Abstract
Amino-functional graphene-sponge composites decorated by graphene nanodots (G-GND/S) were synthesized. The preparation technology prevents the loss of nano-materials and reduces the amount of graphene addition. G-GND/S was used as adsorbents to remove formaldehyde, and then their performances for formaldehyde adsorption were evaluated by dynamic adsorption experiment. The adsorption properties of three different materials: sponge, graphene-sponge, and GGND/ S, the breakthrough time and adsorption capacity had been compared, the results showed G-GND/S had better formaldehyde adsorption properties with longer breakthrough time (~2137 min/g) and adsorption ability of formaldehyde (22.8 mg/g). Large amounts of amine groups were the most important factor for the strength enhancement of the adsorption efficiency.
Highlights
Indoor air pollution has recently become a major concern, among the indoor volatile organic compounds (VOCs), formaldehyde is the most abundant airborne carbonyl chemical (Yu et al, 2013; Zhou et al, 2013)
graphene-sponge composites decorated by graphene nanodots (G-GND/S) was used as adsorbents to remove formaldehyde, and their performances for formaldehyde adsorption were evaluated by dynamic adsorption experiment
The adsorption properties of three different materials: sponge, graphene-sponge, and GGND/S, the breakthrough time and adsorption capacity had been compared, the results showed G-GND/S had better formaldehyde adsorption properties with longer breakthrough time (~2137 min/g) and adsorption ability of formaldehyde (22.8 mg/g)
Summary
Indoor air pollution has recently become a major concern, among the indoor volatile organic compounds (VOCs), formaldehyde is the most abundant airborne carbonyl chemical (Yu et al, 2013; Zhou et al, 2013). The adsorption method is commonly and effectively used in the elimination of formaldehyde due to its simplicity, less energy consumption, and without generating secondary pollutants (Lee and Kim, 2012; Beheshtian et al, 2013). Ma et al (2011) studied the removal of low-concentration formaldehyde using activated carbon modified by hexamethylene diamine and found that modification significantly improved the adsorption performance of AC (form 0.08 to 3.8 mg/g). Lee et al (2013) found that activated carbons with higher nitrogen content greatly improved the adsorption capacity and the breakthrough time. Carbon nanomaterials can be applied to remove formaldehyde and volatile organic compounds (VOCs) ((Lee and Kim, 2012).
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