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      저자 : Vadivel Sethumathavan (검색결과 2 건)
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        Revealing the charge transfer mechanism in Er ion‑doped Bi4O5Br2/ g‑C3N5 nanocomposite for efficient photocatalytic degradation of antibiotic tetracycline

        Sethumathavan Vadivel,Lalitha Gnanasekaran,N. Balasubramanian 한국탄소학회 2023 Carbon Letters Vol.33 No.7

        Pharmaceutical products occurring in freshwater bodies create numerous problems for the water bodies owing to their bio-toxic nature. In order to remove such pharmaceutical pollutants, a novel Er-doped Bi4O5Br2/ g-C3N5 nanocomposite was prepared by one-pot synthesis and applied for the photocatalytic removal process. The Er ions doped on the surface of Bi4O5Br2/ g-C3N5 nanocomposite exhibited 97% degradation of tetracycline in 60 min under visible light irradiation, which is higher than pure g-C3N5 and Bi4O5Br2 photocatalysts. The improved photocatalytic properties are attributed to the outstanding visible light harvesting capacity and quick charge carrier separation efficiency which greatly reduced the recombination rate in the heterojunctions. Based on radical trapping experiments, the •O2 ?, h+ and •OH radicals played a prominent role in the photodegradation reactions under visible light. Finally, the ternary Er-doped Bi4O5Br2/ g-C3N5 nanocomposite is effectively recyclable with quite a stable photocatalytic removal rate. This work enables a new perspective on the rational design of rare-earth-based nanocomposites for various pharmaceutical pollutants treatment processes.

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        Effect of Zeta Potential on Chitosan Doped Cerium Oxide in the Decolorization of Cationic Dye under Visible Light Irradiation

        Santhoshini Priya Thomas,Hameed Hussain Ahmed Mansoor,Monicka Kullappan,Vadivel Sethumathavan,Balasubramanian Natesan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7

        In recent days, semiconductor photocatalysis for the advanced water treatment of organic contaminants has beenconsidered as an efficient and attractive technology. This papers deals with the synthesis, characterization, and study of zetapotential effect of chitosan doped cerium oxide beads (CCB) for the photocatalytic decolorization of cationic dye, methyleneblue (MB) under visible light irradiation. The CCB were successfully synthesized through sol-gel method and furthercharacterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electronmicroscopy (SEM). The SEM images show that cerium oxide nanoparticles were profoundly embedded on the chitosanmaterial. CCB exhibited higher photocatalytic activity with 97.75 % after 210 min of decolorization. Decolorization of MBusing CCB was analyzed at different intervals of time under visible light irradiation using UV-Vis spectroscopy. The rate ofMB decolorization under visible light irradiation follows the pseudo first order kinetics using Langmuir-Hinshelwood model. Zeta potential of CCB were analyzed for aqueous solutions of chitosan dispersion over a pH range of 2 to 8.

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