摘要
采用水热法制备硫化铋(Bi_(2)S_(3))和活性纳米碳纤维掺杂硫化铋复合材料(Bi_(2)S_(3)/CNFs),以降解水溶液中甲硝唑(MTZ)抗生素。通过XRD、SEM、TEM、FTIR、XPS、UV-Vis和PL等对样品的晶型、形貌、结构、元素组成、表面官能团、光学性质进行了表征。结果表明,活性纳米碳纤维(CNFs)引入Bi_(2)S_(3)中,可降低光生电子-空穴对的复合速率,提高其光催化活性。在可见光照射下,考察了Bi_(2)S_(3)/CNFs复合材料光催化降解MTZ的活性,发现CNFs掺量为47%(以Bi_(2)S_(3)质量计,下同)、MTZ质量浓度为10 mg/L,复合材料用量为60 mg时,Bi_(2)S_(3)/CNFs复合材料光催化性能优异,在3 h内,MTZ的降解率为92%。Bi_(2)S_(3)/CNFs复合材料在3次循环后也表现出良好的稳定性和可回收性。活性基团捕获实验表明,羟基自由基(·OH)、光生空穴(h^(+))和超氧自由基(·O_(2)^(–))参与了Bi_(2)S_(3)/CNFs对MTZ的降解,而·OH和h^(+)是该体系的主要活性组分,并在此基础上初步探讨了光催化反应机理。
Bismuth sulfide(Bi_(2)S_(3)) and activated carbon nanofiber doped bismuth sulfide(Bi_(2)S_(3)/CNFs) composite materials were prepared by the hydrothermal method and used to remove metronidazole(MTZ) from the aqueous solution. The crystal form, morphology, structure, elemental composition, surface functional groups and optical properties of the samples were characterized by XRD, SEM, TEM,FTIR,XPS, UV-Vis and PL. The results showed that the introduction of active carbon nanofibers(CNFs) into Bi_(2)S_(3) could reduce the recombination rate of photogenerated electron-hole pairs and improve their photocatalytic activity. The photocatalytic degradation of MTZ by Bi_(2)S_(3)/CNFs composite materials was evaluated under visible light irradiation. It was found that the photocatalytic activity of Bi_(2)S_(3)/CNFs composite material was excellent and the removal rate of MTZ was 92% within 3 h When the content of CNFs was 47%(based on the mass of Bi_(2)S_(3), the same below), the mass concentration of MTZ was 10 mg/L, and the amount of composite material was 60 mg. This Bi_(2)S_(3)/CNFs composite material also showed good stability and recoverability after three cycles. The active group capture experiments showed that hydroxyl radical(·OH), photogenerated hole(h^(+)) and superoxide radical(·O_(2)^(–)) were involved in the degradation of MTZ on Bi_(2)S_(3)/CNFs, and ·OH and h^(+) were the main active components of the system. The photocatalytic reaction mechanism was discussed.
作者
汪鸣凤
申久英
彭蕾
刘润雨
刘心中
席北斗
WANG Mingfeng;SHEN Jiuying;PENG Lei;LIU Runyu;LIU Xinzhong;XI Beidou(School of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou 350000,Fujian,China;Aolan(Fujian)Industrial Co.,Ltd.,Fuzhou 350000,Fujian,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第9期1840-1847,共8页
Fine Chemicals
基金
国家重点研发计划课题(2019YFC1904103)。