• VINODKUMAR T

      Articles written in Journal of Chemical Sciences

    • Visible light-induced catalytic abatement of 4-nitrophenol and Rhodamine B using ZnO/g-C3N4 catalyst

      ASHOK KUMAR K V VINODKUMAR T SELVARAJ M SURYAKALA D SUBRAHMANYAM CH

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      In this study, pure ZnO and g-C3N4 were synthesized using coprecipitation and simple calcinationmethods, respectively. Further, ZnO is impregnated on a g-C3N4 surface with 10, 20 & 30 weightpercentages, respectively. Besides, these materials are characterized by various physicochemical techniquessuch as PXRD, UV-Vis-DRS, TEM, PL, and FT-IR, etc. Vitally, as-prepared materials, catalytic activity wastested for removal of Rhodamine B and 4-nitrophenol from the wastewater under visible light irradiation.Among all these catalysts, 20 wt% ZnO/g-C3N4 showed better activity and showed 67% and 75% mineralization.

      The graphical abstract simply represents the proposed mechanism for photocatalytic removal of 4-nitrophenol and Rhodamine B with ZnO/g-C3N4 composite. ZnO was a hexagonal plate type structure and g-C3N4 shows a sheet-type structure.

    • Supported nano-sized Ce0.8Eu0.2O2-d solid solution catalysts for diesel soot and benzylamine oxidations

      VINODKUMAR T PRASHANTH KUMAR J K BENJARAM M REDDY

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      The present work describes the role of oxide supports such as alumina (Al2O3), silica (SiO2), andtitania (TiO2) on the structural and catalytic properties of europiumion-doped ceriumoxide. In particular, themainmotive of this study was to further improve the catalytic efficiency of Ce0.8Eu0.2O2-d solid solutions for oxidationreactions.Diesel soot oxidation and oxidative coupling of benzylamine were examined asmodel reactions to assessthe catalytic properties of the prepared materials. These were prepared by deposition coprecipitation method andcharacterized by various techniques namely, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy,transmission electron microscopy, and BET/BJH surface area and pore-size distribution methods. Thecharacterization studies reveal that Ce0.8Eu0.2O2-d is well-dispersed without the formation of CeO2 or Eu2O3 crystalline compounds over the surface of various supports. The TEMstudies confirm the nano-crystalline natureof the Ce0.8Eu0.2O2-d and Raman studies indicate the formation of oxygen vacancies which are significant foroxidation reactions.As expected, the supported Ce0.8Eu0.2O2-d mixed oxides exhibited better catalytic activity thanpure ceria and unsupported oxides towards the soot and benzylamine oxidation reactions.

      Supported Ce0.8Eu0.2O2-d(CE) catalysts are exhibiting better performance than unsupported CE and pure ceria for soot and benzylamine oxidation owing to metal oxide-support and metal oxide-metal oxide interactions.

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