;Guo Zhiqiang;Li Yuan;Pan Shuhao;Chen Xinlei;Xu Jinzhang
本文采用水热法制备了Fe3O4@MnO2空心球，用于去除水溶液中的铀(VI)。采用间歇法考察了接触时间、pH值、离子强度、固含量和温度等因素的影响。在pH<7的范围内，U(VI)的吸附依赖于离子强度，表明在该pH范围内，静电相互作用和/或外球表面络合是主要的吸附机制。相反，离子强度对pH=7的吸附行为的影响可以忽略不计，表明发生了球内表面络合作用。确定了典型的吸附等温线(Langmuir、Freundlich、Dubinin-Raduskevich)。在293℃时，Fe3O4@MnO2空心球对U(VI)的最大吸附量达到13.95 mg/g。根据温度等温线计算了热力学参数，结果表明，U(VI)在Fe3O4@MnO2空心球上的吸附是一个自发的吸热过程。研究结果对铀(VI)污染管理的应用具有重要意义。
Herein, the hydrothermal method was adopted to synthesize Fe3O4@MnO2hollow spheres for the removal of U(VI) from aqueous solution. The effects of contact time, pH, ionic strength, solid content and temperature were investigated by using a batch technique. The sorption of U(VI) was dependent on ionic strength at pH < 7, suggesting that electrostatic interaction and/or outer-sphere surface complexation was the predominant sequestration mechanism within this pH range. In contrast, the ignorable effect of ionic strength on the sorption behaviors at pH > 7 pointed to the occurrence of inner-sphere surface complexation. Typical sorption isotherms (Langmuir, Freundlich, Dubinin-Raduskevich) were determined for the mechanism of sorption process. The maximum sorption amount of U(VI) on Fe3O4@MnO2hollow spheres reached to 13.95 mg/g at 293 K. The thermo-dynamic parameters were calculated from the temperature isotherms, and the results suggested that U(VI) sorption on Fe3O4@MnO2hollow spheres was a spontaneous and endothermic process. The results might be important for the application for U(VI) pollution management.
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影响因子：
1.6
作者：
Baowei Hu;W. Cheng;Hui Zhang;G. Sheng
通讯作者：
Baowei Hu;W. Cheng;Hui Zhang;G. Sheng
DOI：
10.1524/ract.1994.6667.special-issue.63
发表时间：
1994
期刊：
--
影响因子：
--
作者：
J. Hering;S. Kraemer
通讯作者：
J. Hering;S. Kraemer
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影响因子：
13.6
作者：
Yang, Shitong;Li, Jiaxing;Wang, Xiangke
通讯作者：
Wang, Xiangke
影响因子：
12.8
作者：
Akhtar, Kalsoom;Akhtar, M. Waheed;Khalid, Ahmad M.
通讯作者：
Khalid, Ahmad M.
影响因子：
9.6
作者：
D. Shao;Di Xu;Suowei Wang;Q. Fang;Wang-suo Wu;Yun-hui Dong;Xiangke Wang
通讯作者：
D. Shao;Di Xu;Suowei Wang;Q. Fang;Wang-suo Wu;Yun-hui Dong;Xiangke Wang