Adsorptive removal of azo dye using magnetic nanoparticles: an insight into equilibrium, kinetics and thermodynamic studies

For many reasons, magnetic iron oxide nanoparticles are highly efficient at sequestering dye from aqueous solutions, including their high external surface area, their excellent magnetic properties, their high adsorption capacity, their particle size, and the effortless magnetic separation after adsorption. Apart from these, magnetic iron oxide nanoparticles can serve as a catalyst for decomposing adsorbed contaminants and, in turn, reduce the formation of sludge in the process. At both room temperature and low temperature, the iron oxide nanoparticles have ferromagnetic properties, which can be used to separate the nanoparticles by adding a magnetic field outside of them. A chemical precipitation process was used in this work to prepare magnetic iron oxide and its capability to eliminate dyes from aqueous solution was evaluated. The influences of several investigational factors on dye removal were studied, including point of zero charge, concentration of dye and adsorbent, contact time, pH and temperature. Experimental findings revealed that the dye sequestration was quick when external adsorption was impacted. Langmuir’s isotherm and pseudo-second-order kinetics have been well supported by findings of the experiments with the maximum sorption capacity of 394.5 mg/g.