Effect of Low-Temperature Heat Treatment on PM2.5 Adsorption Properties of GO Films

Abstract

To explore the mechanism of GO acting on PM[Formula: see text], a graphene oxide (GO) film was prepared via a spraying method for air purification. The effects of different media, temperature and heat treatment times on the adsorption of PM[Formula: see text] on GO film were investigated. The morphology, composition and structure of GO materials were characterized by scanning electron microscopy (SEM), electron spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FT-IR) and Raman spectroscopy. When the vacuum heat-treatment temperature is below 80∘C and the atmospheric heat-treatment temperature is below 100∘C, the air purification performance of the film does not change significantly. With the increase in the vacuum heat-treatment temperature, the removal efficiency of PM[Formula: see text] by GO film decreases gradually from 95% to 83%. At different times, the vacuum heat treatment increases with time, and the film removal rate shows a downward trend. As the heat-treatment temperature and time increase, a certain redox reaction occurs in the GO, and the air purification performance decreases. At a temperature of 120∘C and a time of 8[Formula: see text]h, the removal rate drops to 81.68%. The adsorption of PM[Formula: see text] by GO film mainly relies on the action of oxygen-containing functional groups.