Rapid Adsorption of Indoor Low-Concentration Formaldehyde by β-Cyclodextrin-Based Porous Organic Polymers
Jinze Yao, Xinyu Zhang, Daofei Lv, Jiajin Huang, Xingbei Wu, Ying Wu, Junliang Wu, Daiqi Ye, Qibin Xia
Abstract
Formaldehyde (HCHO) is one of the most universal and harmful indoor gas pollutants nowadays. Even a very low concentration of HCHO does great harm to human health. Herein, we developed a kind of porous organic polymer (P-CDP) as an adsorbent for the rapid removal of HCHO. The adsorption capacity of HCHO on P-CDP is 2.78 mg g–1 and the average adsorption rate in 10 min is 0.18 mg g–1 min–1 at a HCHO concentration of 1 ppm, which are 4.06 and 9.11 times higher than those of commercial coconut shell activated carbon (ACCO), respectively. The partition coefficient (PC) of P-CDP reaches 0.93 mol kg–1 Pa–1. More importantly, P-CDP shows excellent reusability, with no obvious loss of HCHO uptake after five adsorption–desorption cycles, indicating the good cycling stability of P-CDP. The high adsorption uptake and rapid adsorption rate of P-CDP for HCHO are attributed to the relatively strong electrostatic interactions together with the van der Waals forces between −F and −OH groups on P-CDP and HCHO molecules. This study demonstrates the great potential of P-CDP for practical use in the removal of low-concentration HCHO in indoor environments.