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Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: pH-Dependent Formation of AACH Microfibers and Nanorods and Their in Situ Transformation to Alumina Nanocrstals with Mesoporous Structure
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 946-951)
Author(s): Hui Liu, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, China 710021
Hong-jun Sun, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, China 710021
Xuan-meng He, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, China 710021
Zhen-feng Zhu, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, China 710021
Abstract: Through a simple hydrothermal and thermal decomposition process of the ammonium aluminum carbonate hydroxide (denoted as AACH) precursors, we prepared γ-Al2O3 microfibers and nanorods with mesoporous structure by manipulating the amount of a base in the reaction mixture (i.e., pH control). The lower pH value conditions (pH≈2.5) turned out to be favored toward the formation of the microfibers, and the higher pH value conditions (pH≈5.0) towards the formation of nanorods. The as-formed precursors could transform to the cubic γ-Al2O3 with the same morphology and a slight shrinkage in diameter after an annealing process. N2 adsorption-desorption experiment indicates that the as-synthesized alumina microfibers and nanorods have large surface area (230m2/g and 176 m2/g, respectively) and narrow pore-size distributions. Both the γ-Al2O3 microfibers and nanorods are powerful in the removal of Congo red pollutant from waste water.
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