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Facet-Dependent Selective Adsorption of Mn-Doped alpha-Fe2O3 Nanocrystals toward Heavy-Metal Ions
Yuan, Qinglin1,2,3; Li, Pengfei1,2; Liu, Jun1,2; Lin, Yue3; Cai, Yunyu1,2; Ye, Yixing1,2; Liang, Changhao1,2,3
2017-12-12
Source PublicationCHEMISTRY OF MATERIALS
ISSN0897-4756
Volume29Issue:23Pages:10198-10205
Abstract

Engineering exposed active facets by doping impurities can dramatically modify the morphology and physicochemical properties of nanocrystalline hematite. In the work described in this paper, through the combination of laser ablation in liquid and hydrothermal treatment techniques, faceted Mn-doped alpha-Fe2O3 nanocrystals (NCs) were prepared by adjusting the doping level of elemental Mn. With the increase of Mn doping level, the hematite crystal evolved sequentially from isotropic polyhedral nanoparticles (NPs) to {116}-faceted saucer-shaped nanosheets (NSs), and then to {001}-faceted hexagonal NSs. Electrochemical stripping tests revealed that the Mn-doped alpha-Fe2O3 NCs show a facet-dependent adsorption ability toward Pb(II), Cd(II), and Hg(II) heavy-metal ions; that is, {001}-faceted hexagonal NSs exhibit high and selective adsorption toward Pb2+ ions, while {116}-faceted saucer-shaped NSs present strong and selective adsorption toward Cd2+ and Hg2+ ions. Density functional theory (DFT) calculations found that Pb2+ and Cd2+ ions have the highest adsorption energy on the {001} and {116} facet, respectively, while Hg2+ ions have the largest adsorption energy on the {110} facet. Carved with a variety of facets, such as {012} and {104} facets with weak and even positive adsorption energy, polyhedral NPs show poor adsorption ability and nonselective adsorption toward the three heavy-metal ions selected. Our experimental and computational results not only provide new insights into the facet-related properties, but also guide the design of crystals with exposed active facets for specific applications.

DOI10.1021/acs.chemmater.7b04114
WOS KeywordSENSING PROPERTIES ; PHOTOELECTROCHEMICAL PERFORMANCE ; HEMATITE NANOCRYSTALS ; VISIBLE-LIGHT ; NANOSTRUCTURES ; CRYSTALS ; WATER ; NANOSHEETS ; SYSTEMS ; OXIDE
Indexed BySCI
Language英语
Funding ProjectNational Key Basic Research Program of China[2014CB931704] ; National Natural Science Foundation of China[11304315] ; National Natural Science Foundation of China[51401206] ; National Natural Science Foundation of China[11404338] ; National Natural Science Foundation of China[51371166] ; National Natural Science Foundation of China[51571186] ; National Natural Science Foundation of China[11504375] ; Chinese Academy of Sciences/State Administration of Foreign Experts Affairs (CAS/SAFEA)
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000418206600040
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/34923
Collection中科院固体物理研究所
Corresponding AuthorLiang, Changhao
Affiliation1.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Anhui, Peoples R China
2.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Solid State Phys, Anhui Key Lab Nanomat & Nanotechnol, Hefei 230031, Anhui, Peoples R China
3.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Qinglin,Li, Pengfei,Liu, Jun,et al. Facet-Dependent Selective Adsorption of Mn-Doped alpha-Fe2O3 Nanocrystals toward Heavy-Metal Ions[J]. CHEMISTRY OF MATERIALS,2017,29(23):10198-10205.
APA Yuan, Qinglin.,Li, Pengfei.,Liu, Jun.,Lin, Yue.,Cai, Yunyu.,...&Liang, Changhao.(2017).Facet-Dependent Selective Adsorption of Mn-Doped alpha-Fe2O3 Nanocrystals toward Heavy-Metal Ions.CHEMISTRY OF MATERIALS,29(23),10198-10205.
MLA Yuan, Qinglin,et al."Facet-Dependent Selective Adsorption of Mn-Doped alpha-Fe2O3 Nanocrystals toward Heavy-Metal Ions".CHEMISTRY OF MATERIALS 29.23(2017):10198-10205.
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