2D/2D BiOBr/g-C3N4 S型异质结光催化性能

近年来,能源短缺和环境污染严重威胁人类的可持续发展.光催化技术具有绿色环保、成本低等优势,被认为是解决上述问题的最佳途径之一,其实用化的核心是开发高效可见光催化材料.石墨相氮化碳(g-C3N4)因其物理化学性质稳定、无毒、廉价及能带适宜等特点,广泛应用于光催化领域.然而,光生载流子易复合、比表面积小等问题不利于其实际应...

Novel S-scheme 2D/2D BiOBr/g-C3N4 heterojunctions with enhanced photocatalytic activity

The design and construction of heterojunction photocatalysts, which possess a staggered energy band structure and appropriate interfacial contact, is an effective way to achieve outstanding pho-tocatalytic performance. In this study, 2D/2D BiOBr/g-C3N4 heterojunctions were successfully ob-tained by a convenient in situ self-assembly route. Under simulated sunlight irradiation, 99％ of RhB (10 mg·L–1, 100 mL) was efficiently degraded by 1.5-BiOBr/g-C3N4 within 30 min, which is better than the performance of both BiOBr and g-C3N4, and it has superior stability. In addition, the com-posite also exhibits enhanced photocatalytic activity for H2 production. The enhanced activity can be attributed to the intimate interface contact, the larger surface area, and the highly efficient separa-tion of photoinduced electron–hole pairs. Based on the experimental results, a novel S-scheme model was proposed to illuminate the transfer process of charge carriers. This study presents a simple way to develop novel step-scheme photocatalysts for environmental and related applica-tions.