摘要
利用溶剂热法制备复合型MOF-808/MIL-101(Fe)光催化剂。使用罗丹明B(RhB)作为目标污染物,通过调节不同MOF-808的负载量探究MOF-808/MIL-101(Fe)复合材料光催化性能与负载量之间关系。结果表明,在MOF-808质量分数为7%时,在可见光下其对RhB的光催化降解率可达95%以上,再生循环5个周期,光催化剂的去除率仍然维持90%以上,良好的循环稳定性源于复合材料的构建能有效地抑制电子和空穴的复合。通过XRD、FT-IR、UV-vis和TGA等一系列表征手段对复合物的物相组成、热稳定性、光生电荷分离率和光学性质等进行分析,复合材料的构建相较于单一类型的光催化剂有效地提高了光生电子的分离效率,在降解有机染料RhB方面表现出优异的性能。通过自由基捕获实验研究催化过程中可能存在的活性物种,实验表明超氧自由基和空穴是主要的活性物种,基于以上实验和表征提出了可能的光催化机理。
The metal-organic framework MOF-808/MIL-101(Fe)was prepared by solvothermal method.Rhoda⁃mine B(RhB)was used as the target pollutant to investigate the photocatalytic performance of MOF-808/MIL-101(Fe)composite.The results showed that when the mass fraction of MOF-808 was 7%,the performance of photocata⁃lytic degradation of pollutants reached more than 95%under visible light.And the removal efficiency of the photo⁃catalyst remained above 90%after 5 cycles of regeneration.In addition,through a series of characterizations such as XRD,FT-IR,UV-vis and TGA,the phase composition,thermal stability,photogenerated charge separation rate and optical properties of the composites were characterized and analyzed.Compared with a single type of photocatalyst,the composite material could effectively improve the separation efficiency of photogenerated electrons and showed excellent performance in the degradation of organic dye RhB.Radical trapping experiments showed that superoxide radicals and holes were the main active species,and a possible photocatalytic mechanism was proposed based on the above experiments and characterizations.
作者
杨赟
周媛媛
胡豪
杨水金
YANG Yun;ZHOU Yuanyuan;HU Hao;YANG Shuijin(College of Chemistry and Environmental Engineering,Hanjiang Normal University,Shiyan 442000,China;College of Chemistry and Chemical Engineering,Hubei Normal University,Huangshi 435002,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2023年第8期97-103,共7页
Industrial Water Treatment
基金
湖北省教育厅科学研究计划重点科研项目(D20213102)
汉江师范学院科学研究计划项目(XJ2021501)。
