Potential organic magnetic nanoparticles from peel extract of Archidendron pauciflorum for the effective removal of cationic and anionic dyes

The adsorption of cationic (methylene blue, MB) and anionic (Congo red, CR) dyes using magnetic from Archidendron pauciflorum peel extract obtained via sonochemical synthesis (Fe 3 O 4 -AP) has been carried out. This study also compared the ability of Fe 3 O 4 -AP as an adsorbent for MB and CR through isotherm and kinetics studies. Fe 3 O 4 -AP was synthesized by the sonochemical method at a frequency of 800 kHz and characterized using FTIR, XRD, PSA, VSM and SEM-EDX The XRD diffractogram showed Fe 3 O 4 -AP with high crystallinity with a crystal size of 17.05 nm, and the particle size distributed in three groups, 2.56, 862.23, and 4855.78 nm, respectively. Meanwhile, the Ms of Fe 3 O 4 -AP was 27.71 emu/g. The SEM-EDX showed disordered morphology with Fe, O and C elemental composition. The kinetics and isotherm of MB and CR dye adsorption on Fe 3 O 4 -AP followed Ho’s kinetics model and Freundlich isotherm. The Freundlich isotherm model with adsorption capacities MB and CR on Fe 3 O 4 -AP was 16.02 and 10.24 mg/g, respectively.