Framework of nano metal oxides N-NiO@N-Fe3O4@N-ZnO for adsorptive removal of atrazine and bisphenol-A from wastewater: Kinetic and adsorption studies

Abstract

In this work a new framework of nano metal oxides from NiO, ZnO, and NFe3O4 nanoparticles have been synthesized and linked together via a hydrogen bonding in this form N-NiO@N-Fe3O4@N-ZnO as a simple and low cost material, this material has been characterized by using diverse techniques such as FT-IR, XRD, TGA, and TEM. The structural characterization has proved the presence of the three metal oxides, and the morphological characterization has established that the average particle size for the synthesized nanocomposite was between 30−50 nm. The newly synthesized material has implemented for the efficient remediation of atrazine (ATZ), and bisphenol A (BPA) from wastewater samples. The different controlling experimental conditions such as solution pH, contact time, adsorbent mass, and initial pollutant concentration have been investigated and optimized to obtain the maximum removal conditions. The optimum removal percent has been obtained by using 100 mg of the nanosorbent, at pH 5.0, and reaction time 80.0 min as 92 %, and 96 % for atrazine, and bisphenol-A respectively. The Adsorption kinetic has been investigated and illustrated using pseudo 1storder, pseudo 2nd order, and intraparticle diffusion models. The collected results confirmed that the reaction has been fitted with pseudo 2nd order, this kinetic model exhibited the best fit with the experimental data. Finally, the adsorption equilibrium has been established by using Langmuir, Freundlich, and Temkin isotherm models, and the adsorption has been fitted with the Langmuir adsorption isotherm more than any other adsorption model.