Removal of low-concentration formaldehyde in air by adsorption on activated carbon modified by hexamethylene diamine

Activated carbon (AC) was modified by hexamethylene diamine (HMDA) to remove low-concentration formaldehyde in air. Results demonstrate that no ammonia or amine compounds give out from the modified AC up to 423 K. And the modification significantly improves the adsorption performance of AC for formaldehyde. There exists an optimum loading amount, being around 0.04 g HMDA/g AC in this study.