Self‐Assembled 3D Hierarchically Structured Gamma Alumina by Hydrothermal Method. Issue 1 (28th November 2013)

• Record Type: Journal Article
• Authors: Li, Yanhui; Peng, Cheng; Li, Lianglong; Rao, Pinggen; Naskar, M.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 1(2014)
• Page Start: 35
• Page End: 39
• Publication Date: 2013-11-28
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12652
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12652-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Self‐assembled γ‐Al₂O₃ with hierarchical structure was successfully obtained via thermolysis of γ‐boehmite (γ‐AlOOH) particles, which was hydrothermally derived from aluminum ammonium sulfate hydrate (NH₄Al(SO₄)₂·12H₂O), urea, poly‐glycol (PEG)‐2000, and deionized water. SEM observations indicate that the as‐synthesized γ‐AlOOH has hierarchical flower‐like structure, composing of needle‐like building blocks. After calcinations at 800°C, it converts to cubic γ‐Al₂O₃ with hierarchical structure retained by a topotactical process. N₂ adsorption and desorption reveal that the obtained γ‐Al₂O₃ has a BET surface area of 101 m²/g with a narrow mesoporous size of about 13 nm and a broad macroporous‐size distributions of 200–500 nm, respectively. The as‐generated γ‐Al₂O₃ with hierarchical structure shows good capacities for removing Congo red from wastewater, indicating that 3D hierarchical structure has excellent adsorption ability.</p> </abstract>