Characteristics and Influence Factors of Pb(II) Adsorption by Graphene Oxide‐Montmorillonite Composite

Abstract

This study presents the fabrication of a novel porous composite of graphene oxide‐montmorillonite (GO‐MMT) through the modification of montmorillonite using the freeze‐drying method for the purpose of Pb removal. The characterization of the GO‐MMT composite was conducted using scanning electron microscopy, Fourier transform infrared spectrometry, and X‐ray diffraction. The results from batch adsorption experiments revealed that the GO‐MMT composite exhibited a superior capacity for Pb removal compared to MMT. Furthermore, a single factor experiment confirmed that the dosage of the GO‐MMT composite or GO, pH, temperature, and reaction time all significantly influenced the adsorption of Pb by the GO‐MMT composite, MMT, or GO. This superiority can be attributed to the presence of oxygen‐containing functional groups, the site‐blocking effect, and the ion exchange mechanism exhibited by the GO‐MMT composite.