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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2015,Vol.31>> Issue(9)>> 1815-1822     doi: 10.3866/PKU.WHXB201507201         中文摘要
PHYSICAL CHEMISTRY OF MATERIALS
Fast Adsorption Removal of Congo Red on Hierarchically Porous γ-Al2O3 Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method
NIE Long-Hui1,2, TAN Qiao1, ZHU Wei1, WEI Qi1, LIN Zhi-Kui1
1 School of Chemistry and Chemical Engineering, Hubei University of Technology, Wuhan 430068, P. R. China;
2 The Synergistic Innovation Center of Catalysis Materials of Hubei Province, Wuhan 430068, P. R. China
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Hierarchical nanostructured γ-Al2O3 hollow microspheres were synthesized from KAl(SO4)2 and urea precursors by the microwave-assisted hydrothermal (MAH) method at 180 ℃ for 20 min followed by calcination at 600 ℃ for 2 h. The as-prepared sample was used to remove the organic dye Congo red (CR) from aqueous solution. The results showed that the obtained γ-Al2O3 hollow microspheres are about 0.8-1.0 μm in diameter with a shell thickness of approximately 200 nm. The γ-Al2O3 hollow microspheres have a high surface area of 243 m2·g-1 and a hierarchical meso-macroporous structure, which is beneficial for mass transfer in liquid processes. Therefore, the prepared γ-Al2O3 hollow microspheres exhibit faster adsorption and enhanced adsorption performance for CR than particles prepared by the hydrothermal method and commercial γ-Al2O3. The adsorption kinetic data follow the pseudo-second-order equation and the equilibrium data fit well to the Langmuir model. The maximum adsorption capacity (qmax) of the obtained γ-Al2O3 hollow microspheres calculated by the Langmuir model is up to 515.4 mg·g-1 at 25 ℃. The γ-Al2O3 hollow microspheres prepared by the microwave-assisted hydrotherm method show promise as an adsorbent for environmental applications due to their hierarchical porous structure, high surface area, large pore volume, and adsorption capacity.



Keywords: Hierarchically porous material   γ-Al2O3   Congo red   Adsorption kinetics  
Received: 2015-04-03 Accepted: 2015-07-20 Publication Date (Web): 2015-07-20
Corresponding Authors: NIE Long-Hui Email: nielonghui@mail.hbut.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (51572074), Natural Science Foundation of Hubei Province, China (2011CDB079), Hubei College Student Innovation Training Project, China (201310500017), and Open Fund of Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, China (CHCL12003).

Cite this article: NIE Long-Hui, TAN Qiao, ZHU Wei, WEI Qi, LIN Zhi-Kui. Fast Adsorption Removal of Congo Red on Hierarchically Porous γ-Al2O3 Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method[J]. Acta Phys. -Chim. Sin., 2015,31 (9): 1815-1822.    doi: 10.3866/PKU.WHXB201507201

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