Novel Approach for Synthesis of Mesoporous γ-AlOOH Powder from Coal-Bearing Kaolinite and its Enhanced Adsorption Performance for Congo Red and Fluoride

Abstract:

Mesoporous boehmite (γ-AlOOH) was synthesized from naturally occurring coal-bearing kaolinite (CBK) by direct sulfuric acid leaching and hydrothermal method to explore a new possible route to the synthesis of product with high value added using the CBK. The Brunauner-Emmett-Teller (BET) surface area and the average crystallite size of the γ-AlOOH powder could be controlled in the range from 6.3 to 192.5 m² g^-1 and from 5.5 to 14.4 nm, respectively, by varying the reaction temperature and reaction time. Owing to its porous structure and high surface area, the synthesized mesoporous γ-AlOOH powder exhibited better adsorption abilities for CR and fluoride in contrast to commercial boehmite, and it only took 20 min to reach removal efficiency of 99.6% for CR and 90.5% for fluoride, when the initial concentration of CR and fluoride was 100 and 10 mg L^-1, respectively.

• Periodical: Solid State Phenomena (Volume 288)
• Pages: 79-86
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.288.79
• Online since: March 2019
• Authors: Quan Lai Yin, Si Qin Zhao, Sin Asuha*
• Keywords: Adsorption, Boehmite, Congo Red, Fluoride, Kaolinite

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