Self-Assembled 3D Hierarchically Structured Gamma Alumina by Hydrothermal Method
Self-Assembled 3D Hierarchically Structured Gamma Alumina by Hydrothermal Method
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DOI：
10.1111/jace.12652
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发表时间：
2014-01-01
影响因子：
3.9
通讯作者：
Rao, Pinggen
中科院分区：
文献类型：
--
作者：
Li, Yanhui;Peng, Cheng;Rao, Pinggen
以水合硫酸铝铵（NH 4Al（SO 4）（2）中心点12 H（2）O）、尿素、聚乙二醇（PEG）-2000和去离子水为原料，通过水热法制备γ-勃姆石（γ-AlOOH）颗粒，经热处理，成功地制备了具有分级结构的γ-Al 2 O3自组装体。SEM观察表明，合成的γ-AlOOH具有分级的花状结构，由针状结构单元组成。在800摄氏度下煅烧后，它转化为立方γ-Al 2 O 3，并通过拓扑过程保留分级结构。N2吸附和脱附表明，γ-Al 2 O3的BET比表面积为101 m2/g，孔径分布为200-500 nm，孔径分布为13 nm。所制备的γ-Al 2 O3具有多级结构，对废水中的刚果红具有良好的吸附性能，表明三维多级结构具有良好的吸附性能。
Self-assembled gamma-Al2O3 with hierarchical structure was successfully obtained via thermolysis of gamma-boehmite (gamma-AlOOH) particles, which was hydrothermally derived from aluminum ammonium sulfate hydrate (NH4Al(SO4)(2)center dot 12H(2)O), urea, poly-glycol (PEG)-2000, and deionized water. SEM observations indicate that the as-synthesized gamma-AlOOH has hierarchical flower-like structure, composing of needle-like building blocks. After calcinations at 800 degrees C, it converts to cubic gamma-Al2O3 with hierarchical structure retained by a topotactical process. N-2 adsorption and desorption reveal that the obtained gamma-Al2O3 has a BET surface area of 101 m(2)/g with a narrow mesoporous size of about 13 nm and a broad macroporous-size distributions of 200-500 nm, respectively. The as-generated gamma-Al2O3 with hierarchical structure shows good capacities for removing Congo red from wastewater, indicating that 3D hierarchical structure has excellent adsorption ability.