Synthesis and application of N_doped FeNi3/TiO2 nano-photocatalyst in advanced oxidation process to remove reactive red 195 dye from aqueous medium

Abstract Dyes are one of the most dangerous chemical compounds in industrial wastewater, including textile wastewater. Reactive dyes have many applications in the textile industry. Nevertheless, due to the high solubility and stability of these dyes in water, the discharge of wastewater containing these dyes to receiving waters prevents the transmission of sunlight to aquatic environments and disrupts biological processes. The aim of this study was to synthesize N_doped FeNi3/TiO2 nano-photocatalyst and to investigate the removal efficiency of reactive red 195 dye from aqueous medium. In this study, the effect of important variables was investigated including initial concentration including pH (3-11), contact time (5 - 200 minutes), dye concentration (5 - 40 mg l-1), and nanocomposite dose (1 - 6 g l-1), in removal of reactive red 195 dye. The characteristics of the synthesized nanocomposites were also studied using BET, FTIR, FESEM, and VSM techniques. The results of this study revealed that increasing the contact time and decreasing the dye concentration enhanced the adsorption efficiency. The highest percentage of RR 195 dye adsorption was 82% after 90 minutes at the adsorbent concentration of 4 g l-1, pH=3 and the initial concentration of RR 195 of 5 mg l-1. Detection techniques also confirmed the synthesis of good quality synthesized nanocomposites. According to the results, the advanced oxidation process of N-doped FeNi3/Tio2 nano-photocatalyst had a high efficiency removal of reactive red 195 dye adsorption from aqueous medium. As a result, this method can be used effectively in the treatment of colored wastewater.