A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids
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...
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| Veröffentlicht in: | Catalysts 2020-01, Vol.10 (1), p.34 |
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| creator | M., Rashmi R., Padmanaban Karthikeyan, Vaithinathan Roy, Vellaisamy A. L. Gopalan, Anantha-Iyengar Saianand, Gopalan Kim, Wha-Jung Kannan, Venkatramanan |
| description | 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. |
| doi_str_mv | 10.3390/catal10010034 |
| format | Article |
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L. ; Gopalan, Anantha-Iyengar ; Saianand, Gopalan ; Kim, Wha-Jung ; Kannan, Venkatramanan</creator><creatorcontrib>M., Rashmi ; R., Padmanaban ; Karthikeyan, Vaithinathan ; Roy, Vellaisamy A. L. ; Gopalan, Anantha-Iyengar ; Saianand, Gopalan ; Kim, Wha-Jung ; Kannan, Venkatramanan</creatorcontrib><description>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.</description><identifier>ISSN: 2073-4344</identifier><identifier>EISSN: 2073-4344</identifier><identifier>DOI: 10.3390/catal10010034</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Activation energy ; Alternating current ; Catalysts ; Cerium oxides ; Chemical reactions ; Conductivity ; Copper oxides ; Efficiency ; Electrical resistivity ; Energy gap ; Evaluation ; Heat conductivity ; Heat transfer ; Investigations ; Metal oxides ; Methylene blue ; Nanofluids ; Nanomaterials ; Nanoparticles ; Nanostructured materials ; Photocatalysis ; Photodegradation ; Photon correlation spectroscopy ; Radiation ; Refractivity ; Stability ; Thermal conductivity ; Viscosity ; Zeta potential</subject><ispartof>Catalysts, 2020-01, Vol.10 (1), p.34</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 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L.</creatorcontrib><creatorcontrib>Gopalan, Anantha-Iyengar</creatorcontrib><creatorcontrib>Saianand, Gopalan</creatorcontrib><creatorcontrib>Kim, Wha-Jung</creatorcontrib><creatorcontrib>Kannan, Venkatramanan</creatorcontrib><title>A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids</title><title>Catalysts</title><description>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.</description><subject>Activation energy</subject><subject>Alternating current</subject><subject>Catalysts</subject><subject>Cerium oxides</subject><subject>Chemical reactions</subject><subject>Conductivity</subject><subject>Copper oxides</subject><subject>Efficiency</subject><subject>Electrical resistivity</subject><subject>Energy gap</subject><subject>Evaluation</subject><subject>Heat conductivity</subject><subject>Heat transfer</subject><subject>Investigations</subject><subject>Metal oxides</subject><subject>Methylene blue</subject><subject>Nanofluids</subject><subject>Nanomaterials</subject><subject>Nanoparticles</subject><subject>Nanostructured materials</subject><subject>Photocatalysis</subject><subject>Photodegradation</subject><subject>Photon correlation spectroscopy</subject><subject>Radiation</subject><subject>Refractivity</subject><subject>Stability</subject><subject>Thermal conductivity</subject><subject>Viscosity</subject><subject>Zeta potential</subject><issn>2073-4344</issn><issn>2073-4344</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpVUMtqwzAQFKWFhjTH3gU9u5UtyYqPwaQPCE0O7dnI8ooo2JYryaG59surPA7tsrDDzswOLEL3KXmktCBPSgbZpoTEpuwKTTIiaMIoY9d_8C2aeb8jsYqUzlM-QT8LXNpukE4Gswe83Mt2jND22Gq82R68UVZtoTNKtnjj7AAuGPBY9k2kbbCn3EMwCi-1NspAr458dJfgzNjh9bdp4KQv7RDtl8W77K1uR9P4O3SjZethdplT9Pm8_Chfk9X65a1crBJFBQkJMFFrmBPJNKEFg1oLRWVdN0oDh3ktqSwE5FTkVDVpwzLFZaYpJyA4z2tFp-jhfHdw9msEH6qdHV0fI6uMM5GTqONRlZxVylnvHehqcKaT7lClpDp-uvr3afoLCaB0ew</recordid><startdate>20200101</startdate><enddate>20200101</enddate><creator>M., Rashmi</creator><creator>R., Padmanaban</creator><creator>Karthikeyan, Vaithinathan</creator><creator>Roy, Vellaisamy A. 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L.</au><au>Gopalan, Anantha-Iyengar</au><au>Saianand, Gopalan</au><au>Kim, Wha-Jung</au><au>Kannan, Venkatramanan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids</atitle><jtitle>Catalysts</jtitle><date>2020-01-01</date><risdate>2020</risdate><volume>10</volume><issue>1</issue><spage>34</spage><pages>34-</pages><issn>2073-4344</issn><eissn>2073-4344</eissn><abstract>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.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/catal10010034</doi><orcidid>https://orcid.org/0000-0001-6734-8448</orcidid><orcidid>https://orcid.org/0000-0003-0188-6571</orcidid><orcidid>https://orcid.org/0000-0002-4354-1857</orcidid><orcidid>https://orcid.org/0000-0002-1712-9965</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Activation energy Alternating current Catalysts Cerium oxides Chemical reactions Conductivity Copper oxides Efficiency Electrical resistivity Energy gap Evaluation Heat conductivity Heat transfer Investigations Metal oxides Methylene blue Nanofluids Nanomaterials Nanoparticles Nanostructured materials Photocatalysis Photodegradation Photon correlation spectroscopy Radiation Refractivity Stability Thermal conductivity Viscosity Zeta potential |
| title | A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids |
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