Authors:
Mphilisi M. Mahlambi Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

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Ajay K. Mishra Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

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Shivani B. Mishra Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

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Rui W. Krause Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

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Bhekie B. Mamba Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

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Ashok M. Raichur Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India

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Abstract

Titania (TiO2) nano-photocatalysts, with different phases, prepared using a modified sol–gel process were employed in the degradation of rhodamine at 10 mg L−1 concentration. The degradation efficiency of these nano-photocatalysts was compared to that of commercial Degussa P25 titania. It was found that the nanocatalysts calcined at 450 °C and the Degussa P25 titania had similar photoreactivity profiles. The commercial Degussa P25 nanocatalysts had an overall high apparent rate constant of (Kapp) of 0.023 min−1. The other nanocatalyst had the following rate constants: 0.017, 0.0089, 0.003 and 0.0024 min−1 for 450, 500, 550 and 600 °C calcined catalysts, respectively. This could be attributed to the phase of the titania as the anatase phase is highly photoactive than the other phases. Furthermore, characterisation by differential scanning calorimetry showed the transformation of titania from amorphous to anatase and finally to rutile phase. SEM and TEM characterisations were used to study the surface morphology and internal structure of the nanoparticles. BET results show that as the temperature of calcinations was raised, the surface area reduced marginally. X-ray diffraction was used to confirm the different phases of titania. This study has led to a conclusion that the anatase phase of the titania is the most photoactive nanocatalyst. It also had the highest apparent rate constant of 0.017 min−1, which is similar to that of the commercial titania.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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