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- Title
Synthesis, characterization, and photocatalytic activity of silver and zinc co-doped TiO2 nanoparticle for photodegradation of methyl orange dye in aqueous solution.
- Authors
Oladipo, Gabriel O.; Akinlabi, Akinola K.; Alayande, Samson O.; Msagati, Titus A.M.; Nyoni, Hlengilizwe H.; Ogunyinka, Opeyemi O.
- Abstract
In this study, TiO2 nanocrystals, 1 mol% Ag-doped TiO2, and 1 mol% Ag and 0.6 mol% Zn co-doped TiO2 powders were synthesized by the sol–gel route. Their photocatalytic activities on methyl orange dye under visible irradiation were investigated. The powders were characterized by X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis), Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectroscopy (FTIR). The XRD results revealed the presence of a rutile phase with an average crystallite size of 9 and 11 nm. The UV–vis spectra showed a red-shift towards a longer wavelength with the corresponding decrease in band gap from 2.9 to 2.5 eV. The BET surface areas of the nanoparticles ranged from 4.7 to 11.8 m2 g−1 with an average pore size between 18.9 and 56.6 nm. The Ag-doped TiO2 has the largest surface area of 11.8 m2 g−1, whereas the Ag–Zn co-doped TiO2 was found to have the highest pore size and volume. The absorption bands at 750–500 cm−1 were attributed to the –O–Ti–O– bond in the TiO2 lattice. The photocatalytic efficiency was highest at an optimum pH of 4.1 for Ag–Zn co-doped TiO2. The results confirmed that Ag-doped and Ag–Zn co-doped TiO2 were more effective than pure TiO2. The kinetic data were fitted into a pseudo first-order equation using a Langmuir–Hinshelwood kinetic model.
- Subjects
PHOTODEGRADATION; ZINC catalysts; FOURIER transform infrared spectroscopy; AQUEOUS solutions; ZINC compounds synthesis; ULTRAVIOLET-visible spectroscopy; SILVER
- Publication
Canadian Journal of Chemistry, 2019, Vol 97, Issue 9, p642
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/cjc-2018-0308