Available online 9 September 2022, 112566

Novel CQDs decorated SnO2-x/BiOI hybrid structure was synthesized.

Under LED light CQDs/SnO2-x/BiOI successfully remove MO, TC, E. coli and S. aureus.

In photocatalytic reactions, h+,•O2− and •OH are active species.

SnO2-x/BiOI hybrid promoted the separation and transfer of charges effectively.

CQDs are favorable for the transfer of charge carriers and light absorption ability.

To remove multitudinous pollutants from wastewater, the design of a highly efficient and multifunctional photocatalyst is necessary. A novel CQDs/SnO2-x/BiOI photocatalyst (named CSnBI composite) was prepared by in-situ growth method using quantum dots (CQDs), large specific surface area SnO2-x nanocrystals and BiOI nanocrystals to obtain highly efficient photocatalyst with compact hybrid structure. TEM and Raman techniques have confirmed the structure of CSnBI composite. The photocurrent and EIS show that the photoexcited electron-hole pairs separation efficiency is improved. As anticipated, novel CSnBI photocatalyst can successfully remove tetracycline, methyl orange, E. coli and S. aureus under a LED light due to the hybridization contaction among CQDs, SnO2-x and BiOI. The mechanism showed that the introduction of CQDs promoted better visible light absorption and efficient separation of electrons and holes of SnO2-x/BiOI heterojunction. The capture experiment and related measurements show that h+, •O2− and •OH are active species in the photocatalytic process. This study gave a novel case for facile construction of photocatalysts with dense hybrid structure.

CQDs/SnO2-x/BiOI

LED light

Photocatalyst, degradation

Antibacterial

© 2022 Elsevier B.V. All rights reserved.