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Host Mediated Synthesis of Cobalt Aluminate/γ-Alumina Nanoflakes: a Dispersible Composite Pigment with High Catalytic Activities.
MedLine Citation:
PMID:  22122010     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Cobalt aluminate/γ-alumina (CoAl2O4/γ-Al2O3) nanocomposite pigment with mesoporous structure has been synthesized. The method simply involves adsorption of Co2+ ion on the surface of a commercially available boehmite (AlOOH) powder followed by the reaction of Co2+ and AlOOH at relatively low temperature (500 °C) to obtain CoAl2O4/γ-Al2O3 composite nanopowders. The formation of γ-Al2O3 from boehmite induces the in situ generation of isostructural CoAl2O4 (both crystallize as cubic spinel) at such a low temperature. The obtained intense blue powder of optimal composition (53.6 wt% CoAl2O4 in γ-Al2O3) can be dispersed in glycerol and characterized by UV-visible, X-ray diffraction, Raman spectroscopy, TEM and nitrogen sorption analyses. Raman studies confirm the formation of CoAl2O4 phase in γ-Al2O3. TEM studies reveal the formation of flake shaped (5-10 nm in width and 10-20 nm in length) nanopowders, and these flakes are assembled to form mesoporous structure. The specific surface area, total pore volume and average pore diameter of this powder are estimated to be ~118 m2g-1, 0.1375 cm3g-1 and 4.65 nm, respectively. This composite nanopowder has been used as an active catalyst for the decomposition of H2O2 at room temperature and the decomposition follows the first order kinetics with rate constant value close to 2.3 x 10-2 min-1. This pigment nanopowder can be reused for several cycles without noticeable degradation of its original catalytic activity.
Authors:
Anirban Dandapat; Goutam De
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-28
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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