A comparative evaluation of physicochemical properties and photocatalytic efficiencies of cerium oxide and copper oxide nanofluids

M., R., R., P., Karthikeyan, V. , Roy, V. A. L. , Gopalan, A.-I., Saianand, G., Kim, W.-J. and Kannan, V. (2020) A comparative evaluation of physicochemical properties and photocatalytic efficiencies of cerium oxide and copper oxide nanofluids. Catalysts, 10(1), 34. (doi: 10.3390/catal10010034)

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Copper oxide (CuO) and cerium oxide (CeO2) of various concentrations have been prepared through an ultrasonically assisted dispersion of CuO and CeO2 nanoparticles (NPs) in which water and nanofluids (NFs) were formulated. The morphological properties of the CuO and CeO2 NPs are reported. Few of the physicochemical properties that can influence the photocatalytic activities of the NFs are evaluated, such as viscosity, activation energy, density, thermal conductivity, electrical conductivity, alternating current (AC) conductivity, pH, stability, refractive index and optical band gap of the CuO and CeO2 NFs. Viscosity studies have been made at four different temperatures (303 K, 308 K, 313 K and 318 K) and the activation energy is calculated and compared between the CuO and CeO2 NFs. The thermal conductivity of the two NFs is calculated and compared. Electrical conductivity is measured for CuO and CeO2 NFs using an impedance analyzer at different frequencies at 303 K. The dielectric constant and AC conductivity were studied. The electrical conductivity and pH of the prepared NFs are measured and the results are compared. The stability of the NFs is determined from Zeta potential values obtained from dynamic light scattering measurements. UV-Visible diffuse reflectance measurements were used to deduce the optical bandgap of the respective metal oxide NPs in the NFs. The photocatalytic efficiencies of the CuO NFs and CeO2 NFs were evaluated using methylene blue (MB) as the model dye. The rate constant for the photodegradation of MB was higher for CuO NF as compared CeO2 NF and also higher than simple NPs-based photocatalysts. A plausible explanation for the role of NFs over the simple NPs-based photocatalytic solution is presented.

Item Type:Articles
Additional Information:This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (No. NRF-2018R1A2B2003832).
Glasgow Author(s) Enlighten ID:Vellaisamy, Professor Roy and Karthikeyan, Dr Vaithinathan
Creator Roles:
Roy, V. A.L.Conceptualization, Methodology, Visualization
Authors: M., R., R., P., Karthikeyan, V., Roy, V. A. L., Gopalan, A.-I., Saianand, G., Kim, W.-J., and Kannan, V.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Catalysts
ISSN (Online):2073-4344
Published Online:26 December 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Catalysts 10(1): 34
Publisher Policy:Reproduced under a Creative Commons License

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