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Synthesis optimization, structural evolution and optical properties of hierarchical nanoporous alumina microspheres prepared by continuous soft chemistry method

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Abstract

In the present work, nanoporous alumina microspheres have been synthesized by sol–gel technique. Acid deficient aluminum nitrate and a mixture of equimolar HMTA-Urea were used as starting materials. The prepared sol then injected as droplets into hot oil column to give spherical shape. After calcinations the samples were characterized by scanning electron microscope, fourier transform infra-red spectroscopy, thermogravimetry–differential thermal analysis, X-ray diffraction and N2 adsorption–desorption isotherms. With respect to the results achieved from the above analyses, it was found that nanoporous alumina microspheres with controllable size and morphology can successfully be produced through sol–gel method.

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Acknowledgments

Islamic Azad University, Gorgan Branch is acknowledged for financial support. The author would like to thank Mr. Ali Hamrang for XRD measurements.

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Authors and Affiliations

  1. Islamic Azad University, Gorgan Branch, Gorgan, Iran

    Davoud Beiknejad

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  1. Davoud Beiknejad
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Correspondence to Davoud Beiknejad.

Electronic supplementary material

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Flowchart for the synthesis of the alumina microspheres (PPT 88 kb)

10934_2013_9689_MOESM2_ESM.pdf

The XRD analysis for ADAN-25 samples with Al/(HMTA-Urea) mole ratios of 1.2 and 1.4 illustrates that the diffraction patterns are essentially identical to each other, indicating that the different Al/(HMTA-Urea) mole ratios employed during the preparation of the precursor do not affect the crystal structure of the final spherical alumina (PDF 178 kb)

10934_2013_9689_MOESM3_ESM.ppt

Energy dispersive spectrum of alumina microspheres (ADAN-25 and Al/(HMTA-Urea) mole ratio of 1.4), calcined at 500 °C, 700 °C, 1100 °C and 1200 °C. EDS analysis indicates that the alumina microspheres are composed of Al and O. The theoretical weight fraction of aluminum in Al2O3 is 52.92 %, which is in good agreement with that obtained from the EDS analysis of the microspheres calcined at 500 °C, 700 °C, 1100 °C and 1200 °C (50.52 %, 52.64 %,49.31 % and 53.07 %, respectively) (PPT 267 kb)

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Beiknejad, D. Synthesis optimization, structural evolution and optical properties of hierarchical nanoporous alumina microspheres prepared by continuous soft chemistry method. J Porous Mater 20, 1075–1086 (2013). https://doi.org/10.1007/s10934-013-9689-z

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