Sol-gel Synthesis of Boron Doped TiO2/hollow Glass Bubbles Composite Powders for Photocatalytic Degradation of Azophloxine

Author(s): Wenjie Zhang*, Yuxuan Liu

Journal Name: Current Nanoscience

Volume 17 , Issue 3 , 2021


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Abstract:

Background: B-TiO2 was supported on the surface of iM16K glass bubbles to achieve a suitable density for the B-TiO2/iM16K composite hollow spheres. Aeration or stirring in the wastewater can lead to thorough mixing of photocatalyst and wastewater. Solid-water separation is relatively easy because the materials can float on the water surface while stopping aeration or stirring.

Methods: The iM16K glass bubbles were used to prepare boron-doped B-TiO2/iM16K composite hollow spheres through a sol-gel route. The materials were characterized by X-ray diffraction, scanning electron microscope, Fourier transforms infrared spectroscopy, UV-Visible diffuse reflectance spectrometry, and N2 adsorption-desorption techniques. The photocatalytic degradation of azophloxine on the composites was determined.

Results: The bandgap energy of the B-TiO2/iM16K composite was slightly less than 3.0 eV when the calcination temperature was below 500°C. The sample calcined at 350°C had a BET surface area of 88.6 m2/g, while the value of the sample calcined at 800°C was 1.2 m2/g. The maximum photocatalytic degradation efficiency was obtained for the sample calcined at 450°C, and nearly all of the original azophloxine molecules were decomposed after 120 min of irradiation. Photocatalytic degradation efficiency after 30 min of irradiation was enhanced from 18.8% to 47.9% when the B-TiO2 dosage increased from 100 to 800 mg/L.

Conclusion: Crystallization of anatase TiO2 was temperature-dependent, and the properties of BTiO2/ iM16K composite hollow spheres were affected by the phase composition of the boron-doped TiO2 layer. The change in calcination temperature can have a significant effect on the photocatalytic degradation of azophloxine. The production of hydroxyl radical depended on the photocatalytic activity of the B-TiO2/iM16K composite hollow spheres.

Keywords: Photocatalytic, hollow sphere, TiO2, calcination, azophloxine, composite.

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Article Details

VOLUME: 17
ISSUE: 3
Year: 2021
Published on: 15 June, 2021
Page: [475 - 483]
Pages: 9
DOI: 10.2174/1573413716999200819200603
Price: $65

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