Abstract
This work highlights the enhanced photocatalytic activity of porous ZnS microspheres after Au and Pt deposition and heat treatment at 500°C for 2h. Microporous ZnS particles of size 2–5μm with large surface area 173.14m2g−1 and pore volume 0.0212cm3g−1 were prepared by refluxing under an alkaline medium. Photoluminescence of ZnS at 437nm attributed to sulfur or zinc vacancies were quenched to 30% and 49%, respectively, after 1wt% Au and Pt loading. SEM images revealed that each ZnS microparticle consist of several smaller ZnS spheres of size 2.13nm as calculated by Scherrer's equation. The rate of photooxidation of 4-nitrophenol (10μM) under UV (125WHg arc–10.4mW/cm2) irradiation has been significantly improved by Au and Pt deposition followed by sintering due to better electron capturing capacity of deposited metals and growth of crystalline ZnS phase with less surface defects.
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