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Solvothermal Conversion of Nanofiber to Nanorod‐Like Mesoporous γ‐ Al 2 O 3 Powders, and Study Their Adsorption Efficiency for Congo Red
Author(s) -
Ghosh Sourav,
Naskar Milan Kanti
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12368
Subject(s) - nanorod , materials science , mesoporous material , chemical engineering , nanofiber , calcination , adsorption , nuclear chemistry , nanotechnology , chemistry , catalysis , organic chemistry , engineering
Mesoporous γ‐ Al 2 O 3 powders with nanofiber and nanorod‐like structures were synthesized using boehmite sols in the presence of triblock copolymer, P123 in ethanol by solvothermal process at different temparatures (100°C–165°C) followed by calcination at 400°C–1000°C. The powders were characterized by low‐ and wide‐angle X‐ray diffraction ( XRD ), N 2 adsorption–desorption, and transmission electron microscopy ( TEM ). The adsorption efficiency of the powders with Congo red ( CR ) was studied by UV –vis spectroscopy. The γ‐ Al 2 O 3 phase became stable up to 1000°C. The nanorods obtained at 165°C had narrower pore size distribution ( PSD ) than nanofibers synthesized at 100°C, the former showed higher CR adsorption efficiency. The stepwise growth mechanism of nanofibers to nanorods conversion with increase in solvothermal temperatures was illustrated.