Liu Xin, Cheng Xianxiong, Lian Junfeng, Tang Jiahua, Wang Rui
Research Center for Water Quality Security Technology at Ganjiang River Basin, Jiangxi University of Science and Technology, Ganzhou 341000, China.
Research Center for Water Quality Security Technology at Ganjiang River Basin, Jiangxi University of Science and Technology, Ganzhou 341000, China E-mail:
Water Sci Technol. 2025 Feb;91(4):363-381. doi: 10.2166/wst.2025.010. Epub 2025 Feb 4.
Metal-organic frameworks (MOFs) have garnered significant interest in the field of photocatalysis. In this study, Z-scheme heterojunction BM-x composites consisting of bismuth bromide oxide (BiOBr) and iron-based metal-organic backbone (MIL-100(Fe)) were successfully synthesized using ethylene glycol as a solvent. The composites were characterized using various techniques. BM-x exhibit abundant functional groups, large specific surface areas, and narrow band gap energy, thus provide numerous active sites for catalytic reactions and respond well to visible light. Notably, BM-7 displays remarkable catalytic activity in a visible light-activated permonosulfate (PMS) system and achieves a degradation rate of 99.02% over 100 mg/L gold orange II (AO7) within 60 min. The effects of BM-7 and PMS addition, initial AO7 concentration, initial pH, inorganic anions, and humic acid on the degradation system were investigated. The proposed mechanism of the Z-scheme heterojunction in the BM-7 photocatalyst demonstrates effective photoelectron transfer from the BiOBr conduction band to the MIL-100(Fe) valence band, resulting in excellent catalytic activity. Radical burst experiments identified O, h, and ·O as the main active substances. BM-7 has high stability and reusability, with a degradation rate reduction of only 14.48% after three recycles. These findings provide valuable insights into using persulfate combined with visible light.
金属有机框架材料（MOFs）在光催化领域引起了广泛关注。在本研究中，以乙二醇为溶剂成功合成了由溴氧化铋（BiOBr）和铁基金属有机骨架（MIL-100(Fe)）组成的Z型异质结BM-x复合材料。采用多种技术对复合材料进行了表征。BM-x具有丰富的官能团、较大的比表面积和较窄的带隙能量，从而为催化反应提供了大量活性位点，并对可见光有良好响应。值得注意的是，BM-7在可见光活化的过一硫酸盐（PMS）体系中表现出显著的催化活性，在60分钟内对100 mg/L的金橙II（AO7）降解率达到99.02%。研究了BM-7和PMS添加量、初始AO7浓度、初始pH值、无机阴离子和腐殖酸对降解体系的影响。BM-7光催化剂中Z型异质结的 proposed mechanism表明光电子从BiOBr导带有效转移到MIL-100(Fe)价带，从而产生优异的催化活性。自由基猝灭实验确定O、h和·O为主要活性物质。BM-7具有高稳定性和可重复使用性，三次循环后降解率仅降低14.48%。这些发现为过硫酸盐与可见光联合使用提供了有价值的见解。
