Citation: NIE Long-Hui, TAN Qiao, ZHU Wei, WEI Qi, LIN Zhi-Kui. Fast Adsorption Removal of Con Red on Hierarchically Porous γ-Al₂O₃ Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method[J]. Acta Physico-Chimica Sinica, ;2015, 31(9): 1815-1822. doi: 10.3866/PKU.WHXB201507201 shu

Fast Adsorption Removal of Con Red on Hierarchically Porous γ-Al₂O₃ Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method

NIE Long-Hui ^1,2, ,
TAN Qiao ¹ ,
ZHU Wei ¹ ,
WEI Qi ¹ ,
LIN Zhi-Kui ¹

1.
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

Received Date: 3 April 2015
Available Online: 20 July 2015
Fund Project: 国家自然科学基金(51572074) (51572074) 湖北省自然科学基金(2011CDB079) (2011CDB079) 湖北省大学生创新训练项目(201310500017) (201310500017)中南民族大学催化与材料科学重点实验室开放基金(CHCL12003)资助 (CHCL12003)

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 Con 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 (q_max) 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.
- Hierarchically porous material,
- γ-Al₂O₃,
- Con red,
- Adsorption kinetics
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Fast Adsorption Removal of Con Red on Hierarchically Porous γ-Al₂O₃ Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method