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New insights into the primary roles of diatomite in the enhanced sequestration of UO22+ by zerovalent iron nanoparticles: An advanced approach utilizing XPS and EXAFS
Sheng, GD; Yang, PJ; Tang, YN; Hu, QY; Li, H; Ren, XM; Hu, BW; Wang, XK; Huang, YY; Hu, BW (reprint author), Shaoxing Univ, Coll Yuanpei Coll Med Sci, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China.; Sheng, GD (reprint author), North China Elect Power Univ, Sch Chem & Environm, Beijing 102206, Peoples R China.
2016
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume193Issue:-Pages:189—197
Subtype期刊文献
AbstractIn the current paper, nanoscale zero-valent iron (NZVI) was immobilized onto the negatively-charged diatomite to obtain a novel composite (NZVI-D) for the enhanced sequestration of uranyl (U(VI)) in water. The as-synthesized NZVI-D was characterized by SEM, TEM and XRD in detail, and better dispersion of NZVI on diatomite surface was observed, as compared with bare NZVI. The efficiency of U(VI) sequestration by NZVI-D was compared with that of commercial iron and bare NZVI. It was found that NZVI-D exhibits the best efficiency in U(VI) sequestration, showing obvious synergistic effect between diatomite adsorption and NZVI reduction. The primary roles were further revealed by complementary macroscopic and spectroscopic studies. XPS results indicated that reduction of highly toxic and mobile UO22+ into less toxic and mobile UO2 could be enhanced using diatomite-supported NZVI. EXAFS analysis demonstrated that diatomite could react as a scavenger for insoluble products like UO2, and thus more reactive sites could be used for U(VI) reduction. Besides, diatomite play multiple roles on pH buffering and preventing NZVI from aggregating and as adsorbent of Fe(II) produced in-situ during reaction for further U(VI) reduction. This study opens a new avenue for the practical application of NZVI and NZVI-D in environmental remediation. (C) 2016 Elsevier B.V. All rights reserved.
KeywordZero-valent Iron In-situ Remediation Humic Substance Interaction Permeable Reactive Barrier Anoxic Batch Systems Weak Magnetic-field Aqueous-solution Uranium Removal Waste-water Carbon Nanotubes
DOI10.1016/j.apcatb.2016.04.035
Indexed BySCI
Language英语
WOS IDWOS:000377234800020
Citation statistics
Cited Times:100[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25785
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorSheng, GD; Hu, BW (reprint author), Shaoxing Univ, Coll Yuanpei Coll Med Sci, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China.; Sheng, GD (reprint author), North China Elect Power Univ, Sch Chem & Environm, Beijing 102206, Peoples R China.
Recommended Citation
GB/T 7714
Sheng, GD,Yang, PJ,Tang, YN,et al. New insights into the primary roles of diatomite in the enhanced sequestration of UO22+ by zerovalent iron nanoparticles: An advanced approach utilizing XPS and EXAFS[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2016,193(-):189—197.
APA Sheng, GD.,Yang, PJ.,Tang, YN.,Hu, QY.,Li, H.,...&Sheng, GD .(2016).New insights into the primary roles of diatomite in the enhanced sequestration of UO22+ by zerovalent iron nanoparticles: An advanced approach utilizing XPS and EXAFS.APPLIED CATALYSIS B-ENVIRONMENTAL,193(-),189—197.
MLA Sheng, GD,et al."New insights into the primary roles of diatomite in the enhanced sequestration of UO22+ by zerovalent iron nanoparticles: An advanced approach utilizing XPS and EXAFS".APPLIED CATALYSIS B-ENVIRONMENTAL 193.-(2016):189—197.
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