In this study, we reported the degradation of organic dyes (methyl orange, MO and methylene blue, MB) by Fe3O4@His@Ag MRC in which histidine was used as linker. The size of crystallite of MRC was calculated as 19 nm. The M-H hysteresis loop of the product indicates that it exhibits superparamagnetic property at room temperature. Catalytic studies showed that this product could catalyze the degradation of MO and MB in a reasonable time. Moreover, the product can be recycled five times by magnetic separation without major loss of its activity. Thus, Fe3O4@His@Ag MRC can be served as an effective and convenient recyclable nanocatalyst for azo dye degradation and hence as an environmental protection application too. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.