研究目的
Investigating the visible light photocatalytic dye decomposition behavior of Zn2TiO4 nanoparticles grown by solid state reaction method, including reaction kinetics and rate constant.
研究成果
Zn2TiO4 nanoparticles exhibit effective visible light photocatalytic dye decomposition with pseudo first order kinetics and a rate constant of 0.069 min?1. The activity is attributed to defect levels facilitating charge separation, and the low cost of materials makes it promising for practical applications in water purification.
研究不足
The band gap of Zn2TiO4 is large (3 eV), limiting visible light absorption without defect levels; minor residual phases of ZnO and TiO2 may affect purity; the method may not be scalable for industrial applications without optimization.
1：Experimental Design and Method Selection:
The study uses a solid state reaction method to grow Zn2TiO4 nanoparticles, followed by characterization using various techniques and photocatalytic activity assessment under visible light. Theoretical models include pseudo first order kinetics for reaction analysis.
2：Sample Selection and Data Sources:
Nanoparticles are synthesized from ZnO and TiO2 powders (Fisher Scientific, purity
3：99%) in a
1 molar ratio. Methylene blue (MB) dye solution (2.5 × 10?5 M) is used for photocatalytic tests.
4：5 × 10?5 M) is used for photocatalytic tests. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes FESEM, TEM (JEOL-2010), XRD, UV-vis spectrophotometer (UV-2450, Shimadzu), BET analyzer, 500 W halogen lamp, magnetic stirrer, and scavengers like IPA and EDTA. Materials are ZnO, TiO2, acetone, MB dye.
5：Experimental Procedures and Operational Workflow:
Nanoparticles are ground in acetone for 3 h and calcined at 950 °C for 2 h. Characterization is done via XRD, FESEM, TEM, DRS, PL, and BET. Photocatalytic activity is tested by irradiating MB solution with nanoparticles under visible light, with samples taken at intervals for absorption spectroscopy to measure degradation. Scavenger experiments use IPA and EDTA to identify active species.
6：Data Analysis Methods:
Data is analyzed using linear fitting for reaction kinetics (ln(C0/C) vs. time), Gaussian fits for PL spectra, and standard formulas for degradation efficiency.
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Transmission Electron Microscope
JEOL-2010
JEOL
Analysis of nanoparticle morphology and lattice fringes
-
UV-vis Spectrophotometer
UV-2450
Shimadzu
Diffuse reflectance spectroscopy and absorption measurements
-
Field Emission Scanning Electron Microscopy
Characterization of nanoparticle morphology and size
-
X-ray Diffraction
Crystal structure analysis
-
Halogen Lamp
500 W
Visible light source for photocatalytic experiments
-
Magnetic Stirrer
Mixing during photocatalytic reactions
-
ZnO Powder
Product No. 28975
Fisher Scientific
Precursor for nanoparticle synthesis
-
TiO2 Powder
Product No. 28375
Fisher Scientific
Precursor for nanoparticle synthesis
-
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