Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite

	Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite
	Li ZJ(李子杰); Wang L(王琳); Yuan LY(袁立永); Mei L(梅雷); Zheng LR(郑黎荣); Zhang J(张静); Yang JH(杨巨华); Zhao YL(赵宇亮); Chai ZF(柴之芳); Shi WQ(石伟群)
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2015
卷号	290 页码:26-33
关键词	Zero-valent iron nanoparticles Graphene composites Uranium removal Reductive precipitation Hydrolysis precipitation
通讯作者	石伟群
英文摘要	Zero-valent iron nanoparticle (ZVI-np) and its graphene composites were prepared and applied in the removal of uranium under anoxic conditions. It was found that solutions containing 24 ppm U(VI) could be completely cleaned up by ZVI-nps, regardless of the presence of NaHCO3, humic acid, mimic groundwater constituents or the change of solution pH from 5 to 9, manifesting the promising potential of this reactive material in permeable reactive barrier (PRB) to remediate uranium-contaminated groundwater. In the measurement of maximum sorption capacity, removal efficiency of uranium kept at 100% until C-0(U) = 643 ppm, and the saturation sorption of 8173 mg U/g ZVI-nps was achieved at C-0(U) = 714 ppm. In addition, reaction mechanisms were clarified based on the results of SEM, XRD, XANES, and chemical leaching in (NH4)(2)CO3 solution. Partially reductive precipitation of U(VI) as U3O7 was prevalent when sufficient iron was available; nevertheless, hydrolysis precipitation of U(VI) on surface would be predominant as iron got insufficient, characterized by releases of Fe2+ ions. The dissolution of Fe-0 cores was assigned to be the driving force of continuous formation of U(VI) (hydr)oxide. The incorporation of graphene supporting matrix was found to facilitate faster removal rate and higher U(VI) reduction ratio, thus benefitting the long-term immobilization of uranium in geochemical environment. (C) 2015 Elsevier B.V. All rights reserved.
学科主题	Engineering; Environmental Sciences & Ecology
类目[WOS]	Engineering, Environmental ; Engineering, Civil ; Environmental Sciences
收录类别	SCI ; EI ; CA
WOS记录号	WOS:000353097000004
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228322]
专题	高能物理研究所_院士高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Li ZJ,Wang L,Yuan LY,et al. Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite[J]. JOURNAL OF HAZARDOUS MATERIALS,2015,290:26-33.
APA	李子杰.,王琳.,袁立永.,梅雷.,郑黎荣.,...&Shi, WQ.(2015).Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite.JOURNAL OF HAZARDOUS MATERIALS,290,26-33.
MLA	李子杰,et al."Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite".JOURNAL OF HAZARDOUS MATERIALS 290(2015):26-33.