New simple route for the preparation of nanosized nickel tungstate with the aid of carbohydrates and investigation its photocatalytic application

摘要

Pure nickel tungstate (NiWO_4) nanoparticles were prepared via a new simple route by using nickel (Ⅱ) nitrate hexahydrate and Na_2WO_4·2H_2O in water. Capping agents are frequently used in colloidal synthesis to inhibit nanoparticle overgrowth and aggregation as well as to control the structural characteristics of the resulted nanoparticles in a precise manner; therefore, glucose, galactose and fructose were applied as capping agents. Besides, the effect of glucose, galactose and fructose on the morphology and size of final products were investigated by SEM analysis. According to the vibrating sample magnetometer, NiWO_4 nanoparticles indicated a ferromagnetic behavior at room temperature. To evaluate the catalytic properties of nanocrystalline NiWO_4, the photocatalytic degradations of methyl orange under ultraviolet light irradiation were carried out. The structural, morphological, magnetic, and optical properties of as-obtained products were characterized by techniques such as XRD, SEM, EDX and UV-Vis spectroscopy.