分级多孔γ-Al_2O_3空心微球微波水热法制备及其对刚果红的快速吸附（英文）  

Fast Adsorption Removal of Congo Red on Hierarchically Porous γ-Al_2O_3 Hollow Microspheres Prepared by Microwave-Assisted Hydrothermal Method

作　　者：聂龙辉[1,2] 谭侨 朱玮[1] 魏琪[1] 林志奎 

机构地区：[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

出　　处：《物理化学学报》2015年第9期1815-1822,共8页Acta Physico-Chimica Sinica

基　　金：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 and Materials 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°C反应20 min,经600°C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0.8–1.0μm,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°C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.Hierarchical nanostructured γ-Al2O3 hollow microspheres were synthesized from KAl（SO4）2and urea precursors by the microwave-assisted hydrothermal（MAH） method at 180 °C for 20 min followed by calcination at 600 °C 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 about0.8–1.0 μm in diameter with a shell thickness of approximately 200 nm. The γ-Al2O3 hollow microspheres have a high surface area of 243 m2g–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 °C.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.

关 键 词：分级多孔材料 Γ-AL2O3 刚果红 吸附动力学 

分 类 号：O647.3[理学—物理化学] TQ133.1[理学—化学]