Morphology Evolution in Hydrothermal Synthesis of Mesoporous Alumina

doi:10.15541/jim20140104

Abstract

Abstract:

Boehmite with varied morphologies was successfully synthesized from aluminum ammonium sulfate hydrate and urea, as well as poly-glycol-2000 by hydrothermal method. The experimental results show that boehmite microspheres, microfibers and 3D hierarchical structured AlOOH can be fabricated only by adjusting hydrothermal temperature. SEM images indicate that boehmite decomposes into γ-Al₂O₃ phase after heat-treatment through a topotactical process. TEM studies present that the mesopores are formed in γ-Al₂O₃ particles. Based on these investigations, a temperature-dependent morphology formation mechanism is proposed. Besides, the as-synthesized alumina excited at 325 nm shows emission in the range of 380 nm to 500 nm, centered at 409 nm and 467 nm.

Key words: boehmite, &amp, #x003b3, -Al2O3, topotactical, mesoporous, photoluminescence

CLC Number:

TQ174

LI Yan-Hui, PENG Cheng, ZHAO Wei, BAI Ming-Min, RAO Ping-Gen. Morphology Evolution in Hydrothermal Synthesis of Mesoporous Alumina[J]. Journal of Inorganic Materials, 2014, 29(10): 1115-1120.

Figures/Tables 7

Fig. 1 XRD patterns of AlOOH (A), together with their respective (B) wide- and (C) small-angle XRD patterns of γ-Al2O3 powder calcined at 800℃ for 2 h (a) Pre90; (b) Pre120; (c) Pre150

Fig. 2 SEM images of AlOOH (A-B)Pre90;(C-D)Pre120;(E-F)Pre150

Fig. 3 SEM images of γ-Al2O3 obtained from different hydrothermal products calcined at 800℃ for 2 h (A-B) Alu90; (C-D) Alu120; (E-F) Alu150

Fig. 4 TEM image and a typical SAED pattern (inset) of γ-Al2O3 (A-B) Alu90; (C-D) Alu120; (E-F) Alu150

Fig. 5 Barrett-Joyner-Halenda (BJH) pore-size distribution (A-C) and N2 adsorption and desorption isotherm (D-F) of γ-Al2O3 from different hydrothermal products (A, D) Alu90; (B, E) Alu120; (C, F) Alu150

Fig. 6 Schematic diagram of the formation of AlOOH precursor with various morphologies

Fig. 7 Room temperature PL spectra of the as-prepared γ-Al2O3 (a) Alu90; (b) Alu120; (c) Alu150

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