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A novel rGO/AgCl QDs composites have been obtained by an ultrasonic‐assisted method for the first time. Photoelectrocatalytic (PEC) performances of the obtained samples were studied by the degradation of 20 mg/L Tetracycline (TC) under visible light irradiation with an applied bias potential of 1.5 V (vs Ag/AgCl). Degradation of TC by different processes including Photocatalysis (PC), Electrocatalysis (EC), and PEC was compared, and the effect of different bias potential on the PEC degradation of TC was discussed. Results showed that rGO/AgCl QDs composites had displayed superior PEC activity than that of pristine AgCl QDs with degrading 85.2% of TC during 120 minutes, which was about 1.5 times higher than that of AgCl QDs (33%). Besides, compared to PC and EC removal of TC, PEC process showed the highest degradation efficiency of TC (85.2%) by rGO/AgCl QDs, which was about three times and one time higher than that of PC (39.18%) and EC (20.73%) system, respectively. Moreover, the reusibility and stability of the samples were tested by five times cycling tests, and results demonstrated that the stability of bare AgCl QDs was improved after the introduction of rGO. The enhanced PEC activity and stability of the samples could be attributed to the intimate contact between rGO and AgCl QDs and external electric field, which had benefitted the formation of more active sites and accelerated electron‐hole separation.

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/ppsc.202200019. −1 , 4 h) is achieved with 15% CdS/BiOBr, which is nearly double higher than alone BiOBr (435 µmol g cat −1). Comparatively, the CdS/BiOBr microspheres with s-scheme heterostructure exhibit the surprising photocatalytic performance and CH 3 OH selectivity, which are attributed to the enhanced light absorption, as well as effective separation and migration of the photoinduced electron-hole pairs induced by the s-scheme heterojunction between BiOBr and CdS. This study provides a mild hydrolysis-ultrasonic method for environmental remediation and converting energy using cost-effective semiconductor materials. Recently, converting CO 2 into organic fuels, such as formate, [1] CH 3 OH, [2] CH 4 , [3] and HCHO, [4] is considered as a exploitable solution to improve the pollution of the environment purification and energy demanded.Up to now, numerous methods such as photocatalytic reduction, electrocatalytic reduction, biological transformation,