Abstract
Formaldehyde has a significant impact on human health. This study used a simple dipping method to load graphene-titanium dioxide (GR-TiO2) on activated carbon fibers (ACFs). The microstructure of GR-TiO2/ACF hybrid material was observed by SEM, combined with XRD and BET analysis. The result showed that the GR-TiO2/ACF hybrid material had a specific surface area of 893.08 m2/g and average pore size of 2.35 nm. The formaldehyde degradation efficiency of the prepared material was tested under different conditions, such as ultraviolet (UV) radiation, air supply volume, relative humidity, initial mass concentration. The results showed that the UV radiation intensity, airflow and the initial mass concentration were positively correlated with the formaldehyde removal rate, and the relative humidity was negatively correlated with the formaldehyde removal rate. The GR-TiO2/ACF hybrid material had a maximum formaldehyde removal rate of 85.54% within 120 min.
Highlights
People spend most of their time indoors, and pollutants in indoor air are an important cause of human diseases [1,2,3,4]
It can be observed that the surface of the activated carbon fibers (ACFs) fiber monofilament is wrapped by the GR-TiO2 photocatalyst
A relatively uniform film is attached to the ACF surface, and its gully structure can be clearly observed, indicating that the load condition is good
Summary
People spend most of their time indoors, and pollutants in indoor air are an important cause of human diseases [1,2,3,4]. As a kind of indoor air purification technology with a simple process and no secondary pollution, many studies have been carried out on photocatalysis [11] It can oxidize formaldehyde and other VOCs into CO2 and water in indoor environments. With a large specific surface area and rich microporous structure, ACF can provide more surface area for the photocatalyst to remove indoor pollution to improve the purification effect and is currently often used as a carrier for adsorption-photocatalytic composite materials [31,32,33,34,35]. It may be a good method to combine graphene, TiO2 and ACF to synthesize composites for indoor formaldehyde degradation This combination can improve the adsorption and photocatalytic effect of the material on formaldehyde degradation [36]. Light intensity of the UV light was measured by TES-1333 data logging solar power meter (TES Electrical Electronic Corp., Taiwan, China)
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