Effect of pH on the adsorption and photocatalytic degradation of sulfadimidine in Vis/g-C 3 N 4 progress

Abstract

In this study, g-C₃N₄ was synthesized by thermal polycondensation of melamine and was characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, UV–visible diffuse reflection spectroscopy, and scanning electron microscopy. Results showed that g-C₃N₄ degraded sulfadimidine (SMD) under visible light, in which the adsorption and photocatalytic degradation was influenced by pH. The maximum adsorption capacity was achieved at approximately pH 5. The highest degradation rate constant was obtained at strong acid and alkali. In addition, the degradation mechanism of g-C₃N₄ was evaluated with the help of quencher agents. The intermediates, degradation pathways, and mineralization of SMD were also determined to evaluate the degradation and oxidation ability of g-C₃N₄.

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