Insight into the Novel Z-Scheme ZIF67/WO3 Heterostructure for Improved Photocatalytic Degradation of Methylene Blue Under Visible Light

In this work, a novel Z-scheme heterojunction of ZIF67/WO3 nanocomposite is successfully prepared via immobilizing WO3 on the MOFs ZIF67 and confirmed by measuring XRD, FT-IR spectroscopy, XPS, SEM, TEM, EDS. UV–vis Mott-Schottky measurements. The photocatalytic activity as-prepared evaluated degrading methylene blue (MB) solution under simulated visible light irradiation. Obviously, optimal ZIF67/WO3-0.3 (designated as 0.3 g addition WO3) delivers significant degradation exceeding 90% toward MB within 120 min, which about 3.0 4.2 times higher than those pure (30.0%) (21.2%). With 0.02 composite, total volume 50 mL at 10 mg/L was thoroughly degraded in min with an apparent rate constant 0.0184 min−1. Reactive species scavenging experiments indicated that holes (h+) hydroxyl radical (·OH) are mainly responsible for degradation. Moreover, probable reaction mechanism elucidated detecting intermediates performing LC–MS excellent performance predominantly determined structural properties composite charge transfer pathway, promote efficient separation photogenerated carriers facilitate electrons to active sites. Therefore, it promising strategy constructing degrade refractory organic dyes.