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Natural organic materials, principally humic acids cause serious problems in water treatment plants due to combination with chlorine and the formation of carcinogenic disinfection by-products. In the present study, the Fe 3 O 4 @L-arginine magnetic nanoparticle was synthesised and used to adsorbhumic acid (HA) from the aqueous solution. Fe 3 O 4 @L-arginine nanoparticles were prepared withthe co-precipitation method and characterised by FE-SEM, FTIR, XRD, and zeta potential analysis. The effect of different parameters on the HA removal by Fe 3 O 4 @L-arginine was investigated. The results showed that by increasing the adsorbent dose, contact time and temperature, the efficiency of HA removal increased, but by increasing theinitial concentration of HA, ionic strength, and pH, the efficiency of HA elimination decreased. Under optimal conditions, the highest HA removal efficiency in 0.5 g/L and 2 g/L adsorbent doses was found to be 67.23% and 96.4%, respectively. Also, the study of isotherm and kinetic of adsorption showed that the adsorption of HA on Fe 3 O 4 @L-arginine followed Langmuir isotherm and pseudo-second-order kinetic.Adsorption experiments demonstrated that Fe 3 O 4 @L-arginine as an effective and reusable adsorbent has a good capacity for the removal of HA from aqueous solution.

Removal of humic acid from aqueous solution by Fe 3 O 4 @L-arginine magnetic nanoparticle: kinetic and equilibrium studies