3D Hierarchical Flower Like Alumina Nanomaterials: Preparation and Arsenic Removal Performance

doi:10.15541/jim20180317

Abstract

Abstract:

A 3D flower-like active alumina material was synthesized through a simple hydrothermal method following by calcination at 500 ℃. This structure retains abundant nanoscale active sites and micro-scale 3D size. In the column adsorption test, when the arsenic-contaminated water flows through the material, this 3D hierarchical structure not only serves as a skeleton support, but also provides adsorption site with larger specific surface area so that the arsenate ion can be fully adsorbed. The synthesized alumina in this study performs better arsenic removal than the commercial one without secondary pollution in the water body. The arsenic removal kinetic tests clarify the application conditions of the pseudo first- and second-order adsorption kinetic models. Zeta potential and ionic strength reveal that the mechanism of adsorption of As (V) on γ-Al₂O₃ follows the inner spherical model, while the adsorption of As (III) follows the outer spherical model.

Key words: 3D hierarchical Al₂O₃, crystal growth, adsorption kinetics, adsorption mechanism

CLC Number:

TQ174

Rong-Hui LI, Yi-Zheng JIA, Nan-Nan HU. 3D Hierarchical Flower Like Alumina Nanomaterials: Preparation and Arsenic Removal Performance[J]. Journal of Inorganic Materials, 2019, 34(5): 553-559.

Figures/Tables 10

Fig. 1 Schematic diagram of the column test device for arsenic removal

Fig. 2 XRD patterns of sample A (a) and sample B (b)

Fig. 3 SEM images of sample B (γ-Al2O3) calcined from the sample hydrothermal treated for 5 h (a, c) and 12 h (b, d) with the magnification (c,d) of (a) and (b), respectively

Fig. 4 Scheme for the formation of flower-like alumina

Fig. 5 (a) N2 adsorption desoption curve and schematic diagram of H3 hysteresis loop (inset), and (b) pore size distribution curve

Fig. 6 Correlation coefficient (R2) of pseudo 1st and 2nd kinetics models on As(V) with different dosages of adsorbent

Fig. 7 Column test of arsenic removal for (a) as-synthesized Al2O3 and (b) commercial activated Al2O3

Fig. 8 Effects of competing ions on the adsorption of As(III) and As(V) onto γ-Al2O3

Fig. 9 Zeta potential changes after As(III) (a) and As(V) (b) adsorption

Fig. 10 Effects of ionic strength on the As(III) (a) and As(V) (b) adsorption capacity at different pH

References 12

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