In this paper, M88/BCB Z-scheme heterojunction photocatalysts were synthesized by a one-step hydrothermal method. A series of characterization analyses showed that the introduction of iron-based MOF material M88 with mixed valence (Fe2+/Fe3+) increased not only the specific surface area of BCB, which was 2.2 times higher than that of BiOCl0.1Br0.9 solid solution, but also the existence of Fe2+/Fe3+ redox centers promoting the in situ photoFenton-like reaction, which could generate more ˙O2− and ˙OH. In addition, the introduction of M88 further enhances the visible light response capability of BCB and the separation efficiency of photogenerated carriers. Under visible light for 120 min, 10% M88/BCB can degrade 89.74% of TC, which is 2.1 times and 1.6 times higher than that of M88 and BCB, respectively. A possible photocatalytic degradation mechanism of Z-scheme heterojunctions was proposed based on the study of the band structure and the capture experiment of active species.
Yanhua Gao,Dongfeng Zhang,Hongya Liu,Ying Chen,Yuning Liang,Mingchun Bi,Juan Ren,Zhihua Wang
Based on the anion exchange strategy, a novel Bi2S3/BiOCl0.1Br0.9 S-scheme heterojunction was prepared via a facile one-step low-temperature water bath method for the first time. In this process, 2D Bi2S3 nanosheets were controllably grown on the surface of a 3D hollow BiOCl0.1Br0.9 solid solution. Under visible light irradiation, the as-prepared 3BS-BCB exhibited a remarkable photocatalytic degradation efficiency of 99.67% toward rhodamine B (Rh B) within 140 min, which is approximately 3.57 times higher than that of the BiOCl0.1Br0.9 solid solution alone. The enhanced photocatalytic performance is attributed to the formation of an interfacial electric field (IEF), which accelerated the separation rate of photoinduced electron–hole pairs and coupled the strong redox ability of both the semiconductors. Moreover, the photosensitive effect of Bi2S3 extended its light absorption range, increasing the yield of photogenerated charge carriers. Such thermodynamic and kinetic compatibility is the fundamental reason for the enhanced photocatalytic efficiency. This study provides new insights into the design of S-scheme heterojunction photocatalysts with visible light response and high redox ability based on wide-band gap semiconductors.
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