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Synthesis and application of modified magnetic nanoparticles for removal of Cyanide from aqueous solutions Cyanide is one of the major Environmental pollutants in industrial wastewater. Entrance of it to existence environmental contains very health hazardous. The cyanide can be removed from aqueous solutions in many ways, but most of these methods are expensive. In the present study, novel magnetic nanoparticle modified with a polydentate ligand is used to remove cyanide. The procedure is efficient and cost-effective. In this study, novel magnetic nanoparticle (Fe3O4-SiO2 –Met) is used to remove cyanide. Various parameters affecting the removal rate such as pH (9-11), the amount of absorbent (0.01, 0.03, 0.05gr) and contact time (4-12 hr) were evaluated. Data from the experiment were analyzed with a mathematical model of the smallest sum of squares. The relationship between time and pH value on the removal of cyanide are linear. Nevertheless, the amount of the adsorbent and time are effective. Absorbent weight is increased from 0.01 to 0.05 g and removal efficiency reaches from 20 % to 60%. With increasing contact time from 4 to 12 hours removal efficiency reaches from 30 % to 55%. The finding of this research is introducing modified nanoparticles Fe3O4-SiO2 –Met as an adsorbent for removing cyanide