Adsorption of Low Concentration Formaldehyde in Air Using Ethylene-Diamine-Modified Diatomaceous Earth

Abstract

Formaldehyde is one of the most common difficult-to-eliminate indoor air pollutants. Among the available methods of eliminating formaldehyde, adsorption is still the most commonly used due to its simplicity, efficiency, and economic viability. This study investigated the potential of diatomaceous earth (DE) adsorbent for formaldehyde (low concentration in air). DE was considered because of its high silica content and high porosity. It also examined the effect of adding ethylene-diamine (EDA) on the adsorption performance of DE. Amine groups have been proven to improve the adsorption of formaldehyde through their reaction that produces imine. The amount of added EDA was varied from 0.25 to 0.75 g per gram of DE. For pure DE adsorbent, the adsorption performance was 298 mg/g. Adding 0.75 g of EDA resulted in maximum DE adsorption performance (565 mg/g). EDA-modified DE was shown to be a potential adsorbent for removing formaldehyde in air.

Performance of a CO 2 sorbent for indoor air cleaning applications: Effects of environmental conditions, sorbent aging, and adsorption of co‐occurring formaldehyde

“…32,33 In the case of amine-based sorbents, formaldehyde and other carbonyls can be trapped by chemisorption through the formation of imines (Schiff base). 21,23,[34][35][36] Similarly, carboxylic acids were shown to chemisorb through acid-base interactions. 37 CO 2 adsorption kinetic data are important for the design of a CO 2 removal system, and simulation of its operation as a component of a building's HVAC system.…”

Efficient removal of gaseous formaldehyde in air using hierarchical titanate nanospheres with in situ amine functionalization

“…10,[37][38][39][40][41][42][43] To the best of our knowledge, 2D titanate nanosheets or their assemblies have not been studied as HCHO adsorbents up to now. In this unique onepot synthesis protocol, a typical organic amine (diethylenetriamine, DETA) instead of traditional inorganic base is selected to mediate the overall synthesis processes.…”

Levels and Health Risk of Carbonyl Compounds in Air of the Library in Guangzhou, South China

“…Formaldehyde, one of the most abundant carbonyls in air, has been classified as a human carcinogen by the International Agency for Research on Cancer (IARC) due to its carcinogenicity (IARC, 2006). Formaldehyde is used extensively in construction, wood processing, furniture, textiles, carpeting, and in the chemical industry (Bernabe et al, 2015;Leuchner et al, 2016). By 2007, the production of formaldehyde in China had reached a staggering 12,000 kt, accounting for about 34% of the total global output (Tang et al, 2009).…”