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TiO2/graphene Oxide Nanocomposite With Enhanced Photocatalytic Capacity For Degradation Of 2,4-dichlorophenoxyacetic Acid Herbicide

T. Natarajan, Praveen Kumar Gopi, K. Natarajan, H. Bajaj, R. Tayade
Published 2021 · Materials Science

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Abstract The present study investigates the photocatalytic degradation of 2,4-Dichlorophenoxyacetic acid (2,4-D), a hazardous herbicide using TiO2/Graphene oxide nanocomposite photocatalysts. The nanocomposite photocatalysts were synthesized via solvothermal method by varying the weight percentage of graphene oxide. The nanocomposite photocatalysts were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer Emmet Teller (BET) adsorption isotherm, Fourier-transform infrared (FT-IR) and UV–visible-diffuse reflectance spectroscopy (UV–Vis-DRS) analysis. The XRD pattern of nanocomposite was found unaltered, whereas a significant change around 33–91% was observed in the surface area of nanocomposites as compared to the pristine TiO2. The UV–Vis DRS study showed a blue shift in the band edge of the composites around 21–29 nm. The complete photocatalytic degradation of 2,4-D was achieved using TiO2/GO7% catalyst within 4 h of reaction under UV-light irradiation. The photocatalytic activity of the synthesized nanocomposite photocatalysts was also compared with the standard Degussa P-25 TiO2 photocatalyst. The order of photocatalytic activity of the synthesized photocatalysts were TiO2/GO7% > P25-TiO2 > TiO2/GO5% > TiO2/GO2% > TiO2/GO1% > TiO2/GO10% > TiO2/GO0.5% > Pristine-TiO2. This study offers a better platform for the synthesis of new composite photocatalytic materials for environment abatement by the degradation of organic pollutants.
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