研究目的
Investigating the fabrication of undoped and Fe-doped TiO2 nanoparticles and nanotubes, the effect of Fe-doping content on the photocatalytic activity of TiO2 nanotubes, and the mechanism of enhancing photocatalytic activity by Fe-doping.
研究成果
Undoped and Fe-doped TiO2 nanotubes with Fe molar content of 0–3.86 % were fabricated by a sol-gel route followed by hydrothermal treatment in KOH solution and annealing crystallization. The Fe-doping decreased average particle size and extended the absorbance edges to visible light region of ~449 nm (~2.76 eV) as Fe content equals maximal doping amount of 3.86 at.%. The nanotubes show large specific surface area. Increasing Fe content and initial solution pH can increase the sunlight-excited photodegradation rate of methyl orange in the water on the nanotubes. The quasi-kinetic rate constants are in a range of ~0.133–0.513 h-1 that increased as the increase of Fe content and initial pH. Large specific surface area and high photocatalytic activity make the Fe-doped TiO2 naotubes are promising photocatalytic nanomaterials.
研究不足
The technical and application constraints of the experiments, as well as potential areas for optimization, were not explicitly mentioned in the paper.
1：Experimental Design and Method Selection:
The undoped and Fe-doped TiO2 nanoparticles (NPs) were synthesized by a sol-gel process. Butyl titanate and ferric nitrate were dissolved in ethanol according to a Fe molar contents of 0, 1, 2, and 3 %. The TiO2 nanotubes (NTs) were fabricated by hydrothermally treating the NPs in 8 mole·l-1 KOH aqueous solution at 110 °C for 24 h.
2：Sample Selection and Data Sources:
The phase of the NPs and NTs were identified using an X-Ray diffractometer. The morphology and X-ray energy dispersive spectra (EDS) of the NPs and NTs were analyzed using a transmission electron microscopy.
3：List of Experimental Equipment and Materials:
X-Ray diffractometer (XRD, CuK(cid:3)1, (cid:4)=
4：15406nm, Model No:
D/Max-2200PC, Rigaku, Japan), transmission electron microscopy (TEM, Model No: JEM-3010, Japan), UV-vis spectrophotometer (Model No: Lambda 950, Bruker Daltonics, USA), surface analyzers (Model no: Autosorb-6iSA, Quantachrome Instruments, US).
5：Experimental Procedures and Operational Workflow:
Photodegradation experiments were performed in glass beaker at room temperature of ~25 °C. In each experiment, 100 mg NTs and 50 ml methyl orange aqueous solution with concentration of 5(cid:2)10-6 mole·l-1 were added to a glass breaker. The summer sunlight with illumination intensity of ~1000 W/m2 was used as light sources.
6：Data Analysis Methods:
The concentration variation of the methyl orange aqueous solutions on the NTs with the irradiation time of the sunlight was measured. The kinetic relation between the concentration (C) of the orange methyl aqueous solution and the photocatalytic reaction time (t) was analyzed.
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