Formaldehyde removal from air via a rotating adsorbent combined with a photocatalyst reactor: Kinetic modeling

The combination of heterogeneous photocatalysis with chemical and physical operations: A tool for improving the photoprocess performance

“…Shiraishi et al [145], by combining photocatalysis with adsorption and thermal regeneration, developed a novel air-purification system consisting of a rotating honeycomb loaded with zeolite or activated carbon, combined with a photoreactor able to eventually oxidize the desorbed volatile contaminants. Chin et al [146] developed a kinetic model for a rotating adsorbent-photocatalyst reactor able to remove formaldehyde in air. Vapour formaldehyde was adsorbed from a simulated room onto a slowly rotating honeycomb that then passed through a small chamber in which locally recirculated heated air desorbed the formaldehyde and carried it through a photocatalytic reactor where the desorbed formaldehyde was oxidized.…”

“…The advantages of this combination are that it allows rapid air contaminant removal followed by desorption into a small volume photoreactor where the consequent increase in contaminant concentration allows the use of a reactor smaller than a photocatalyst-only system would require. The model developed by Chin et al [146] provides a technique for evaluating all the numerical parameters of the system, i.e. the adsorption, desorption and reaction rate constants, as well as the adsorption equilibrium constants, and so it can be applied to correctly design systems with different adsorption/desorption temperatures, adsorbent materials and chamber sizes.…”

Adsorptive Removal of Formaldehyde by Chemically Bamboo Activated Carbon with addition of Ag nanoparticle: Equilibrium and Kinetic

“…Maintaining adequate indoor air quality through controlling ambient concentrations of formaldehyde is recommended, although the relationships between air quality and formaldehyde rarely determined. Formaldehyde with a high level can cause symptoms such as eye, nose, and throat irritation, chest pains, bronchitis, and prolonged formaldehyde has associated with reduced pulmonary function and asthma [1,2]. General methods are being used to purify the polluted air, including adsorption [3], membrane, absorption, plasma decomposition [4], and photocatalytic oxidation [5] techniques.…”

Effects of Silver on the Photocatalytic Degradation of Gaseous Isopropanol

“…Volatile organic compounds (VOCs) are typical gaseous emissions from numerous industries and pose various hazards for human health and environment (Chin et al 2006). Many technologies currently used for the treatment of VOCs, such as carbon adsorption or wet scrubber, merely transfer VOCs from the gas phase to another phase.…”

“…In recent years, photocatalytic technologies are studied and reported to be effective on oxidizing several VOCs at mild conditions. (Chin et al 2006;Mohseni and David 2003;Doucet et al 2006;Xu and Raftery 2001;Einaga et al 2004;Strini et al 2005). However, the practical application of photocatalytic processes for the treatment of volatile organic pollutants in gaseous streams is hindered by the development of effective photocatalysts.…”