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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; liym@usx.edu.cn
2014
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY A
ISSN1089-5639
Volume118Issue:16Pages:2952—2958
AbstractThe 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.
KeywordZero-valent Iron Pillared Bentonite Aqueous-solution Humic-acid Remediation Reduction Water Clay Nanoparticles Organobentonite
Indexed BySCI
Language英语
WOS IDWOS:000335114000010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/14118
Collection中科院上海应用物理研究所2011-2019年
Corresponding Authorliym@usx.edu.cn
Recommended Citation
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.,...&liym@usx.edu.cn.(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.
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