Mesoporous Alumina Microfibers In Situ Transformation from AACH Fibers and the Adsorption Performance

Xiaoqin Shi,Dayu Tang,Chen Yang,Chong Cui,Liang Zhang,Haibo Zeng,Yun Zhu,Zhongding Lu

doi:10.1155/2014/381235

Xiaoqin Shi, Dayu Tang + Show 6 more

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https://doi.org/10.1155/2014/381235

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Abstract

Well-dispersed mesoporousγ-alumina microfibers with high surface were prepared by thermal decomposition of the ammonium aluminum carbonate hydroxide (AACH) precursors. The as-synthesized alumina retained the morphology of its precursor and exhibited memory effect. The structural, morphological, porous, and adsorptive properties of the samples were investigated by XRD, FTIR, TGA-DSC, SEM, TEM, and UV-vis spectroscopy. The preparedγ-alumina microfibers exhibited excellent ability to remove organic pollutants from waste water because of their mesoporous structures. Theγ-alumina in situ converted from AACH synthesized without surfactant exhibited adsorption ability for Congo red as good as that synthesized with PEG2000 and better than PEG20000 that provided a facile method without surfactant to synthesizeγ-alumina with excellent adsorption performance.

Highlights

In recent years, considerable attention has been paid to the environmental pollution problems
A great deal of recent effort has been placed on the synthesis of mesoporous alumina with a high specific surface area and large pore volume using various templates, including surfactants, [7,8,9,10] carboxylic acids, [11] and single organic molecules
The UV-vis spectra of Congo red solutions in the presence of γ-Al2O3 transformed from ammonium aluminum carbonate hydroxide (AACH) prepared with surfactant of PEG2000 were taken over time at room temperature (Figure 6(A))

Summary

Introduction

Considerable attention has been paid to the environmental pollution problems. Alumina have been prepared in different morphologies including nanowhiskers [2], nanoflakes [3], nanowires [4], nanofibers [5], nanorods, and nanotubes [6]. They may be categorized as one- and twodimensional nanostructures. The possible formation process and subsequently surfactant-induced growth mechanism is proposed. Both of the as-obtained alumina fibers were used to adsorb Congo red from water solution

Experimental

Results and Discussions

Conclusions