###### Abstract  
In the present study, new magnetic nanocomposites were successfully prepared by combustion method, characterized by X-ray diffraction, Fourier transform infrared spectroscopy, magnetic measurements, N\({}_{2}\) adsorption-desorption thermal analysis, and scanning electron microscopy, and tested as adsorbents for the removal of anionic dyes (Acid Yellow 42 and Acid Red 213) from aqueous solutions. The influence of process variables solution pH, adsorbent dose, initial dye concentration and temperature on the adsorption was evaluated. The best kinetic model that fitted with experimental data was a pseudo-second order model, and the equilibrium data were correlated by Langmuir isotherm model for the investigated dyes. Maximum removal efficiencies of 98.54% and 97.58% was obtained for Acid Yellow 42 and Acid Red 213, respectively, indicating the superior adsorption capacity of the new synthesized magnetic nanocomposites. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption process. magnetic nanocomposites; combustion synthesis; dye; adsorption Article  
Ascorrelation of Anionic Dyes from Wastewater onto Magnetic Nanocomposite Powders Synthesized by Combustion Method. of large-scale application, the incomplete mineralization of the organic compound, and the production of toxic by-products [13; 24]. In the case of biological methods, the disadvantages include the low efficiency in removing certain dyes with stable molecular structures, the appearance of sludge, and the production of harmful secondary compounds [13; 25]. Among all the decontamination methods, physical adsorption proves to be unique in removing dyes from contaminated wastewater, because it consists of a simple operation process, has a high selectivity for contaminants, results in the low production of non-toxic by-products, and has low operating costs and high efficiency. Various materials, such as activated carbon [26], zeolites [27], mesoporous silica [28], metal organic frameworks (MOF) [29], polymers [30], and by-products of agriculture [31], have been investigated as potential adsorbents for wastewater treatment. Among these materials, activated carbon (AC) has shown good adsorption performance for a wide range of pollutants, due to its porous structure and large specific surface area. However, powder-activated carbon has a major drawback: the difficulty of separating it from aqueous solutions. To overcome this problem, activated carbon-based magnetic composite powders have attracted much interest. In the recent years, magnetic nanocomposites have been proven to be highly efficient in removing dyes from wastewater because they are easy to control and can be very quickly separated from solution by applying an external magnetic field [32; 33; 34; 35]. Different synthesis methods have been used for the preparation of magnetic nanocomposites, including sol-gel [36], solvothermal [37], hydrothermal [38], pyrolysis of organometallic compounds [39], co-precipitation [40], and the combustion method [41]. Most of these methods have disadvantages as they involve several steps in the synthesis process, the reaction is difficult to control, and they involve long reaction times and toxic raw materials. On the other hand, the combustion method used in this study has proven to be a versatile, simple and safe method. Combustion synthesis is a quick and easy process that requires simple equipment, thus it can save time and energy. At the same time, the combustion method allows the efficient synthesis of a variety of nanomaterials with high yields and high surface areas [42; 43]. The aim of this study is the synthesis of a new material, which combines the adsorbent properties of activated carbon with the magnetic ones of iron oxides. This new material was further tested as an adsorbent for anionic dyes. The synthesized adsorbents were characterized in terms of structural, morphological and magnetic properties.