Mathematical approach to artificial neural network on methyl violet removal with magnetically coated activated carbon

Abstract

In this study, new magnetic activated carbon (Fe3 O4-AC) was synthesized from activated carbon which was obtained from the inner bark of acorn with the activation of H3 PO4 and its effectiveness in Methyl violet (MV) removal from aqueous solutions was investigated. Characterization of the samples was done by scanning electron microscopy–energy-dispersive X-ray spectroscopy, X-ray diffraction and Fourier-transform infrared spectroscopy. In MV adsorption on Fe3 O4-AC, pH (2–10), initial MV concentration (25–150 mg/L), amount of adsorbent (0.1–1.0 g), adsorption time (5–180 min) and temperature (298–318 K) adsorption parameters were investigated. The compatibility of MV and Fe3 O4-AC adsorption with Langmuir and Freundlich isotherm models was investigated, and it was determined that Langmuir isotherm which proposed single-layer adsorption, was the most compatible isotherm for adsorption at three different temperatures. The highest maximum adsorption capacity with Langmuir isotherm was obtained as 156.25 mg/g at 298 K. The pseudo-second-order kinetic model had a better fit with the best correlation to the kinetic data. Thermodynamic parameters (?G°, ?H° and ?S°) were calculated from the Van’t Hoff plot of lnKd . 1/T in order to discuss the removal mechanism of MV. Then, in MV removal process under different conditions, experimental results were compared with the artificial neural network model. © 2021 Desalination Publications. All rights reserved.