研究目的
To determine how active component-support interactions and change in phases due to different titanium sources affect the degree of photocatalytic degradation of methylene blue and phenol under visible light or UV of different wavelengths.
研究成果
The photocatalytic degradation efficiency of methylene blue and phenol depends on the nature of the support and the titanium precursor. The removal trend was TiO2/SiO2 < TiO2/Al2O3 << TiO2/ZSM-5. The study highlighted the importance of support and precursor selection for efficient chemisorptions and photocatalytic decomposition of organic compounds from aqueous solutions.
研究不足
The study was limited to the photocatalytic degradation of methylene blue and phenol under specific conditions (visible light or UV irradiations of 254 and 365 nm). The effects of other wavelengths or conditions were not explored. Additionally, the study focused on a limited set of supports and titanium precursors.
1：Experimental Design and Method Selection:
The study involved preparing titanium-based catalysts using impregnation method on different supports (SiO2, Al2O3, ZSM-5) and titanium precursors (TiO2 or TiCl4). The catalysts were tested under visible light or UV irradiations of different wavelengths (254 and 365 nm).
2：4). The catalysts were tested under visible light or UV irradiations of different wavelengths (254 and 365 nm). Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The catalysts were characterized using BET, XRD, FTIR, and TGA to obtain their physico-chemical characteristics.
3：List of Experimental Equipment and Materials:
Chemicals used included titanium dioxide powder, titanium(IV) chloride, phenol crystals, aluminum oxide, methylene blue, ethanol, silicon dioxide, and ZSM-5. Equipment included a Philips PW1710 powder diffraction, Quantachrome Autosorb-1 nitrogen adsorption apparatus, Perkin Elmer FTIR spectrum 2000 spectrometer, and thermogravimetric analyser SDT
4：Equipment included a Philips PW1710 powder diffraction, Quantachrome Autosorb-1 nitrogen adsorption apparatus, Perkin Elmer FTIR spectrum 2000 spectrometer, and thermogravimetric analyser SDT Experimental Procedures and Operational Workflow:
2960. 4. Experimental Procedures and Operational Workflow: The photocatalytic activities were evaluated in a Chromato-vue C-70G viewing system reactor. Reactions were conducted at room temperature and neutral pH conditions for 1 h, with samples taken at 15 min intervals for analysis.
5：Data Analysis Methods:
The change in compositions of the compounds was measured using a UV-visible Spectrometer. The data were fitted to Langmuir-Hinshelwood model and pseudo-second-order kinetic model for analysis.
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Perkin Elmer FTIR spectrum 2000 spectrometer
Spectrum 2000
Perkin Elmer
Used for obtaining FTIR spectra of the catalysts.
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titanium dioxide powder
Used as a titanium precursor for catalyst preparation.
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titanium(IV) chloride
Used as a titanium precursor for catalyst preparation.
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aluminum oxide active neutral
BDH chemicals limited, Poole, England
Used as a support for the catalyst.
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methylene blue
Used as a model pollutant for photocatalytic degradation tests.
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silicon dioxide
Sigma Aldrich, Germany
Used as a support for the catalyst.
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ZSM-5
Zeolyst International
Used as a support for the catalyst.
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Philips PW1710 powder diffraction
PW1710
Philips
Used for X-ray diffraction analysis of the catalysts.
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Quantachrome Autosorb-1 nitrogen adsorption apparatus
Autosorb-1
Quantachrome
Used for measuring BET surface area and total pore volume of the catalysts.
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thermogravimetric analyser SDT 2960
SDT 2960
Used for observing mass and energy changes profiles of the catalysts.
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Chromato-vue C-70G viewing system reactor
C-70G
Ultra violet products, Inc., San Gabriel, CA, USA
Used for evaluating the photocatalytic activities of the prepared catalysts.
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UV-visible Spectrometer
Perkin Elmer, USA
Used for measuring the change in compositions of the compounds.
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