Composite Photocatalysts of CNTS-TiO2: An Efficient Photocatalyst for the Degradation of Ammonia Nitrogen Pollutant in Mariculture Wastewater under UV Light Irradiation

Abstract

In this study, composite photocatalyst of CNTS-TiO2 is employed to degrade ammonia nitrogen pollutant in mariculture wastewater under UV light irradiation. The photocatalyst was prepared by a sol-gel method and was characterized by SEM and XRD analysis.The photocatalytic degradation efficiency of ammonia nitrogen was analysed by various experimental parameters namely dosage, initial concentration of ammonia nitrogen, pH value, the concentration of H2O2, illumination timeand calcination time. The degradation of ammonia nitrogen pollution in mariculture wastewater was optimized by orthogonal experiment. According to the results, the best effect exists when the dose of catalysts was 60 mg, initial concentration of ammonia nitrogen was 10 mg/L, pH value was 9, concentration of H2O2 was 0.5 g/L, illumination time was 2.5 h, and calcination time was 1h. The removel rate of ammonia nitrogen can reach 75.78%.