首页|In situ conversion of typical type-I MIL-125(Ti)/BiOBr into type-II heterostructure photocatalyst via MOF self-sacrifice: Photocatalytic mechanism and theoretical study
In situ conversion of typical type-I MIL-125(Ti)/BiOBr into type-II heterostructure photocatalyst via MOF self-sacrifice: Photocatalytic mechanism and theoretical study
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NSTL
Elsevier
The type-I MIL-125(Ti)@BiOBr heterojunction was prepared by a foolproof wet chemical strategy. Since the self-doping of Ti3+ was introduced at the sacrifice of MOF, the type-I heterojunction was transformed into the type-II TiO2@BiOBr core-shell hollow heterojunction in situ. The self-doping of Ti3+ and the contact of the heterogeneous interface synergistically promote the photocatalytic activity of TiO2@BiOBr. The optimized Ti@BOB-3(mMIL-125(Ti): mBiOBr = 2:5) has a higher degradation rate (91%) for ciprofloxacin, and the first-order rate constant (0.02225 min?1) is pure 13.09 times of MIL-125(Ti) (0.0017 min?1) and 6.58 times of pure BiOBr (0.00338 min?1). UV-Vis diffuse reflection and photodegradation of antibiotics experiments show that type-II TiO2@BiOBr heterojunction has a broader range of light responses and better photocatalytic performance. The DFT calculation further studied the type-II heterojunction's energy band structure and forbidden band width (1.94 eV). Active species capture experiment and EPR spectrum analysis confirmed that h+ and ?O2- are the main photoactive substances in the photodegradation process. This research is prospected to offer a cornerstone for the in-situ transformation design of different types of heterojunctions.
He X.、Wang Y.、Liu T.、Li Y.、Jiang C.、Yang J.、Zhou H.、Cao W.、Chen C.
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School of Chemistry and Material Science Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control Nanjing Normal University
Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials Science Nanjing Normal University
Jiangsu Engineering Research and Development Center of Food Safety Department of Health Jiangsu Vocational Institute of Commerce
NSTL
Elsevier
