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Characterization of adsorbed arsenate on amorphous and nano crystalline MgFe-layered double hydroxides

Title
Characterization of adsorbed arsenate on amorphous and nano crystalline MgFe-layered double hydroxides
Author
박주양
Keywords
MgFe-layered double hydroxide; Arsenate; Nanoparticles; Amorphous; Crystallite sorption; Health safety
Issue Date
2011-02
Publisher
SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Citation
JOURNAL OF NANOPARTICLE RESEARCH; FEB 2011, 13 2, p887-p894, 8p.
Abstract
This article investigated sorption of toxic and carcinogenic arsenate (AsO4 (3-)) ions on positively charged surface of amorphous and nano crystalline MgFe-layered double hydroxides (LDHs). Based on Brunauer-Emmett-Teller (BET) and Transmission Electron Microscopy (TEM), average size, and specific surface area of nano crystalline MgFe-LDHs, which was about range of about 50-200 nm and 90.2 m(2)/g, was lower and higher when compared to them of amorphous MgFe-LDHs, respectively. In addition, X-ray diffraction (XRD) peak and point of zero charge (PZC) of crystalline MgFe-LDHs was higher intensity and same, respectively, when compared to that of nano crystalline FeMg-LDHs. Adsorption rate of arsenate on amorphous MgFe-LDHs was a little faster when compared to that of nano crystalline MgFe-LDHs. In addition, as pH decreased, adsorption amount of arsenate on amorphous MgFe-LDHs increased significantly when compared to that of nano crystalline MgFe-LDHs. These results indicate that mechanism of arsenate in two materials was significantly different. We investigate sorption characteristic at pH 5, based on XRD and Fourier-transformed infrared (FTIR). In amorphous MgFe-LDHs, ferric arsenate precipitate was formed on surface of amorphous MgFe-LDHs and constituted the predominant surface arsenate. However, in nano crystalline MgFe-LDHs, arsenate was dominantly sorbed as a "non-surface-complexed" As-O bond on surface and anion exchange in interlayer.
URI
http://search.proquest.com.ssl.access.hanyang.ac.kr/docview/1111850084?accountid=11283http://hdl.handle.net/20.500.11754/35628
ISSN
1388-0764
DOI
10.1007/s11051-010-9936-z
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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