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Ionothermal confined self-organization for hierarchical porous magnesium borate superstructures as highly efficient adsorbents for dye removal.
- Source :
- Journal of Materials Chemistry A; 2014, Vol. 2 Issue 45, p19167-19179, 13p
- Publication Year :
- 2014
-
Abstract
- Three-dimensional (3D) hierarchical porous structures self-organized by one-dimensional (1D) building blocks have attracted considerable attention due to their unique properties and versatile applications. Herein, uniform hierarchical porous MgBO<subscript>2</subscript>(OH) superstructures with a microsphere-like profile were synthesized for the first time via a facile ionothermal synthesis (150 °C, 12.0 h) using MgCl<subscript>2</subscript>, H<subscript>3</subscript>BO<subscript>3</subscript> and NaOH as the raw materials, and N,N-dimethylformamide nitrate ionic liquid as the solvent. The porous MgBO<subscript>2</subscript>(OH) microspheres exhibited a specific surface area of 57.22 m<superscript>2</superscript> g<superscript>−1</superscript>, 82.4% of which had a diameter within the range of 4.0–6.0 μm. The subsequent mild thermal conversion (600 °C, 12.0 h) gave rise to the hierarchical porous Mg<subscript>2</subscript>B<subscript>2</subscript>O<subscript>5</subscript> microspheres with high crystallinity and a specific surface area of 24.20 m<superscript>2</superscript> g<superscript>−1</superscript>. The synergistic effect of the hydrophilic surfaces of the MgBO<subscript>2</subscript>(OH) nanostructures and the ionothermally confined self-organization co-contributed to the formation of the hierarchical porous MgBO<subscript>2</subscript>(OH) and Mg<subscript>2</subscript>B<subscript>2</subscript>O<subscript>5</subscript> superstructures, which were employed as adsorbents for Congo red (CR) in simulated waste water. Both MgBO<subscript>2</subscript>(OH) and Mg<subscript>2</subscript>B<subscript>2</subscript>O<subscript>5</subscript> superstructures exhibited good recyclability and reusability as high efficient adsorbents for dye removal after regeneration. The Langmuir isothermal model well interpreted the adsorption behavior of CR. The intra-particle diffusion model was also well fitted based on the kinetic data, indicating microsphere diffusion as the rate-limiting step. The maximum adsorption capacities, q<subscript>m</subscript>, for CR onto the porous MgBO<subscript>2</subscript>(OH) and Mg<subscript>2</subscript>B<subscript>2</subscript>O<subscript>5</subscript> superstructures, which were calculated from the Langmuir isothermal model, were 228.3 and 139.3 mg g<superscript>−1</superscript>, respectively. The present ionothermally confined self-organization for the hierarchical porous MgBO<subscript>2</subscript>(OH) and Mg<subscript>2</subscript>B<subscript>2</subscript>O<subscript>5</subscript> superstructures provide new insights into the material chemistry, as well as a controllable ionothermal route for hierarchical borate nanoarchitectures. In addition, these superstructures provide a new platform for dye adsorption, and other potential fields, such as heterogeneous catalysis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 2
- Issue :
- 45
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 100392726
- Full Text :
- https://doi.org/10.1039/c4ta03580a