Reyhaneh Darvishi Harzevili - Department of Chemistry, Faculty of Science, University of Guilan, Guilan, Iran
Hadi Fallah Moafi - Department of Chemistry, Faculty of Science, University of Guilan, Guilan, Iran
Leila Shirmohammadzadeh - Department of Chemistry, Faculty of Science, University of Guilan, Guilan, Iran

Chromites as a family of normal type spinel structure have many applications in the fields rangind from applied physics and sciences to geophysics. Among the transition metal chromites with spinel-type structures, NiCr2O4 and ZnCr2O4 used as a catalyst, gas sensors, pigment, magnetic material and semiconductor [1]. The most widely used method for the synthesis of Nio.Zno.Cr204 (NZC) nanoparticles involves hydrothermal, coprecipitation and sol-gel combustion. Eosin Y (EY) is a stable dye and hase been used as a catalyst for photocatalyst degradation of some compounds. Wastewater containing EY causes environmental problems due to its stability and dark color. EY, was potentially hazardous to human health [2]. The typical preparation of NZC nanoparticles, 1.1g of NiCl2.6H20 and 0.3g of Zn(CH3COO)2.2H20 were dissolved in 10 ml of distilled water then the above solution added to 2.6g of CrCl3.6H 0 that was dissolved in distilled water. NaOH was added to solution and the pH was raised above 10. The obtained mixture was then heated at 110 °C for 3h in the oil bath and the resulting powder was calcined at 600 °C for 4 hours. Detailed characterization of the as-prepared nanoparticles was carried out by FT-IR, Xray diffraction and EDX. EDX analysis have shown among the samples for synthetic method and X-ray analysis contains the main assignments which identify the formation of NZC. Furthermore, the photocatalytic activity of NZC nanoparticles was confirmed by degradation of anionic dye Eosin-Y under vis light irradiation. The obtained NZC nanoparticles exhibit about 30% of degradation of dye.

Nio.sZno,sCr204 (NZC), Coprecipitation methode