Photocatalytic activity of binary metal oxide nanocomposites of CeO2/CdO nanospheres: Investigation of optical and antimicrobial activity

Magdalane, C. Maria; Kaviyarasu, K.; Vijaya, J. Judith; Siddhardha, Busi; Jeyaraj, B.

doi:10.1016/j.jphotobiol.2016.08.013

Cited by 200 publications

(50 citation statements)

References 49 publications

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“…S4a †) the respective mass losses as 8.25% (ZSM-5-RHA), 7.70% (ZSM-5-RHuA), and 6.95% (ZSM-5-RSA) up to 200 C, which were ascribed to the removal of water from the zeolite molecules, 47 and the next signicant mass losses at 250-550 C were due to the elimination of inner water molecules or a solid-to-solid phase transition in the ZSM-5 pores. 48 The weight losses occurring at high temperatures of 550-700 C can be attributed to the blazing of impurities, loss of humidity, and elimination of inner water molecules in the zeolite framework. The complete mass loss of the ZSM-5-RHA catalyst is superior to that of ZSM-5-RHuA and ZSM-5-RSA catalysts.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

Jesudoss¹,

Vijaya²,

Kaviyarasu

et al. 2018

RSC Adv.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

Jesudoss¹,

Vijaya²,

Kaviyarasu

et al. 2018

RSC Adv.

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“…The percentage decomposition of the RhB pink absorption peak (578.21 nm) after 1 and 2 hrs was 93%. These results highlight the superior photocatalytic response of ceria-doped TiO 2 nanocomposites6869707172. The decrease in intensity of the absorption peaks, both in the visible and ultraviolet regions, with irradiation time indicated that the RhB was degraded.…”

Section: Resultsmentioning

confidence: 72%

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

Kaviyarasu

Kennedy

Manikandan

et al. 2016

Sci Rep

367

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To photo-catalytically degrade RhB dye using solar irradiation, CeO 2 doped TiO 2 nanocomposites were synthesized hydrothermally at 700 °C for 9 hrs. All emission spectra showed a prominent band centered at 442 nm that was attributed to oxygen related defects in the CeO 2 -TiO 2 nanocrystals. Two sharp absorption bands at 1418 cm −1 and 3323 cm −1 were attributed to the deformation and stretching vibration, and bending vibration of the OH group of water physisorbed to TiO 2 , respectively. The photocatalytic activities of Ce-TiO 2 nanocrystals were investigated through the degradation of RhB under UV and UV+ visible light over a period of 8 hrs. After 8 hrs, the most intense absorption peak at 579 nm disappeared under the highest photocatalytic activity and 99.89% of RhB degraded under solar irradiation. Visible light-activated TiO 2 could be prepared from metal-ion incorporation, reduction of TiO 2 , non-metal doping or sensitizing of TiO 2 using dyes. Studying the antibacterial activity of Ce-TiO 2 nanocrystals against E. coli revealed significant activity when 10 μg was used, suggesting that it can be used as an antibacterial agent. Its effectiveness is likely related to its strong oxidation activity and superhydrophilicity. This study also discusses the mechanism of heterogeneous photocatalysis in the presence of TiO 2 . Solar energy is uniquely poised to solve major energy and environmental challenges that are being faced by humankind. As such, it is important to develop a suitable environmentally-friendly technology that permits the full range of the solar spectrum to be used for simultaneously solving energy and environmental challenges. It has been proposed that it is possible to address these challenges using nanocomposite materials that are capable of solar photocatalytic conversion 1,2 . Nanocomposite materials have a mixture of different chemical compositions and have received wide interest from fundamental and applied science researchers. The physical properties of these materials can be combined to produce materials that have desirable characteristics. Optical or biological characteristics can change with decreasing particle sizes, which is a major reason for interest in nanocomposite materials 3 . For example, metal oxide nanocomposites have excellent physical properties, such as high hardness and melting points, low densities and coefficients of thermal expansion, high thermal conductivities, good chemical stabilities. They also have improved mechanical properties, such as higher specific strengths, better wear resistance and specific modulus, and have wide potential for various industrial fields 4,5 .

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“…This band might be associated with stretching vibration of OH groups contained in Ca(OH) 2 , which can be formed by decomposition of nitrate followed by its reaction with water [38]. It was noted that the bands related to vibrational model of Ce group did not appear in the testing range of 400 cm -1 -4000 cm -1 possibly due to (1) Ce-O groups may appear at about wavenumbers lower than 400 cm −1 [41]; (2) The frequency of Ce-O might be reduced by the formation of mixed binary metal oxide [42].…”

Section: Ft-ir Absorption Spectra Analysismentioning

confidence: 99%

The utilization of hydroxyapatite-supported CaO-CeO2 catalyst for biodiesel production

Yan

Zhang

Chen

et al. 2016

Energy Conversion and Management

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The study investigated the effect of a bimetallic supported catalyst in biodiesel production. Calcined waste bone derived hydroxyapatite (HAP), a solid waste from animal, was served as the support for CaO-CeO 2 catalyst. Various characterization techniques such as FT-IR, BET, SEM-EDS, CO 2-TPD and XRD analysis were used to analyse the activity of this heterogeneous catalyst. The effect of main parameters in preparation process such as calcination temperature and active component loading on catalyst performance were discussed to obtain the optimal preparation conditions. Under the optimal reaction conditions (11 wt.% dosage of 30%CaO-CeO 2 /HAP-650 catalyst and 9:1 methanol to oil molar ratio at 65 °C for 3 h) the highest biodiesel yield of 91.84% was obtained. Stability test indicated that the yield (84.4%) of fatty acid methyl ester was produced after 8 re-used cycles due to the low leaching of catalyst components.

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Photocatalytic activity of binary metal oxide nanocomposites of CeO2/CdO nanospheres: Investigation of optical and antimicrobial activity

Cited by 200 publications

References 49 publications

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

Photodegradation of organic pollutants RhB dye using UV simulated sunlight on ceria based TiO2 nanomaterials for antibacterial applications

The utilization of hydroxyapatite-supported CaO-CeO2 catalyst for biodiesel production

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