研究目的
To examine the effectiveness of a TiO2 synthesized in our laboratories modified with a transition metal (Fe) and a noble metal (Ag) for the degradation of salicylic acid from aqueous solutions at a concentration up to 15 mg/dm3.
研究成果
The study demonstrated that doping TiO2 with iron significantly improves its photocatalytic activity for the degradation of salicylic acid, especially at higher Fe content. The preparation method and metal content were key factors influencing the catalytic performance. The sol-gel method was found to enhance the textural properties of the catalysts, while wet impregnation decreased them. The most active catalysts were those with the highest Fe content, suggesting that Fe-doped TiO2 is a promising material for the removal of salicylic acid from aqueous solutions.
研究不足
The study focused on the photocatalytic degradation of salicylic acid under UV light, and the effectiveness of the catalysts was limited to the specific conditions and concentrations tested. The potential for optimization in terms of metal content and preparation methods was noted.
1：Experimental Design and Method Selection:
The study involved the synthesis of TiO2 nanoparticles doped or impregnated with Ag and Fe using sol-gel and wet impregnation methods. Characterization techniques included PXRD, nitrogen physisorption at 77 K, H2-TPR, NH3 chemisorption, and XPS.
2：Sample Selection and Data Sources:
Samples were prepared with varying metal content (0-5 wt.%) and characterized for their structural and photocatalytic properties.
3：List of Experimental Equipment and Materials:
Equipment included a Siemens D-5000 diffractometer, Micromeritics ASAP 2010 adsorption analyzer, Micromeritics TPR/TPD 2900 instrument, and SPECS Phoibos 150 1D-DLD spectrometer. Materials included titanium(IV) isopropoxide, isopropyl alcohol, hydrochloric acid, iron(III) nitrate nonahydrate, and silver nitrate.
4：Experimental Procedures and Operational Workflow:
The photocatalytic degradation of salicylic acid was evaluated under UV light, with samples taken every 15 min for analysis.
5：Data Analysis Methods:
The concentration of salicylic acid was estimated using Beer’s law from a calibration curve of organic contaminant concentration vs. absorbance.
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Siemens D-5000 diffractometer
D-5000
Siemens
Used for powder X-ray diffraction (PXRD) analysis
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UV-vis spectrometer
V-730
Jasco
Used to evaluate the concentration of the organic molecule
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titanium(IV) isopropoxide
Sigma-Aldrich
Precursor for the synthesis of TiO2
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isopropyl alcohol
Sigma-Aldrich
Solvent in the synthesis process
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hydrochloric acid
Acros
Used in the preparation of solution A
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iron(III) nitrate nonahydrate
Riedel-de Ha?n
Precursor for Fe doping
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silver nitrate
Panreac
Precursor for Ag doping
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salicylic acid
Sigma-Aldrich
Organic molecule for photocatalytic degradation tests
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Micromeritics ASAP 2010 adsorption analyzer
ASAP 2010
Micromeritics
Used for nitrogen physisorption at 77 K
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Micromeritics TPR/TPD 2900 instrument
TPR/TPD 2900
Micromeritics
Used for temperature programmed reduction (H2-TPR) and chemisorption of NH3
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SPECS Phoibos 150 1D-DLD spectrometer
Phoibos 150 1D-DLD
SPECS
Used for X-ray photoelectron spectroscopy (XPS) measurements
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MPDS-Basis system
MPDS-Basis
UV-Consulting Peschl
Used for photocatalytic performance evaluation
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PhotoLAB Batch-L reactor
Batch-L
UV-Consulting Peschl
Reactor for photocatalytic degradation tests
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medium-pressure Hg lamp
TQ 150Z1
Light source for photocatalytic degradation tests
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PolyScience Digital Temperature
PolyScience
Used to maintain a constant temperature during photocatalytic tests
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cyberscan pH 2100
pH 2100
Eutech
Used to measure pH values of the salicylic solution
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Durapore membrane filters
0.45 μm
Used to remove the catalyst from the suspension
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