研究目的
To design an innovative reactor for color removal from wastewater and to determine the optimum factors for color removal by photocatalytic process using TiO2 coated on various substrates (glass, ceramic tile, stainless steel) via doctor blade coating, and to test with synthetic and actual dye wastewaters.
研究成果
TiO2-coated glass under UVC irradiation achieved the highest color removal efficiency (93.03% for synthetic and up to 87.86% for actual wastewater at pH 11), with good recyclability over 20 cycles. The innovative reactor design is effective, but performance decreases with lower pH. Future work could focus on optimizing for different wastewaters and scaling up.
研究不足
The study is limited to specific substrates and coating conditions; scalability to industrial applications may require further optimization. The use of UV light sources (UVA and UVC) may not be cost-effective for large-scale treatment, and the pH range tested (3-11) might not cover all industrial wastewater conditions. Additionally, the long-term stability and potential release of TiO2 particles were not fully addressed beyond 20 cycles.
1：Experimental Design and Method Selection:
The study used sol-gel synthesis for TiO2 and doctor blade coating on substrates. Photocatalytic degradation was assessed under UVA and UVC irradiation in a custom reactor with recirculation.
2：Sample Selection and Data Sources:
Substrates included transparent glass, glazed ceramic tile, and 304 stainless steel sheets. Synthetic wastewater was methylene blue solution; actual wastewater was from a textile industry in Thailand.
3：List of Experimental Equipment and Materials:
Materials included titanium(IV) n-butoxide, acetylacetone, methanol, propanol, PVP, methylene blue, deionized water, and substrates. Equipment included UV lamps (36W UVA, 30W UVC), peristaltic pump, magnetic stirrer, spectrophotometer, SEM, EDS, XRD.
4：Experimental Procedures and Operational Workflow:
Substrates were cleaned, coated with TiO2 via doctor blade, calcined. Photocatalytic tests involved circulating wastewater over coated substrates under UV light, sampling at intervals, and measuring absorbance.
5：Data Analysis Methods:
Color removal efficiency calculated using absorbance measurements; kinetics analyzed with Langmuir-Hinshelwood model; characterizations done with SEM, EDS, XRD.
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