Abstract
MCM-41 molecular sieve coupled with lead sulfide quantum dots (PbS–MCM-41) was prepared by ion-exchange method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectroscopy, infrared spectroscopy (IR) and BET (Brunauer–Emmett–Teller) experiments. Exciton absorption peak at higher energy than the fundamental absorption edge of bulk lead sulfide indicates quantum confinement effects in quantum dots as a consequence of their small size. The hydrogen production rate from water photocatalytic decomposition under visible light irradiation (λ>400nm) over PbS nanoparticles formed in mesoporous material was much higher compared to the bulk PbS.
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