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Lalliansanga,Diwakar Tiwari,Alka Tiwari,Alok Shukla,DONG JIN KIM,Yi-Yong Yoon,Seung-Mok Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
The present communication aims to synthesise the plasmonic nanocomposite Au0(NPs)/TiO2 by afacile route and to utilize material in the efficient removal of Alizarin Yellow in aqueous solutions usingthe UV-A light. Au0-nanoparticles were in situ doped with titania network using template method. Polyethylene glycol was employed asfiller media. The nanocomposites Au0(NPs)/TiO2 (non-template)and Au0(NPs)/TiO2(T) (template) were characterized by the XRD and DRS (Diffuse ReflectionSpectroscopy) methods. Surface characteristics were discussed by the SEM and TEM pictures of thesematerials. The interplanar distance of Au(NPs) were found to be 0.14 nm and 0.20 nm for the materialsAu0(NPs)/TiO2 and Au0(NPs)/TiO2(T), respectively. The Atomic Force Microscopy (AFM) analysis showedheterogeneous surface structure and TiO2 were pillared on the surface. Physico-chemical studiesdeduced the mechanistic pathways of removal. The pseudo-first order rate constant values weredecreased with the increase in dye concentrations. Further, mineralization of Alizarin Yellow wasobtained at wide range of pH (pH 4.0–8.0). The nanocomposite thinfilms showed fairly a good stabilityfor repeated cycle of operations in removal of Alizarin Yellow. The photocatalyst shown greaterapplicability in the real matrix treatment using Tlwang river water.
Alka Tiwari,Alok Shukla,Lalliansanga,Diwakar Tiwari,이승목 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Novel meso-porous nanoparticles Au/TiO2 thin films were obtained by template synthesis using polyethylene glycol as filler medium. The materials were characterized by advanced analytical methods. The photocatalysts were employed for the photocatalytic degradation of tetracycline from aqueous solutions using UV-A light (λmax 330 nm). Various physico-chemical parametric studies enabled to deduce the mechanism of degradation. A significant percentage of tetracycline was mineralized by the treatment. The stability of thin film was evidenced with the repeated use of thin film. The degradation of tetracycline was proceeded predominantly by the OH radicals generated at the valance and conduction band of semiconductor.