Determining Models of Adsorption Isotherm for Chromium on Functionalized Magnetic Nanoparticles

This research proposes a new methodology related to utilizing functionalized magnetite nanoparticles (MNPs) for adsorption of chromium ions. A functional chelating group is formed using Free-radical co-polymerization of N,N-dimethylacrylamide and allylamine, which is grafted onto MNPs by (3-mercaptopropyl)trimethoxysilane. FTIR, elemental analysis, thermogravimetric analysis, transmission electron microscopy, and scanning electron microscopy are employed for Characterization of the grafted MNPs. The optimal sorption pH of the metal ion was 4. The sorption capacity of the functionalized MNPs was equal to 38.61 mg/g. The chelating sorbent was reutilized for 11 sorption–desorption cycles which caused no significant change in sorption capacity. The dimensionless separation factor of R L 0.529 denotes good adsorption of Cr(VI) that is a result of the functionalized MNPs. Langmuir, Freundlich, and Redlich–Peterson models are employed for analyzing The equilibrium sorption data for Cr(VI) onto the polymeric sorbent. According to The equilibrium adsorption data it is admitted at pH 4 and 25°C that the Langmuir and Freundlich constants were 0.01 and 0.486, respectively. In the Redlich-Peterson model, g was 0.98, approving that the Langmuir isotherm is the best model.

Keywords:

Chromium , Functionalized Magnetic Nanoparticles , Adsorption isotherms