研究目的
To verify the concept of directing UV light through a light-conducting membrane substrate for photocatalytic membrane cleaning, addressing inefficiencies in existing methods.
研究成果
The light-conducting photocatalytic membrane effectively conducted UV for photocatalytic degradation and fouling mitigation. Directing UV through the substrate maintained cleaning efficiency better across cycles compared to over the active layer, suggesting potential for long-term use in water treatment with reduced chemical cleaning.
研究不足
The study was conducted ex-situ; in-situ verification over prolonged periods is needed. The substrate geometry and size for practical applications are unknown and require future study. Potential cost considerations for full-scale implementation were not addressed.
1:Experimental Design and Method Selection:
The study involved preparing a UV-conducting membrane by dip coating TiO2 onto a sintered glass substrate and comparing UV application methods (through substrate vs. over active layer) for photocatalytic degradation and fouling mitigation.
2:Sample Selection and Data Sources:
Humic acid (HA) and screened methyl orange (sMO) were used as model compounds; sintered glass discs (25 mm diameter, 2 mm thickness, G5 porosity) served as substrates.
3:List of Experimental Equipment and Materials:
Equipment included UV lamps, filtration modules, furnaces, pumps, balances, sonic baths, FTIR and XRD spectrometers, porometer, spectrophotometer, TOC analyzer. Materials included TiO2 P25, HA, BSA, sMO, chemicals like methanol, nitric acid, acetone.
4:Experimental Procedures and Operational Workflow:
Membranes were cleaned, coated with TiO2 via dip coating, heat-treated, and characterized. Degradation experiments (e.g., A1-A8 for sMO) and filtration tests (e.g., B1-B5 for HA) were conducted with UV exposure and cleaning methods.
5:Data Analysis Methods:
Pseudo-first-order kinetics for dye degradation, fouling rate calculations, cleaning efficiency formulas, and rejection rates using TOC measurements.
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FTIR Spectrometer
Perkin Elmer Frontier
Perkin Elmer
Analyze surface functional groups
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XRD diffractometer
Rigaku Mini Flex 600
Rigaku
Confirm crystal structure of photocatalyst
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TOC analyzer
Shimadzu TOC-V CSH
Shimadzu
Determine total organic carbon
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UVA lamps
6 × 18 W
A.U.V.S (Ops), Pty. Ltd.
Provide UV light for photocatalytic reactions
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UV irradiance meter
Photoelectric Instrument Factory of Beijing Normal University
Measure UV intensity
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Digital manometer
TPI 665L
Accutherm
Measure transmembrane pressure (TMP)
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Furnace
Vulcan 3-550PD NEY
Extech Equipment
Heat treatment of membranes
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Peristaltic pump
Masterflex 7592-45
Cole-Parmer
Drive feed through membrane in dead-end mode
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Electronic balance
FX-3000i WP
A&D Company Ltd.
Measure permeate amount
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Sonic bath
Soniclean 500HT
Transtek Systems
Clean membranes and remove air bubbles
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Porometer
Quantachrome Porometer 3 GZ series
Quantachrome
Determine pore size by capillary flow porometry
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UV-Visible spectrophotometer
UV-Visible-Biochrom Libra 522
Biochrom
Measure absorbance of solutions
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Membrane filter
0.45 μm
ADVANTEC
Remove suspended solids from HA stock solution
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