Bimetallic nanoparticles (NPs) which are comprised of two metal elements are of greater interest than monometallic ones from both scientific and technological perspectives. Bimetallic NPs generally exhibit unusual physicochemical properties different from those of the bulk material or their individual constituents and have a number of fascinating potential applications in areas such as catalysis, fuel cells, hydrogen storage, biosensing, cancer therapy, superalloys for aircraft and engine components, and drug delivery [1-3]. Catalytic applications of bimetallic NPs have been one of their most promising applications and extensively studied especially for environmental remediation [4,5]. Contamination of aqueous systems due to dyes emanated by textile, leather, and printing industries is a major environmental problem. It is estimated that about half a million tonnes of azo dyes are manufactured each year all over the world and account for nearly 50% of all dyes produced. The azo linkage is the most labile portion of an azo dye molecule and is responsible for its carcinogenicity and toxicity. Its degradation also leads to the formation of carcinogenic aromatic amines. In this study, the bimetallic NPs were successfully prepared using reduction method. The structure, composition, morphology, and magnetic behavior were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution TEM, UV-Vis spectroscopy, Brunauer-Emmett-Teller surface area, and room-temperature vibrating sample magnetometry. Investigation of the bimetallic NPs as the adsorbent for the removal of the azo dyes from the aqueous solutions is the main aim of the project. For kinetic study of dye removal, the adsorption studies were carried out for contact time, different pH values, different temperatures, and adsorbent doses. The results of these experiments were compared with the kinetic models. The results of adsorption experiments were compared with the well- known adsorption isotherms. The thermodynamic parameters were calculated at different temperatures. References [1] K. J. Carroll, et al., Chem. Mater. 22, 6291 (2010). [2] P. Lu, T. Teranishi, K. Asakura, M. Miyake, and N. Toshima, J. Phys. Chem. B 103, 9673 (1999). [3] M. L. Wu and L. B. Lai, Colloids Surf. A 244, 149 (2004). [4] N. W. Ockwig and T. M. Nenoff, Chem. Rev. 107, 4078 (2007). [5] W. Zhang, X. Quan, J. Wang, Z. Zhang and S. Chen, Chemosphere 65, 58 (2006).

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