研究目的
To develop gypsum photocatalytic materials dedicated to interior applications by combining gypsum plaster, modified TiO2/N photocatalyst, and glass fiber, and to study their self-cleaning properties, mechanical properties, and microstructure.
研究成果
The presence of glass fiber in TiO2/N-modified gypsum plaster significantly enhanced photocatalytic activity under both UV and visible light, with up to two times higher degradation rates for dyes. However, mechanical properties were not improved. Glass fiber may act as light ducts or retard charge recombination, but its exact role requires further investigation. The materials show promise for interior self-cleaning applications but need optimization for mechanical strength.
研究不足
The addition of glass fiber did not improve mechanical properties as expected, possibly due to poor adhesion between gypsum and glass fiber. The study used specific dyes and irradiation conditions, which may not represent all real-world pollutants or light sources. Further detailed studies are needed to understand the mechanisms of enhanced photoactivity with glass fiber.
1：Experimental Design and Method Selection:
The study involved modifying gypsum plaster with TiO2/N photocatalyst and glass fiber to enhance photocatalytic activity. Photocatalytic degradation of dyes (Methylene Blue and Reactive Orange) was tested under UV and visible light irradiation.
2：Sample Selection and Data Sources:
Gypsum plates were prepared with varying amounts of TiO2/N (1 and 3 wt.%) and glass fiber (
3：1, 3, 5 wt.%). Dyes were used as model pollutants. List of Experimental Equipment and Materials:
Gypsum plaster (Knauf MP 75), TiO2/N photocatalyst, glass fiber (E-glass type, chopped 12 mm), dyes (Methylene Blue, Reactive Orange), UV irradiation source (Cleo, 6x15W), visible light source (halogen bulbs, 70W each), colorimeter (CP-21), mechanical testing machine (Walter + bai OB 3000/200), SEM (Hitachi SU8020), EDX analyzer (Thermo Fisher Scientific).
4：Experimental Procedures and Operational Workflow:
Gypsum plates were prepared by mixing gypsum with photocatalyst, adding water, incorporating glass fiber, pouring into molds, demolding after 1 day, drying at 40°C. Photocatalytic tests involved staining plates with dye solutions, irradiating for specified times, and measuring color changes. Mechanical properties were tested using flexural and compressive strength measurements.
5：Data Analysis Methods:
Color changes were measured using CIELAB system and equations for ΔE and photocatalytic efficiency (RE). Statistical analysis included standard deviations.
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scanning electron microscope
SU8020
Hitachi
Elemental analysis and microstructure imaging
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gypsum plaster
MP 75
Knauf
Matrix substrate for the composite material
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glass fiber
E-glass type
Rozenblat
Reinforcement and potential enhancer of photocatalytic activity
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titanium dioxide
Aeroxide TiO2 P25
Evonik Industries
Reference photocatalyst for comparison
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autoclave installation
Autolab E 746
HEL Ltd.
Used for synthesis of TiO2/N photocatalyst under autogenous pressure
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colorimeter
CP-21
Measuring color changes in CIELAB system for photocatalytic efficiency
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testing machine
OB 3000/200
Walter + bai
Measuring flexural and compressive strength of samples
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energy dispersive X-ray analyser
Thermo Fisher Scientific
Elemental analysis alongside SEM
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UV irradiation source
Cleo
Providing UV light for photocatalytic tests
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visible light source
INQ
Providing visible light for photocatalytic tests
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