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题名: X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles
作者: Hu, BW; Ye, F; Ren, XM; Zhao, DL; Sheng, GD; Li, H; Ma, JY; Wang, XK; Huang, YY
刊名: ENVIRONMENTAL SCIENCE-NANO
出版日期: 2016
卷号: 3, 期号:6, 页码:1460-1472
DOI: 10.1039/c6en00421k
通讯作者: Sheng, GD (reprint author), Shaoxing Univ, Coll Chem & Chem Engn, Coll Life Sci, Coll Med Sci, Shaoxing 312000, Zhejiang, Peoples R China. ; Sheng, GD (reprint author), North China Elect Power Univ, Sch Chem & Environm, Beijing 102206, Peoples R China.
文章类型: 期刊论文
英文摘要: Herein, using Na-montmorillonite and Al-montmorillonite as templates, supported NZVI with superior reactivity, namely NZVI/Na-Mont and NZVI/Al-Mont, was synthesized and applied for enhanced sequestration of U(VI) and Se(IV). The results indicated that the negatively charged Na-Mont can effectively adsorb cationic U(VI), while the positively charged Al-Mont can adsorb anionic Se(IV), significantly enhancing the rate and extent of U(VI) and Se(IV) sequestration on NZVI due to the synergistic effect between adsorption and reduction. The inhibition effect of 1,10-phenanthroline demonstrated that surface-adsorbed Fe(II) on corrosion products and clay surfaces played an indispensable role in U(VI) and Se(IV) reduction, which was further confirmed by XPS identification. XANES analysis demonstrated that in the NZVI system, Na-Mont and Al-Mont promote the reductive transformation of U(VI) into U(IV), and Se(IV) into Se(0)/Se(-II), respectively. EXAFS analysis indicated the presence of Al/Si scattering for U(VI)-treated NZVI/Na-Mont and Se(IV)-treated NZVI/Al-Mont samples, revealing that Na-Mont and Al-Mont reacted as a scavenger for insoluble products like UO2 and FeSe, thereby, more reactive sites can be used for U(VI) and Se(IV) reduction. Our results suggested that the distinct structure of modified montmorillonite can be utilized for synthesizing supported NZVI to create properties compatible for enhanced enrichment of radionuclides, displaying potential application in nuclear waste management.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000391423400022
ISSN号: 2051-8153
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26678
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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