Synthesis, characterization and photocatalytic activities of Ag-N-codoped ZnO nanoparticles for degradation of methyl red

Abstract

ABSTRACT. Ag-N-codoped zinc oxide nanoparticles were synthesized by a one-step impregnation of Ag in N-doped ZnO nanoparticles. The morphologies and structures of the as-synthesized nanomaterials were investigated by using X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV-Vis spectrophotometric techniques. Photocatalytic degradation of methyl red dye using synthesized photocatalysts was studied under solar as well as UV irradiations. Modified zinc oxide photocatalysts showed higher photocatalytic activity compared to pure zinc oxide both under solar as well as UV irradiations. Calcined zinc oxide shows better photocatalytic activity than commercial zinc oxide under both solar and UV irradiations. Highest catalytic activity of Ag-N co-doped zinc oxide (ANZ) among the undoped, Ag-doped and N-doped photocatalysts was attributed to the lower rate of recombination of the photogenerated electrons and holes as well as its lower band gap energy. Photocatalytic degradation of methyl red dye follows pseudo first order kinetics for all the nanoparticles so-obtained.

Cr-N co-doped ZnO nanoparticles: synthesis, characterization and photocatalytic activity for degradation of thymol blue

“…As mentioned, earlier, the doped Cr and N, synergistically, enhance photocatalytic activity by extending photoabsorptions to visible region and by minimizing the electron-hole recombination. The synergistic effect of the codoped ZnO in degrading the thymol blue is also witnessed by previous reports made on AgN-codoped ZnO employed for degrading methyl red [28].…”

Kinetic and thermodynamic study of oxidative degradation of acid yellow 17 dye by Fenton-like process: Effect of HCO3−, CO32−, Cl− and SO42− on dye degradation

“…The discharge of dyes into water, depressed photosynthesis as well as respiration processes of aquatic system [3]. Hence, the treatment of water containing these hazardous pollutants is a major issue for environmental chemist [4][5][6][7]. Generally, these azo dyes are non-biodegradable in aerobic condition and convert to more toxic intermediate [8].…”

Synthesis, characterization and photocatalytic activity of Mn2O3/Al2O3/Fe2O3 nanocomposite for degradation of malachite green

“…Recent studies have shown that heterogeneous semiconductor photocatalysis can be an alternative to conventional methods for the removal of dye pollutants from water [3]. Heterogeneous photocatalytic oxidations performed with light irradiated semiconductors dispersions have been extensively investigated owing to their high efficiency to completely mineralize the harmful organic species to carbon dioxide and water [4].…”

“…When semiconductors are illuminated with an appropriate radiation source, electron/hole pairs are produced with electrons promoted to the conduction band leaving behind positive holes in the 102 valence band. The generated electron/hole pairs induce a complex series of reactions that can result in the complete degradation of organic pollutants such as dye adsorbed on the semiconductor surface [3]. Due to high photosensitivity and large band gap, TiO 2 and ZnO are known to be good photocatalysts for degradation of many organic pollutants.…”

“…Manganese binary mixtures are active catalyst for inorganic pollutant conversion [12]. 3 , respectively. The hydroxides were precipitated by concentrated sodium hydroxide at pH 12.…”