Heilongjiang Provincial Key Laboratory of CO2 Resource Utilization and Energy Catalytic Materials, School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China
In this work, Fe3O4 nanoparticles (NPs) loaded inside and outside halloysite nanotubes (HNTs) were prepared and developed as the heterogeneous Fenton-like catalysts for the removal of representative organic pollutants. Characterization results indicated that the samples with Fe3O4 NPs loaded outside the HNTs lumen (Fe3O4/HNTs) and inside the HNTs lumen (Fe3O4@HNTs) were successfully prepared. Both samples had typical magnetic hysteresis loops, while Fe3O4@HNTs exhibited higher magnetization intensity. The comparative experiments showed that Fe3O4@HNTs had better Fenton-like catalytic ability than that of Fe3O4/HNTs in the degradation of various organic pollutants. Taking Rhodamine B (RhB) as an example, the adsorption thermodynamics and kinetics of RhB onto Fe3O4/HNTs and Fe3O4@HNTs were also investigated. The comparative results demonstrated that the adsorption ability of Fe3O4/HNTs was better than that of Fe3O4@HNTs. Moreover, the dissolved concentration of Fe2+ and production amount of hydroxyl radical (·OH) in the Fe3O4@HNTs-H2O2 system were significantly higher than those in the Fe3O4/HNTs-H2O2 system. Based on aforementioned comparison, the nano-confinement effect in the Fe3O4@HNTs-H2O2 system was verified. This work provides meaningful guidance for the cheap and convenient design of nanoreactors for Fenton-like applications.
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