Enhanced photocatalytic performance of S-scheme CdMoO_(4)/CdO nanosphere photocatalyst

The photoabsorption capacity,the number of active sites,and the efficiency of carrier separation of photo-catalysts are the main factors that restrict photocatalytic activity.Accordingly,a series of novel CdO-based S-scheme photocatalysts are prepared by a facile one-step precipitation-calcination method for the first time.Although CdO with a narrow band gap has no photocatalytic hydrogen evolution performance,the CdMoO_(4)/CdO composite exhibits excellent photocatalytic activity.The photocatalytic hydrogen evolution(PHE)performance of the optimal ratio(3∶4)is up to 7029 μmol g^(-1) h^(-1) under visible light irradiation.At the same time,the CdMoO_(4)/CdO composite also shows excellent degradation activity of water pollu-tants,and the degradation efficiency for Tetracycline hydrochloride,Oxytetracycline,Norfloxacin,Reactive red 2,and Levofloxacin is 96.33%,95.38%,88.48%,95.93%,and 77.30%under visible light irradiation for 90min,respectively.According to the experimental characterization and theoretical calculation analysis,the introduction of CdMoO_(4) can be used to construct S-scheme heterojunction with CdO,improving the efficiency of charge separation as well as taking full advantage of redox ability,and hence improving su-perior photocatalysts performance.This work affords new insights into efficient PHE and antibiotic/dye degradation of CdO-based S-scheme photocatalysts.