Enhanced Removal of Uranium(VI) by Nanoscale Zerovalent Iron Supported on Na-Bentonite and an Investigation of Mechanism

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	Enhanced Removal of Uranium(VI) by Nanoscale Zerovalent Iron Supported on Na-Bentonite and an Investigation of Mechanism
	Sheng, GD ; Shao, XY ; Li, YM ; Li, JF ; Dong, HP ; Cheng, W ; Gao, X ; Huang, YY
刊名	JOURNAL OF PHYSICAL CHEMISTRY A
	2014
卷号	118 期号:16 页码:2952—2958
关键词	ZERO-VALENT IRON PILLARED BENTONITE AQUEOUS-SOLUTION HUMIC-ACID REMEDIATION REDUCTION WATER CLAY NANOPARTICLES ORGANOBENTONITE
ISSN号	1089-5639
通讯作者	liym@usx.edu.cn
英文摘要	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. First, Na-bent can buffer the pH in reaction media, besides preventing NZVI from aggregation. Second, Na-bent promoted the mass transfer of U(VI) from solution to NZVI surface, leading to the enhanced removal efficiency. Third, 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.
收录类别	SCI
语种	英语
WOS记录号	WOS:000335114000010
公开日期	2015-03-13
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/14118]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Sheng, GD,Shao, XY,Li, YM,et al. Enhanced Removal of Uranium(VI) by Nanoscale Zerovalent Iron Supported on Na-Bentonite and an Investigation of Mechanism[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2014,118(16):2952—2958.
APA	Sheng, GD.,Shao, XY.,Li, YM.,Li, JF.,Dong, HP.,...&Huang, YY.(2014).Enhanced Removal of Uranium(VI) by Nanoscale Zerovalent Iron Supported on Na-Bentonite and an Investigation of Mechanism.JOURNAL OF PHYSICAL CHEMISTRY A,118(16),2952—2958.
MLA	Sheng, GD,et al."Enhanced Removal of Uranium(VI) by Nanoscale Zerovalent Iron Supported on Na-Bentonite and an Investigation of Mechanism".JOURNAL OF PHYSICAL CHEMISTRY A 118.16(2014):2952—2958.