Seyed Amin Shobeiri - Department of chemistry, Faculty of Science, Semnan University, Semnan, Iran,
Mehdi Mousavi-Kamazani - Young Researchers and Elites Club, Arak Branch, Islamic Azad University, Arak, Iran,

Ball milling method was used to prepare NiCr2O4 nanostructures via a facile and solvent-less using new set of organometallic starting reagents including Ni(Sal)2 as nickel source and [Cr(en)3]Cl3.3H2O as chrome source. Key factors controlling characteristics of final products were investigated such as ball mill time, speed of ball mill, mass ratio of ball to powder and process control agent on morphology of as-prepared NiCr2O4 nanostructures. The morphology and microstructure of as-synthesized products were characterized by XRD, SEM, FTIR and EDX. Finally, the photocatalytic activity of nickel chromite nanostructures were studied by performing the photocatalytic degradation of an azo dye (Acid Red 88) at different irradiation time. Accordingly, after 150 min of irradiation on the degradation of the azo dye the results indicated that significant amount of the dye was degraded. The pseudo-first-order kinetic models were used and the rate constants were evaluated with pseudo first order rate constants of 2.47 *10-2 min-1. The effects of particle size and morphology on the photocatalytic activity were evaluated as well.

Nickel chromite; Ball mill; Photocatalyst; Organometallic; Azo dye.