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Efficient U(VI) Reduction and Sequestration by Ti2CTx MXene
Wang, L; Song, H; Yuan, LY; Li, ZJ; Zhang, YJ; Gibson, JK; Zheng, LR; Chai, ZF; Shi, WQ; Zheng LR(郑黎荣)
2018
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
EISSN1520-5851
Volume52Issue:18Pages:10748-10756
SubtypeArticle
AbstractAlthough reduction of highly mobile U(VI) to less soluble U(IV) has been long considered an effective approach to in situ environmental remediation of uranium, candidate reducing agents are largely limited to Fe-based materials and microbials. The importance of titanium-containing compounds in natural uranium ore deposits suggests a role for titanium in uranium migration. Herein, for the first time, a two-dimensional transition metal carbide, Ti2CTx, is shown to efficiently remove uranium via a sorption reduction strategy. Batch experiments demonstrate that TiC2Tx exhibits excellent U(VI) removal over a wide pH range, with an uptake capacity of 470 mg g(-1) at pH 3.0. The mechanism for U(VI) to U(IV) reduction by Ti2CTx was deciphered by X-ray absorption spectroscopy and diffraction and photoelectron spectroscopy. The reduced U(IV) species at low pH is identified as mononuclear with bidendate binding to the MXene substrate. At near-neutral pH, nanoparticles of the UO2+x phase adsorb to the substrate with some Ti2CTx transformed to amorphous TiO2. A subsequent in-depth study suggests Ti2CTx materials may be potential candidates for permeable reactive barriers in the treatment of wastewaters from uranium mining. This work highlights reduction-induced immobilization of U(VI) by Ti2CTx MXene including a pH-dependent reduction mechanism that might promote applications of titanium-based materials in the elimination of other oxidized contaminants.
DOI10.1021/acs.est.8b03711
WOS Keyword2-DIMENSIONAL TITANIUM CARBIDE ; ZERO-VALENT IRON ; SOLID-PHASE EXTRACTANT ; URANIUM(VI) ADSORPTION ; AQUEOUS-SOLUTIONS ; U-VI ; SURFACE ; MAGNETITE ; SORPTION ; REMOVAL
Indexed BySCI ; EI
Language英语
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000445441000057
EI Accession Number20183905861935
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/286350
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Wang, L,Song, H,Yuan, LY,et al. Efficient U(VI) Reduction and Sequestration by Ti2CTx MXene[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(18):10748-10756.
APA Wang, L.,Song, H.,Yuan, LY.,Li, ZJ.,Zhang, YJ.,...&郑黎荣.(2018).Efficient U(VI) Reduction and Sequestration by Ti2CTx MXene.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(18),10748-10756.
MLA Wang, L,et al."Efficient U(VI) Reduction and Sequestration by Ti2CTx MXene".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.18(2018):10748-10756.
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