• BENJARAM M REDDY

      Articles written in Journal of Chemical Sciences

    • Construction of metal oxide decorated g-C3N3 materials with enhanced photocatalytic performance under visible light irradiation

      T VINODKUMAR P SUBRAMANYAM K V ASHOK KUMAR BENJARAM M REDDY CH SUBRAHMANYAM

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      Herein we report the synthesis and photocatalytic evaluation of heterostructure WO3/g-C3N4 (WMCN) and CeO2/g-C3N4(CMCN) materials for RhB degradation and photoelectrochemical studies. These materials were synthesized by varying the dosages of WO3 and CeO2 on g-C3N4 individually and were characterized with state-of-the-art techniques like XRD, BET surface area, FT-IR, UV–Vis DRS, TGA, SEM, TEM and XPS. A collection of combined structural and morphological studies manifested the formation of bare g-C3N4, WO3, CeO2, WO3/g-C3N4 and CeO2/g-C3N4 materials. From the degradation results, we found that the materialwith 10 wt% WO3 and 15 wt% CeO2 content on g-C3N4 showed the highest visible light activity. The first order rate constant for the photodegradation performance of WMCN10 and CMCN15 is found to be 5.5 and 2.5times, respectively, greater than that of g-C3N4. Photoelectrochemical studies were also carried out on the above materials. Interestingly, the photocurrent density of WMCN10 photoanode achieved 1.45 mA cm − 2 at 1.23 V (vs.) RHE and this is much larger than all the prepared materials. This enhanced photoactivity of WMCN10 is mainly due to the cooperative synergy of WO3 with g-C3N4, which enhanced the visible light absorption and suppresses the electron–hole recombination

    • 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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