物理化学学报 >> 2015, Vol. 31 >> Issue (9): 1815-1822.doi: 10.3866/PKU.WHXB201507201

材料物理化学 上一篇    

分级多孔γ-Al2O3空心微球微波水热法制备及其对刚果红的快速吸附

聂龙辉1,2(),谭侨1,朱玮1,魏琪1,林志奎1   

  1. 1 湖北工业大学化学化工学院,武汉430068
    2 湖北省催化材料协同创新中心,武汉430068
  • 收稿日期:2015-04-03 发布日期:2015-09-06
  • 基金资助:
    国家自然科学基金(51572074);湖北省自然科学基金(2011CDB079);湖北省大学生创新训练项目(201310500017);中南民族大学催化与材料科学重点实验室开放基金(CHCL12003)

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

Long-Hui. NIE1,2(),Qiao. TAN1,Wei. ZHU1,Qi. WEI1,Zhi-Kui. LIN1   

  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:2015-04-03 Published:2015-09-06
  • 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);Open Fund of Key Laboratory of Catalysis andMaterials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, China(CHCL12003)

摘要:

以KAl(SO4)2和尿素为前驱体,通过微波水热法于180 ℃反应20 min,经600 ℃焙烧2 h制得分级多孔γ-Al2O3空心微球.所制备的样品被用于吸附典型有机染料刚果红(CR)溶液.结果表明,制备的γ-Al2O3空心微球直径为0.8-1.0 μm,厚度约为200 nm.此γ-Al2O3空心微球具有高的比表面积(243 m2·g-1)和分级大孔-中孔结构,此结构非常有利于液相过程中的质量传递.微波水热法制备的γ-Al2O3空心微球比水热法制备的γ-Al2O3和商用的γ-Al2O3样品显示出更快和更强的吸附性能.此样品的吸附数据很好地符合假二级速率方程和Langmuir吸附理论模型.从Langmuir吸附理论模型计算得到微波水热法制备的γ-Al2O3空心微球的最大吸附量(qmax) 25 ℃时高达515.4 mg·g-1.由于具有分等级结构、高比表面积、大的孔容和吸附能力,微波水热法制备的γ-Al2O3空心微球样品有望成为一种具有很好应用潜力的环境吸附剂.

关键词: 分级多孔材料, γ-Al2O3, 刚果红, 吸附动力学

Abstract:

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.

Key words: Hierarchically porous material, γ-Al2O3, Congo red, Adsorption kinetics

MSC2000: 

  • O647