研究目的
To develop carbonaceous materials hybridized with anatase TiO2 for efficient photocatalytic reduction of Cr(VI) under narrow visible light.
研究成果
The AC-TiO2, OP-TiO2, and WS-TiO2 composites demonstrated enhanced photocatalytic activity for Cr(VI) reduction under visible light due to band gap narrowing, self-photosensitization, and improved electron transfer. Lignocellulosic biomass-TiO2 composites are effective, low-cost alternatives for environmental remediation.
研究不足
The study is limited to specific biomass sources (activated carbon, olive pits, wood shavings) and conditions (pH 3, presence of tartaric acid). The performance under broader light spectra or other pollutants was not explored, and scalability or long-term stability may require further investigation.
1：Experimental Design and Method Selection:
The study used an ultrasonic-assisted sol-gel process to synthesize composites of TiO2 with activated carbon, olive pits, and wood shavings, followed by calcination at 500°C. The photocatalytic activity was evaluated under UV and visible light irradiations.
2：Sample Selection and Data Sources:
Samples included activated carbon, olive pits, and wood shavings collected from industrial sources, processed and hybridized with TiO2. Cr(VI) solutions were prepared from K2Cr2O
3：Cr(VI) solutions were prepared from K2Cr2OList of Experimental Equipment and Materials:
7. 3. List of Experimental Equipment and Materials: Equipment included SEM (Hitachi SU8000), XRD (PANalytical X’PERT-PRO), FTIR (Nicolet iZ10), BET (ASAP 2460), UV-DRS (Hitachi U-3900), XPS (PHI Quantum), photocurrent measurements (CHI Electrochemical Workstation), and photocatalytic tests with a PLS-SXE300 Xenon lamp. Materials included Titanium(IV) n-butoxide, ethanol, tartaric acid, and others as specified.
4：Experimental Procedures and Operational Workflow:
Photocatalysts were prepared by dispersing biomass in water, adding titanium precursor, stirring, sonicating, filtering, drying, and calcining. Photocatalytic tests involved mixing photocatalyst with Cr(VI) solution, dark adsorption for 30 min, light irradiation, addition of tartaric acid, and sampling for analysis.
5：Data Analysis Methods:
Data were analyzed using UV/Vis spectrophotometry for Cr(VI) concentration, ICP-OES for total chromium, and pseudo-first-order kinetics for rate constants.
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UV-Vis Spectrophotometer
U-3900
Hitachi
Recording UV-VIS DRS spectra
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ICP-OES
Optima 8300
PerkinElmer
Evaluating total chromium concentration
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Scanning Electron Microscope
SU8000
Hitachi
Obtaining SEM images for morphology analysis
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X-ray Diffractometer
X’PERT-PRO
PANalytical
Characterizing crystal structures by XRD
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FT-IR Spectrometer
iZ10
Nicolet
Fourier transform infrared spectroscopy analysis
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Surface Area and Porosity Analyzer
ASAP 2460
Measuring BET surface areas
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XPS Instrument
PHI Quantum
Analyzing surface chemistry by XPS
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Electrochemical Workstation
CHI
Evaluating photocurrent measurements
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Xenon Lamp
PLS-SXE300
PerfectLight
Source of light for photocatalytic tests
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Visible Lamp
LABEL, 25 W E27 220V, 50 Hz
Philips
Testing photocatalytic activity under visible light
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