MgAl-layered double hydroxides decorated with Pd-doped SnS nanoparticles: a novel photocatalyst for efficient dye degradation and Cr(VI) reduction in water
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Pd-SnS nanoparticles (NPs) decorated with layered-double-hydroxide (LDH) nanosheets were found to display an enhanced photocatalytic activity toward the degradation of aqueous rhodamine B (RhB, dye) and chromium VI (Cr(VI)), which was superior to that of pure SnS, LDH, and binary composites. The morphological and structural properties of the as-prepared photocatalysts were characterized through various techniques, and their RhB and Cr(VI) degradation activity were evaluated under visible light irradiation. The Pd-SnS/LDH heterojunctions extended the lifetime of the photo-induced electrons and promoted the efficient interfacial transfer of charge carriers. Moreover, the strong interactions between Pd-SnS NPs and LDHs nanosheets further improved the photocatalytic activity. In particular, Pd-SnS/LDH heterojunctions with SnS and Pd contents of 15 and 1 wt%, which showed the highest degradation performance of 99 % within 40 min under illumination, and superior stability during successive experimental progress.