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Scalable route to mesoporous iron oxides and their Cr(VI) ions uptake capacity study
Alternative TitleMater. Chem. Phys.
Zhang, HaiTao1,2; Yang, Yang1; Bao, NiNa1; Ding, Jun1
2014-04-15
Source PublicationMATERIALS CHEMISTRY AND PHYSICS
ISSN0254-0584
Volume144Issue:3Pages:512-518
AbstractHere we demonstrate a simple and scalable synthetic route for preparing porous iron oxides with tunable porosity characteristics by using the high-energy mechanical ball milling technique. Nanocomposites composed of networked hematite encapsulated in silica were produced. Silica was utilized as scaffolds to form nanocomposites and then was etched off hydrothermally in a NaOH solution. The formation mechanism of porous iron oxides, effects of volume ratio of silica to magnetite, milling period, calcination temperature and concentration of NaOH solution were studied systematically. The formation process was monitored by applying a variety of techniques, such as scanning and transition electron microscopes (SEM and TEM), and X-Ray diffractometer (XRD). SEM and TEM studies revealed that a jellylike solid-state nanocomposite of silica and iron oxide was produced after milling process, and networked iron oxide structures encapsulated in silica displayed a high mass contrast and their grain size decreased with elongating milling period. Barrett-Joyner-Halender (BJH) method analysis indicated that the pore width and Brunauer-Emmett-Teller (BET) specific surface area of iron oxide decreased with the increase of milling period and volume ratio of silica to iron oxide, and porosity increased with increasing volume ratio of silica to iron oxide. Magnetic measurement revealed the superparamagnetic nature of the mesoporous materials at room temperature. Further, absorption capacity of Cr (VI) ions onto mesoporous magnetite was checked to evaluate its toxic ions uptake ability. (C) 2014 Elsevier B.V. All rights reserved.; Here we demonstrate a simple and scalable synthetic route for preparing porous iron oxides with tunable porosity characteristics by using the high-energy mechanical ball milling technique. Nanocomposites composed of networked hematite encapsulated in silica were produced. Silica was utilized as scaffolds to form nanocomposites and then was etched off hydrothermally in a NaOH solution. The formation mechanism of porous iron oxides, effects of volume ratio of silica to magnetite, milling period, calcination temperature and concentration of NaOH solution were studied systematically. The formation process was monitored by applying a variety of techniques, such as scanning and transition electron microscopes (SEM and TEM), and X-Ray diffractometer (XRD). SEM and TEM studies revealed that a jellylike solid-state nanocomposite of silica and iron oxide was produced after milling process, and networked iron oxide structures encapsulated in silica displayed a high mass contrast and their grain size decreased with elongating milling period. Barrett-Joyner-Halender (BJH) method analysis indicated that the pore width and Brunauer-Emmett-Teller (BET) specific surface area of iron oxide decreased with the increase of milling period and volume ratio of silica to iron oxide, and porosity increased with increasing volume ratio of silica to iron oxide. Magnetic measurement revealed the superparamagnetic nature of the mesoporous materials at room temperature. Further, absorption capacity of Cr (VI) ions onto mesoporous magnetite was checked to evaluate its toxic ions uptake ability. (C) 2014 Elsevier B.V. All rights reserved.
KeywordMagnetic Materials Nanostructures Electron Microscopy Oxides
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.matchemphys.2014.01.028
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCRYSTALLINE WALLS ; NANOPARTICLES ; ALPHA-FE2O3 ; GAMMA-FE2O3 ; CHROMIUM ; WATER
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000333493400042
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8199
Collection研究所(批量导入)
Affiliation1.Natl Univ Singapore, Dept Mat Sci & Engn, Fac Engn, Singapore 117574, Singapore
2.Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhang, HaiTao,Yang, Yang,Bao, NiNa,et al. Scalable route to mesoporous iron oxides and their Cr(VI) ions uptake capacity study[J]. MATERIALS CHEMISTRY AND PHYSICS,2014,144(3):512-518.
APA Zhang, HaiTao,Yang, Yang,Bao, NiNa,&Ding, Jun.(2014).Scalable route to mesoporous iron oxides and their Cr(VI) ions uptake capacity study.MATERIALS CHEMISTRY AND PHYSICS,144(3),512-518.
MLA Zhang, HaiTao,et al."Scalable route to mesoporous iron oxides and their Cr(VI) ions uptake capacity study".MATERIALS CHEMISTRY AND PHYSICS 144.3(2014):512-518.
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