成果归属机构：

能源学院

作者：

Li, Yuanyuan ; Zhang, Fengfan ; Xu, Kunyu ; Yang, Zihao ; Dong, Zhaoxia

单位：

China Univ Petr, Unconvent Petr Res Inst, Beijing 102249, Peoples R China;China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China

关键词：

PHOTO-FENTON; AZO DYES; COMPOSITE PHOTOCATALYSTS; DECOLORIZATION; NANOPARTICLES; PERFORMANCE; CATALYST

摘要：

As an advanced oxidation material, Fe3O4-TiO2 3 O 4-TiO 2 nanocomposites have been widely used in wastewater treatment. However, conventional Fe3O4 3 O 4 nanoparticles suffer from drawbacks such as carrier recombination and aggregation, which seriously affect the catalytic activity. In this study, Fe3O4-TiO2 3 O 4-TiO 2 nanosheets with different TiO2 2 loading rates were synthesized by sol-gel method and solvothermal method. The unique two-dimensional nanostructure of Fe3O4 3 O 4 nanosheets facilitated the deposition of TiO2 2 nanoparticles, resulting in Fe3O4-TiO2 3 O 4-TiO 2 nanosheets with a high BET specific surface area of 121.67 m2 center dot g-1. 2 center dot g-1 . Under optimal experimental conditions, the degradation rate of RhB dye in the photocatalytic synergistic Fenton-like system constructed with Fe3O4-TiO2 3 O 4-TiO 2 nanosheets reached 98.12% within 120 min, significantly surpassing that of single photocatalysis and Fenton- like systems. It was attributed to the unique surface structure of Fe3O4 3 O 4 nanosheets, which provided a larger contact area for TiO2 2 nanoparticles. It facilitated the effective reduction of Fe3+ 3+ to Fe2+ 2+ by photogenerated electrons in TiO2, 2 , inhibited the recombination of photogenerated electron-hole pairs, and consequently enhanced the degradation rate of RhB dye. Furthermore, Fe3O4-TiO2 3 O 4-TiO 2 magnetic nanosheets exhibited excellent reusability and stability, with the recovery rate and degradation rate of RhB dye remaining above 90 % even after five cycles. More importantly, the catalytic mechanism of Fe3O4-TiO2 3 O 4-TiO 2 nanosheets was elucidated, and center dot OH identified as the primary reactive species responsible for degrading RhB dye. This work provides a novel research direction for designing and preparing advanced catalytic degradation materials, offering a practical solution to the challenging issue of wastewater treatment.

基金：

National Natural Science Foun-dation of China [52074320]

语种：

英文

DOI：

10.1016/j.colsurfa.2024.134803

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2024():.

出版日期：

2024-11-05

提交日期：

2024-08-10

引用参考：

Li, Yuanyuan; Zhang, Fengfan; Xu, Kunyu; Yang, Zihao; Dong, Zhaoxia. The synergistic enhancement of photocatalytic activity by Fe3O4-TiO2 3 O 4-TiO 2 nanosheets for rhodamine B degradation[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2024():.