Direct Z-Scheme Cs(2)O–Bi(2)O(3)–ZnO Heterostructures as Efficient Sunlight-Driven Photocatalysts

[Image: see text] Limited light absorption, inefficient electron–hole separation, and unsuitable positions of conduction band bottom and/or valence band top are three major critical issues associated with high-efficiency photocatalytic water treatment. An attempt has been carried out here to address these issues through the synthesis of direct Z-scheme Cs(2)O–Bi(2)O(3)–ZnO heterostructures via a facile, fast, and economic method: solution combustions synthesis. The photocatalytic performances are examined by the 4-chlorophenol degradation test under simulated sunlight irradiation. UV–vis diffuse reflectance spectroscopy analysis, electrochemical impedance test, and the observed transient photocurrent responses prove not only the significant role of Cs(2)O in extending light absorption to visible and near-infrared regions but also its involvement in charge carrier separation. Radical-trapping experiments verify the direct Z-scheme approach followed by the charge carriers in heterostructured Cs(2)O–Bi(2)O(3)–ZnO photocatalysts. The Z-scheme charge carrier pathway induced by the presence of Cs(2)O has emerged as the reason behind the efficient charge carrier separation and high photocatalytic activity.