Abstract
Among the hazardous organic and inorganic pollutants, organic dyes, nitrate (NO3-), carbon dioxide (CO2), and toxic heavy metals (THMs) are four types of hazardous contaminants that have become a serious global problem. Recently, perovskite photocatalysts have shown high efficiency in removing water and air contaminants. In this research, zero-valent iron nanoparticles (nZVI)- doped Al2ZnTiO6 (AZTO) double perovskite/graphitic carbon nitride (g-C3N4(gCN)) nanocomposite (NC) was firstly synthesized by the sol-gel method as a new high-efficiency perovskite photocatalyst. Also, the influence of the main factors such as solution pH, reaction time, photocatalyst dosage, and contaminants concentration on the photocatalytic performance of the nZVI-doped Al2ZnTiO9/g-C3N4 nanocomposite was evaluated. Due to the unique features of the nZVI-doped Al2ZnTiO6/g-C3N4 structure and suitable band gap position, which is suitable for the efficient migration e-/h+ charges dissociation and the enhancement of photocatalytic activity, this nanocomposite showed effective performance to the elimination of methyl orange (MO) anion, and methylene blue (MB) cation dye, NO3-, CO2, and THMs contaminants. The UV–visible spectra showed the elimination efficiency of 88%, 87%, 80%, 72%, and 90% for methyl orange anion dye, methylene blue cation dye, nitrate, carbon dioxide, and toxic heavy metals in optimal experiment conditions, respectively. Also, IEC and GC analysis showed an efficiency of 60% for the photoconversion of nitrate to harmless nitrogen gas (N2) and 42% for the photoconversion efficiency of CO2 to Methane (CH4) gas fuel. Eventually, the nZVI-doped Al2ZnTiO6/g-C3N4 nanocomposite displayed good recyclability and high photocatalytic activity compared to recently synthesized photocatalysts by testing its photocatalytic property after five repetitions.
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