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Enhanced removal of U(VI) by nanoscale zerovalent iron supported on Na-bentonite and an investigation of mechanism
| 题名： | Enhanced removal of U(VI) by nanoscale zerovalent iron supported on Na-bentonite and an investigation of mechanism |
| 正文语种： | 中文 |
| 作者： | Guodong Sheng Xiaoyu Shao Yimin Li Jianfa Li Huaping ong Wei Cheng Xing Gao Yuying Huang |
| 作者单位： | ollege of hemistry and hemical Engineering, Shaoxing University, Huancheng West Road 508, Shaoxing, Zhejiang 312000, P.R. hina Shanghai Synchrotron Radiation Facility(SSRF), Shanghai Institute of pplied Physics, hinese cademy of Sciences, Zhangheng Road 239, Shanghai 201204, P.R. hina |
| 关键词： | Bentonite nanoscale zero valent iron enhanced uranium removal |
| 摘要： | The reductive removal of U(VI) by nanoscale zerovalent iron (NZVI) was enhanced by using Na+-saturated bentonite (Na-bent) as the support,and the mechanism for the enhanced removal were investigated comprehensively.Under the same experimental conditions,NZVI supported on the negatively-charged Na-bent showed much higher removal efficiency (99.2%) of cationic U(VI) than either bare NZVI (48.3%) or NZVI supported on the positively-charged bentonite (Al-bent) did.Subsequent experimental investigations revealed the unique roles of bentonite on enhancing the reactivity and reusability of NZVI.Firstly,Na-bent can buffer the pH in reaction media,besides preventing NZVI from aggregation.Secondly,Na-bent promoted the mass transfer of U(VI) from solution to NZVI surface,leading to the enhanced removal efficiency.Thirdly,the bentonite may transfer some insoluble reduction products away from the iron surface according to X-ray absorption fine structure (XAFS) study.Finally,Na-bent as the adsorbent to Fe(II) makes it more reactive with U(VI),which enhanced stoichiometrically the reduction capacity of NZVI besides accelerating the reaction rate. |
| 会议日期： | 20141113 |
| 会议举办地点： | 杭州 |
| 会议名称： | 浙江省环境科学学会2014年学术年会 |
| 出版日期： | 2014-11-13 |
| 母体文献： | 浙江省环境科学学会2014年学术年会论文集 |
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