All-solid-state Z-scheme WO nanorod/ZnInS composite photocatalysts for the effective degradation of nitenpyram under visible light irradiation.

A Z-scheme WO/ZnInS photocatalyst was synthesized via a simple solvothermal method. Compared with pure WO and ZnInS, photocatalytic experiments showed that these Z-scheme photocatalysts exhibited enhanced activity for the degradation of nitenpyram (NTP). The apparent rate constant (k) of NTP degradation on 50WZ (WO/ 50 wt% ZnlnS) was 0.042 min (∼3.8 times higher than WO and ∼2.5 times higher than ZnInS). Photoluminescence (PL), photocurrent (PC), and electrochemical impedance spectroscopy (EIS) showed that the separation and transfer efficiency of photogenerated carriers in 50WZ was markedly enhanced, which was favorable for improving its photocatalytic activity. Active species capture experiments and electron spin resonance (ESR) measurements showed that superoxide radicals and holes were the main active species for NTP degradation, and they confirmed the formation of the Z-scheme structure. Furthermore, a possible NTP degradation pathway was deduced based on the results of high-performance liquid chromatography mass spectrometry (HPLC-MS).