Removal of Formaldehyde by Hydroxyapatite Layer Biomimetically Deposited on Polyamide Film

Abstract

Some harmful volatile organic compounds (VOCs), such as formaldehyde, are regulated atmospheric pollutants. Therefore, development of a material to remove these VOCs is required. We focused on hydroxyapatite, which had been biomimetically coated on a polyamide film, as an adsorbent and found that formaldehyde was successfully removed by this adsorbent. The amount of formaldehyde adsorbed increased with the area of the polyamide film occupied by hydroxyapatite. The amount of adsorbed formaldehyde and its rate of adsorption were larger for hydroxyapatite deposited on polyamide film than for the commercially available calcined hydroxyapatite powder. This high adsorption ability is achieved by the use of nanosized particles of hydroxyapatite with low crystallinity and containing a large number of active surface sites. Therefore, hydroxyapatite biomimetically coated on organic substrates can become a candidate material for removing harmful VOCs such as formaldehyde.

Highly active manganese oxide catalysts for low-temperature oxidation of formaldehyde

“…Due to stringent environmental regulations for human health protection, low-temperature catalytic oxidation of formaldehyde (HCHO) to CO 2 and H 2 O has become an attractive research topic [1][2][3][4][5]. In the past decades, a variety of catalysts, including metal oxides [3,6], composite oxides [7], and supported noble metals [8] have been investigated for the HCHO emission control.…”

“…4 was then added in the solution. The reaction proceeded with the appearance of a brown precipitate within a few minutes.…”

Surviving Mass Extinctions through Biomineralized DNA

“…HAp is able to adsorb contaminants like formaldehyde [47] whereas it enhances their further catalytic oxidation [18] at room temperature. A high adsorption of cyanide ions by HAp is reported to be a promising air purification system.…”

Instantaneous and Complete Decomposition of Formaldehyde by Thermally Activated Oxide Semiconductors

“…The FA elimination can basically be achieved by catalytic combustion 1) in the temperature range 300-500 C. However, this is a large-scale removal system and also requires a large investment. Abatement by the use of absorbents 2) requires regeneration or disposal after a certain period. Also, they need regular replacement, so that the risk of FA escape after saturation is a problem.…”