研究目的
To completely utilize the high redox ability of photo-induced charge carriers by constructing a Z-scheme photocatalyst of TiO2 QDs/Bi12TiO20 (TBT) composites for enhancing photocatalytic activity.
研究成果
The TBT composites exhibited higher photocatalytic activity than bare materials, attributed to the efficient separation of electron-hole pairs due to TQD fragment. The study found that the mechanism of TBT composites was a Z-scheme charge transfer process, maintaining strong photocatalytic activity.
研究不足
The materials with quantum size were easy to agglomerate, resulting in reducing active sites and photocatalytic activity. These quantum size based photocatalyst was difficult and energy consuming to separate and recover.
1：Experimental Design and Method Selection
A Z-scheme photocatalyst of TiO2 QDs/Bi12TiO20 (TBT) composites was prepared with TiO2 QDs fragment attached to the surface of Bi12TiO20 (BTO). The photocatalytic activity was evaluated by degradation of gatifloxacin (GF).
2：Sample Selection and Data Sources
Titanium (IV) n-butoxide, cyclohexane, oleylamine, oleic acid, bismuth oxide, ethanol, and TiO2 (Degussa-P25) were used as received without further purification.
3：List of Experimental Equipment and Materials
Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, photocurrent, Mott-Schottky, and electrochemical impedance spectroscopy (EIS) measurements.
4：Experimental Procedures and Operational Workflow
TiO2 QDs were prepared and loaded on the surface of BTO by simple mechanical mixing. The photocatalytic activity was evaluated under visible light illumination using a 250 W xenon lamp with a cutoff filter (λ > 400 nm).
5：Data Analysis Methods
The photocatalytic performance was analyzed by measuring the degradation of gatifloxacin (GF) under visible light illumination. The kinetic linear curves and rate constant were used to evaluate the photocatalytic activity.
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Titanium (IV) n-butoxide
Aladdin
Used as a titanium source for the preparation of TiO2 quantum dots.
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Cyclohexane
Aladdin
Used as a solvent in the preparation of TiO2 quantum dots.
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Oleylamine
Aladdin
Used as a surfactant in the preparation of TiO2 quantum dots.
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Oleic acid
Aladdin
Used as a surfactant in the preparation of TiO2 quantum dots.
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Bismuth oxide
Sinopharm Chemical Reagent Co., Ltd
Used as a bismuth source for the preparation of Bi12TiO20.
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Ethanol
Sinopharm Chemical Reagent Co., Ltd
Used as a solvent in the preparation of TiO2 QDs/Bi12TiO20 composites.
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TiO2 (Degussa-P25)
Degussa-P25
Sinopharm Chemical Reagent Co., Ltd
Used as a titanium source for the preparation of Bi12TiO20.
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