Hygroscopic sterilization synergistic effect of UiO-66-NH2@Potassium polyacrylate/carbon fiber negative ions electrode

Abstract

Indoor air pollution is a major challenge faced by mankind. and tiny negative ions are one of the ideal answers to the problem of indoor air pollution. This method to purify indoor air has received increasing attention in recent years. In this work, a design method of potassium polyacrylate/carbon fiber (UN-PK-CF) composite unidirectional negative ions generating electrode which modified by UiO-66-NH₂ is presented. UiO-66-NH₂ particles are uniformly dispersed within the potassium polyacrylate (PK) hydrogel matrix, facilitating efficient moisture absorption. The natural pores formed during the PK hydrogel curing process effectively store the absorbed water and buffer the release of water in low humidity. One-dimensional carbon fibers, arranged as a skeleton within the hydrogel medium, facilitate rapid charge transfer and discharge from tip to generate negative ions and ROS. The UN-PK-CF electrode developed in this study exhibits outstanding moisture resistance and possesses the capability to harvest and utilize environmental water. Especially under the condition of low humidity, the sterilization rate of the electrode can reach nearly 99% under the coordination of adsorbed water.