Add time:08/28/2019         Source:sciencedirect.com

Ag core–TiO2 shell ([email protected]2) structured nanoparticles with Ag to TiO2 molar ratio of 1:1.7 were synthesized using one pot synthesis method and post calcination was carried out at 450 °C for 3 h to convert it from amorphous to crystalline form. The Ag core and TiO2 shell formation was confirmed by TEM and AFM. The particle size analysis revealed the average size of [email protected]2 as approximately around 30 nm. EDS spectra showed the presence of O, Ag, and Ti elements. The improvement in optical properties was proved by DRS which showed significant red shift by Ag core in visible region. [email protected]2 exhibited better photocatalytic activity as compared to Degussa P25-TiO2, synthesized TiO2, and the Ag doped TiO2 photocatalysts under UV and solar light irradiation for degradation of Reactive BLUE 220 (cas 114090-18-5) (RB-220) dye. Higher rate of photocatalysis of RB-220 with [email protected]2 was obtained under solar light irradiation as compared to UV light irradiation, confirming the capability of the catalyst to absorb both UV and visible light. The kinetics of degradation of dye was found to follow modified Langmuir Hinshelwood (L–H) kinetic model. [email protected]2 can be recycled without much decline in the efficacy. [email protected]2 has been found to be the effective photocatalyst for degradation of water contaminated with azo dyes under both UV and solar light irradiations.

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