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- Title
Efficient treatment of organic pollutants by boron doped TiO2 photocatalysts under visible light radiation.
- Authors
Arifin, Md. Noor; Tarek, Mostafa; Rahman Khan, Md. Maksudur
- Abstract
[Display omitted] • Boron doped TiO 2 for photocatalytic remediation of methylene blue. • Advantage of interstitial position of boron within TiO 2 for photocatalytic degradation. • High efficiency of boron-TiO 2 in mineralization of methylene blue. • More than 93% degradation before 240 min. As one of the most widely used photocatalysts, TiO 2 suffers from the limited application with respect to harvesting solar energy for the environmental remediation. One way to perform the TiO 2 modification is by doping, through which the doped TiO 2 would be able to absorb the visible light from the solar illumination as a visible reactive catalyst. The objective of this work is to synthesize boron-doped TiO 2 (B@TiO 2) photocatalysts using a method called sol–gel. The as-synthesized catalysts were characterized using DR UV–vis spectroscopy, XRD, photoluminescence, XPS, SEM, EDS and TEM. The XRD results show that doping of boron constituent could hinder the grain crystallite growth and selectively favor the anatase phase formation and diboron trioxide phase, B 2 O 3. The characterization works indicated an enhanced absorption edge of B@TiO 2 and reduced band gap energy to enable the visible light photocatalytic activity. The lowest intensity of PL result signaled the slowest recombination rate of electron by supposedly newly created energy level by the doped boron, was achieved by 6B@TiO 2. The 6B@TiO 2 demonstrated the most efficient performance with greater than 93% of MB degradation, owing to the aforementioned modification of the optical and electronic properties during the optimization effort of catalyst synthesis. In this work, a less energy intensive sol–gel procedure was carried out to produce the equally efficient photocatalysts. As a conclusion, the doping mechanism has extended the absorption spectrum of TiO 2 and successfully degraded the model dye within the controlled experimental conditions.
- Subjects
VISIBLE spectra; POLLUTANTS; PHOTOCATALYSTS; TITANIUM dioxide; BORON; MICROPOLLUTANTS
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2022, Vol 180, p212
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2022.02.016