X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles

doi:10.1039/c6en00421k

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles
	Hu, BW; Ye, F; Ren, XM; Zhao, DL; Sheng, GD; Li, H; Ma, JY; Wang, XK; Huang, YY; 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.
	2016
发表期刊	ENVIRONMENTAL SCIENCE-NANO
ISSN	2051-8153
卷号	3 期号:6 页码:1460-1472
文章类型	期刊论文
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.
DOI	10.1039/c6en00421k
收录类别	SCI
语种	英语
WOS记录号	WOS:000391423400022
引用统计
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/26678
专题	中科院上海应用物理研究所2011-2018年
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.
推荐引用方式 GB/T 7714	Hu, BW,Ye, F,Ren, XM,et al. X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles[J]. ENVIRONMENTAL SCIENCE-NANO,2016,3(6):1460-1472.
APA	Hu, BW.,Ye, F.,Ren, XM.,Zhao, DL.,Sheng, GD.,...&Sheng, GD .(2016).X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles.ENVIRONMENTAL SCIENCE-NANO,3(6),1460-1472.
MLA	Hu, BW,et al."X-ray absorption fine structure study of enhanced sequestration of U(VI) and Se(IV) by montmorillonite decorated with zero-valent iron nanoparticles".ENVIRONMENTAL SCIENCE-NANO 3.6(2016):1460-1472.

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