In the present research, layered-MnCo 2 O 4 nanospinels have been prepared using Hibiscus rosa-sinensis extract and characterized by Fourier transforms infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), Brunauer-Emmett-Teller (BET), Barrett-Joyner-Halenda (BJH) techniques and zeta potential. The effect of the spinel nanoparticles on methyl orange and methylene blue removal from aquatic solutions were investigated through UV/Vis absorption. The influence of reaction parameters including time, mass of adsorbent, pH and the initial concentration of the dyes have been examined on sorption process. MnCo 2 O 4 nanoparticles showed excellent activity on dyes elimination from water and the removal efficiency for methyl orange and methylene blue were 93 and 96%, respectively. The adsorption kinetics revealed a pseudo-second-order rate law, revealing the chemical sorption as the rate-limiting step. The adsorption process were well-matched with the Langmuir adsorption model. The maximum adsorption capacity was 100.01 and 104.16 mgg À 1 for methyl orange and methylene blue, respectively.[a] Dr. orange and methylene blue were well agreed with Langmuir adsorption isotherm and the kinetic studies showed a pseudosecond-order process.
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