Enhanced degradation of rhodamine B under visible light by BiOCl@COF-1n-n type heterojunction photocatalysts

Abstract

A novel n-n type heterojunction BiOCl@COF-1 was synthesized by a facile one-step solvothermal method and used for the degradation of rhodamine B(RhB) in water. The structure, morphology, composition, optical and electrochemical properties of the prepared composites were characterized through various techniques. Compared with the pure BiOCl, the BiOCl@COF-1 composite demonstrated significantly enhanced efficiency and durability for degradation of RhB under visible light. The observed enhancement in photocatalytic activity can be attributed to the synergistic effect of the n-n type heterojunction, which notably improve the visible light absorption efficiency, and the efficient charge separation. Additionally, the possible photodegradation mechanism of RhB was explores based on the characterization results. This work not only offers a promising strategy for the purification of organic wastewater, but also provides an effective approach for the construction of other COF-based n-n type heterojunction.