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Reactive Dye Adsorption from Aqueous Solution on HPEI-Modified Fe3O4 Nanoparticle as a Superadsorbent: Characterization, Modeling, and Optimization

Dalvand, Arash, Khoobi, Mehdi, Nabizadeh, Ramin, Ganjali, Mohammad Reza, Gholibegloo, Elham, Mahvi, Amir Hossein
Journal of polymers and the environment 2018 v.26 no.8 pp. 3470-3483
Fourier transform infrared spectroscopy, adsorbents, adsorption, aqueous solutions, ionic strength, iron oxides, magnetism, nanoparticles, pH, polyethyleneimine, response surface methodology, scanning electron microscopy, sorption isotherms, statistical models, transmission electron microscopy, zeta potential
In this work, the optimum condition for the adsorption of Reactive Blue 19 dye onto Fe₃O₄ functionalized with hyperbranched polyethylenimine (Fe@HPEI) was determined using response surface methodology. The properties of synthesized magnetic Fe@HPEI nanoparticles were ascertained using FTIR, SEM, TEM, VSM and zeta potential measurement. The experimental adsorption data indicating the positive effect of adsorbent dose and contact time, and the negative effect of pH, initial dye concentration and ionic strength on dye adsorption. At optimal condition; pH 3.4, contact time 25 min, adsorbent dose 0.4 g/L and initial dye concentration 113 mg/L, Fe@HPEI nanoparticles removed dye up to 99.27%. The maximum experimental dye adsorption was near to the predicted value of 100%, which confirmed the reliability of the selected statistical model. The dye adsorption data were fitted well to Langmuir isotherm and pseudo-second-order kinetic, and the maximum adsorption capacity was 500 mg/g. Totally, Fe@HPEI as an effective superadsorbent can be repeatedly utilized for the adsorption of dye from the aqueous environment.