Ammonium Persulfate Modified Activated Carbon for Adsorption of Acrylate VOCs

Abstract

Modified activated carbons (AS) were fabricated through the oxidation effect of ammonium persulfate and applied to the dynamic adsorption of different acrylate gas. The pore structures, surface chemical properties and surface morphology of AS were respectively characterized by N₂ adsorption, Boehm titration, X-ray Photoelectron Spectroscopy (XPS) and scanning electron microscopy (SEM) techniques. After modification, the specific surface area increased from 954 to 1 154 m²·g⁻¹. The contents of oxygen-containing functional groups on the AS surface increase obviously and have a great effect on the adsorption behavior of acrylate gases. According to the results of dynamic adsorption, the adsorption capacities of acrylates are as the following order: methyl acrylate (461.9 mg·g⁻¹) > methyl methacrylate (436.9 mg·g⁻¹) > butyl acrylate (381.8 mg·g⁻¹), which is attributed to the size adaptability of AS pores and acrylates. The adsorption behavior of AS for acrylate gases conforms to the Bangham model and the Temkin model.

Keywords

activated carbon / ammonium persulfate / acrylate / adsorption

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