Key Words:RHB DYE; ORGANIC POLLUTANTS; TIO2; PHOTODEGRADATION; DEGRADATION; HETEROJUNCTION; WATER; DOTS

Abstract:A photocatalyst composed of indium-zinc-sulfide quantum dots modified inverse opal titanium dioxide (ZIS QDsIOT) was synthesized and utilized for the degradation of various organic dyes under sunlight. Electron microscopy images revealed uniform dispersion of ZIS QDs, ranging in size from 2 to 5 nm, on the surface of IOT within an orderly three-dimensional porous structure. Photocatalytic tests demonstrated that the apparent kinetic constants of ZIS QDs-IOT were 19, 8, and 7 times higher than those of bare IOT, ZIS QDs, and commercial P25, respectively, indicating its substantial potential as a non-toxic and stable photocatalyst. Further characterizations indicated a significant enhancement in the production of photoinduced charges, along with a directional electron transfer from IOT to ZIS. Moreover, increased generation of oxidative species resulting from the oxygen reduction process was observed in the composite compared to IOT. Electrochemical analyses and theoretical calculations corroborated the accelerated oxygen reduction process upon the addition of ZIS QDs to IOT. Consequently, a Zscheme route for photoinduced charge transfer was established in the ZIS QDs-IOT composite, leading to prolonged lifetime and reduced recombination rate of photoinduced charges. This synergistic effect preserved the highly oxidative and reductive abilities of both semiconductors, ultimately resulting in remarkable photo- catalytic activity.

Volume:689

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Translation or Not:no