Haloperoxidase-Like Activity of the Mn3O4/g-C3N4 Nanocomposite Used for Ultrafast Degradation of Methylene Blue and Crystal Violet Dyes
摘要
We report the synthesis of a Mn3O4/g-C3N4 nanocomposite through a thermal pyrolysis method and its use as a catalyst for the rapid degradation of Methylene Blue (MB) and Crystal violet (CV) dyes. This catalyst has additionally been utilized in the haloperoxidase-like activity. The as-synthesized nanocomposite was characterized using various techniques to analyze its structure, morphology, chemical composition, bandgap, charge separation and so on. The Mn3O4/@g-C3N4 nanocomposite exhibited excellent photodegradation of MB dye at optimum pH of 12 under the exposure of solar light. The degradation percentage of MB dye was approximately 92% within 15 min. The nanocomposite was also utilized to evaluate its degradation efficiency for crystal violet (CV) dye, achieving around 99% degradation within 60 min. The Pseudo-first order rate constants for the degradation of MB and CV dyes are 0.121 min− 1 and 0.103 min− 1 respectively. The Mn3O4/g-C3N4 nanocomposite is used to study haloperoxidase activity and demonstrated remarkable effectiveness in the enzymatic reaction. The stability assessments indicated the nanocomposite’s potential stability. The scavenging experiment revealed that the superoxide ion radical (O2..−) is the key reactive species, among other scavengers, that enhances the photodegradation process. This work is the first time reported halo peroxidase-like activities of any nanocomposite alongside the photodegradation of pollutant dyes.