Adsorption of U(VI) on sericite in the presence of Bacillus subtilis: A combined batch, EXAFS and modeling techniques

doi:10.1016/j.gca.2016.02.012

CORC > 合肥物质科学研究院 > 中国科学院合肥物质科学研究院 > 中科院等离子体物理研究所

	Adsorption of U(VI) on sericite in the presence of Bacillus subtilis: A combined batch, EXAFS and modeling techniques
	Sun, Yubing 1,2,3,4; Zhang, Rui 1; Ding, Congcong 1; Wang, Xiangxue 1; Cheng, Wencai 1; Chen, Changlun 1,3,4; Wang, Xiangke 1,2,3,4,5
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2016-05-01
卷号	180 期号:无页码:51-65
DOI	10.1016/j.gca.2016.02.012
文献子类	Article
英文摘要	The effect of Bacillus subtilis (B. subtilis) on the adsorption of U(VI) onto sericite was investigated using batch, EXAFS and modeling techniques. The batch adsorption indicated that the increased adsorption of U(VI) on sericite + B. subtilis systems at pH < 5.0 was predominantly attributed to the formation of inner-sphere complexes between U(VI) and surface functional groups of B. subtilis, whereas the inhibited adsorption was observed at pH > 6.0 due to the combination of deprotonated carboxyl groups of B. subtilis with the hydroxyl of sericite. The slightly enhanced adsorption of U(VI) on sericite + B. subtilis with increasing CO2 contents at pH < 6.0 was ascribed to the electrostatic attraction between positively charged U(VI) species (UO22+ species) and negatively charged surface of sericite + B. subtilis, whereas the U(VI) adsorption sharply decreased at pH > 7.0 owing to electrostatic repulsion between negatively charged sericite + B. subtilis and negatively charged U(VI) species such as UO2(OH)(3)(-) or UO2(CO3)(2)(2-) species. According to EXAFS analysis, the increased adsorption mechanism of U(VI) on sericite + B. subtilis at pH 4.0 was attributed to the formation of U-P shell, whereas the bidentate inner-sphere surface complexes was also observed at pH 7.0 due to the formation of U-C shell (2.92A angstrom) and/or U-Si/Al (3.18 angstrom) shell. Under the range of allowable error, the pH-dependent and isothermal adsorption of U(VI) on sericite + B. subtilis can be fitted by surface complexation modeling using ion exchange and surface complexation reaction by using equilibrium parameters obtained from each binary systems. These findings are important to understand the fate and transport of U(VI) on the mineral- bacteria ternary systems in the near-surface environment. (C) 2016 Elsevier Ltd. All rights reserved.
WOS关键词	EXTRACELLULAR POLYMERIC SUBSTANCES ; ABSORPTION FINE-STRUCTURE ; SURFACE COMPLEXATION MODEL ; GRAPHENE OXIDE NANOSHEETS ; AQUEOUS-SOLUTION ; URANIUM(VI) ADSORPTION ; STRUCTURE SPECTROSCOPY ; BACTERIAL SURFACES ; FTIR-SPECTROSCOPY ; URANYL ADSORPTION
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000372566600004
资助机构	Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Natural Science Foundation of China(41273134 ; Deanship of Scientific Research (DSR), King Abdulaziz University(41-130-36-HiCi) ; Deanship of Scientific Research (DSR), King Abdulaziz University(41-130-36-HiCi) ; Deanship of Scientific Research (DSR), King Abdulaziz University(41-130-36-HiCi) ; 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内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/21661]
专题	合肥物质科学研究院_中科院等离子体物理研究所
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China 2.North China Elect Power Univ, Sch Environm & Chem Engn, Beijing 102206, Peoples R China 3.Soochow Univ, Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiat Med, Suzhou 215123, Peoples R China 4.Soochow Univ, Sch Radiol & Interdisciplinary Sci, Suzhou 215123, Peoples R China 5.King Abdulaziz Univ, NAAM Res Grp, Fac Sci, Jeddah 21589, Saudi Arabia
推荐引用方式 GB/T 7714	Sun, Yubing,Zhang, Rui,Ding, Congcong,et al. Adsorption of U(VI) on sericite in the presence of Bacillus subtilis: A combined batch, EXAFS and modeling techniques[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2016,180(无):51-65.
APA	Sun, Yubing.,Zhang, Rui.,Ding, Congcong.,Wang, Xiangxue.,Cheng, Wencai.,...&Wang, Xiangke.(2016).Adsorption of U(VI) on sericite in the presence of Bacillus subtilis: A combined batch, EXAFS and modeling techniques.GEOCHIMICA ET COSMOCHIMICA ACTA,180(无),51-65.
MLA	Sun, Yubing,et al."Adsorption of U(VI) on sericite in the presence of Bacillus subtilis: A combined batch, EXAFS and modeling techniques".GEOCHIMICA ET COSMOCHIMICA ACTA 180.无(2016):51-65.