Visible light mediated photocatalytic anionic and cationic dyes degradation using ZnO-Fe۲O۳ nanocomposite

In this work, hydrothermal technique and precursor materials obtained from the wastes of filtration unit of gas pressure reduction station were used to create ZnO-Fe۲O۳ nanocomposite. FT-IR, FE-SEM, XRD and TEM analyzes were used to investigate the properties of the produced nanocomposite. XRD analysis showed the structure of ZnO and Fe۲O۳ without impurities. The crystal size of ZnO-Fe۲O۳ nanocomposite was determined to be about ۵۳ nm. FE-SEM images showed a nanocomposite pattern with an approximate diameter of ۵۰ nm. Finally, visual decomposition of anionic and cationic dyes under visible light was used to study the photocatalytic activity of ZnO-Fe۲O۳ nanocomposite. By exposing a metal halide lamp to light and darkness for ۶۰ minutes and ۱۵۰ minutes, respectively, it was possible to study the photocatalytic activity of the synthesized nanocomposite in removing anionic and cationic dyes from aqueous medium. In the photocatalytic degradation of anionic and cationic dyes, the following factors were considered as essential variables: pH, initial dye concentration, nanocomposite content and exposure time. In this study, the degradation percentage of anionic and cationic dyes of ZnO-Fe۲O۳ nanocomposite with a ratio of ۰.۷۵:۱ was ۹۹.۸۹ and ۹۹.۹%, respectively. The amount of band gap was calculated by Tack plot method and electrical conductivity was calculated using electrochemical impedance spectroscopy, which reduced the band gap. And the resistance increases. Due to the acceleration of charge transfer at the heterogeneous junction surface and the suppression of electron/hole pairs from recombination, the ZnO-Fe۲O۳ nanocomposite significantly increased the visible light current response.

کلیدواژه ها:

Direct Blue anionic dye ، Basic Yellow cationic dye ، Visible light ، Photocurrent ، ZnO-Fe۲O۳ nanocomposite