Comparison of magnetic Fe3O4/chitosan and arginine-modified magnetic Fe3O4/chitosan nanoparticles in simultaneous multidye removal: Experimental design and multicomponent analysis

In this study, multidye biosorption of Titan yellow (TY), Fuchsine acid (FA) and Indigo carmine (IC) in ternary mixture onto magnetic Fe3O4/chitosan nanoparticles (MFe3O4/CS NPs) and arginine-modified MFe3O4/CS NPs was investigated. Simultaneous determination of TY, IC, and FA in ternary solutions was performed by principal component-wavelet neural network (PC-WNN). Characterizations of the synthesized particles were performed by scanning electron microscopy (SEM), elemental analysis (EDAX), thermo-gravimetric analysis (TGA), vibrating sample magnetometer (VSM), Fourier transform infrared (FT-IR) spectroscopy and BET surface area analysis. Result VSM indicate the saturation magnetization values of bare Fe3O4 and arginine-modified magnetic chitosan nanoparticles were about 55.00, 23.04 emu/g, respectively. Also result of BET analysis showed chitosan, MFe3O4/CSNPs, and arginine-modified are nonporous and specific surface area for arginine-modified is more than chitosan, MFe3O4/CSNPs. Response surface methodology (RSM) with Box-Behnken design was used to optimize experimental parameters (biosorbent dose, pH, and time). At optimum conditions, maximum total biosorption capacity of MFe3O4/CSNPs and arginine-modified MFe3O4/CSNPs for anionic dyes was 0.385 and 0.681 mmol g−1, respectively. Arginine-modified magnetic Fe3O4/CSNPs biosorption capacity was twice better than that of magnetic Fe3O4/CSNPs. The biosorption processes were kinetically followed by a pseudo-second order model. Fourteen isotherms were also fitted to biosorption equilibrium data.