Fabrication of carboxylic acid-functionalized robust chitosan-polyvinyl alcohol composite material for selective adsorption of Hg (II) in water
writer：Jing Zhao，Xuan Zhang*
keywords：Chitosan, Polyvinyl alcohol, Mercury removal, Robust adsorbent
source：期刊
specific source：International Journal of Biological Macromolecules 2025, 309, 143142
Issue time：2025年
Toxic heavy metal ions pollution in water source is high risk to public health. Efficient removal of Hg(II) with low cost adsorbent materials is an important strategy. In this study, carboxylic acid-functionalized chitosan-polyvinyl alcohol composite material (PVA-CS-COOH) was facilely fabricated to develop cheap and efficient adsorbent for Hg(II). The PVA-CS-COOH exhibited high selectivity toward Hg(II) and the adsorption capacity could reach 353.37 mg/g at 318 K. More importantly, the adsorption capacity remained >90 % after 20 adsorption-desorption cycles, revealing a robust nature and excellent recoverability. The adsorption kinetics and isotherms studies demonstrated that the adsorption behavior of PVA-CS-COOH was well consistent with the secondary kinetic model and the Langmuir model, respectively. The synergistic coordination and electrostatic interactions could play important roles in Hg(II) adsorption on PVA-CS-COOH composite materials.