Abstract
Indoor formaldehyde purification is a crucial subject that has received much attention to enhance indoor air quality. Photocatalytic technology can degrade formaldehyde into harmless small molecules and avoid secondary pollution. To improve the photocatalytic purification efficiency, the photocatalysts were loaded on the flexible porous material to degrade indoor formaldehyde. The TiO2-4% carbon nanotubes/nonwoven fabric showed 20% higher photocatalytic performance than pure TiO2. The influence of airflow organization on the photocatalytic process was analyzed by experiment and CFD method. The formaldehyde degradation efficiency could be increased by more than 10% with the air flow of same-side downward and upward return. The interactions between ventilation and photocatalysis were investigated. Under continuous ventilation, the photocatalytic process can also effectively improve the purification efficiency of formaldehyde, and the purification rate of indoor formaldehyde can reach 97% under the combined action of ventilation and photocatalysis in 30 min.
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