Methylene Blue Adsorption by Magnesium Oxide Nanoparticles Immobilized with Chitosan (CS-MgONP): Response Surface Methodology, Isotherm, Kinetics and Thermodynamic Studies

In this research, a chitosan-immobilized magnesium oxide nanoparticle (CS-MgONP) was synthesized to evaluate it as a prospective adsorbent for a cationic Methylene Blue (MB) dye. For the synthesized adsorbent, functional groups were analyzed through Fourier transform InfraRed (FT-IR) spectroscopy. X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were used to identify the structural and morphological observations. The evaluation of process parameters such as pH (۵-۹), CS-MgONP dosage (۰.۲-۰.۶g/L), initial MB concentration (۱۰-۳۰mg/L), and temperature (۲۸۳-۳۲۳K) on MB adsorption was done at an equilibrium agitation time of ۷۰ min using Central Composite Design (CCD) of Response Surface Methodology (RSM). MB removal percentage of ۹۴.۵۱% (desirability=۰.۸۲۹) was obtained under the optimal conditions of pH=۷.۲۸, dosage=۰.۴۷g/L, initial MB concentration= ۱۹.۳۷mg/L and temperature =۳۰۹.۷۶K. The adsorption onto CS-MgONP fits well with pseudo-second-order kinetics equation and equilibrium data made the best fit with Langmuir isotherm with maximum MB uptake capacity of ۱۶۳.۸۷mg/g.

کلیدواژه ها:

Magnesium oxide nanoparticles ، Chitosan ، Dyes ، Nano-adsorbents ، Kinetics ، equilibrium