Abstract
Herein, a magnetically separable Fe3O4 decorated chitosan was facilely synthesized, systematically characterized, and subsequently employed as a versatile adsorbing material for the adsorption of malachite green and methylene blue dyes. The prepared adsorbent was characteristically examined through Fourier transform infra-red microscopy, scanning electron microscopy with energy-dispersive X-ray analysis, transmission electron microscopy, X-ray diffraction, Brunauere-Emmette-Teller surface area analysis, thermogravimetric analysis, and vibrating-sample magnetometry techniques. The optimum process parameters for MB were observed to be 180 min of contact time, pH 7, and 1.2 g/L of adsorbent dose, and 210 min of contact time, pH 7, and adsorbent dose of 2 g/L was found to be for MG. The time-dependent experimental data were analyzed with different kinetic models, and pseudo-IInd-order was provided the best fit for the adsorption of both the dyes with a high value of the regression coefficient. The adsorption equilibrium data of both the dyes was best explained by Langmuir isotherm, and the maximum sorption capacity of MG and MB was found to be 55.86 and 76.34 mg/g, respectively. Thermodynamic analysis declared that the adsorption of MG and MB onto the Fe3O4 decorated chitosan was endothermic and spontaneous. Moreover, the adsorbent presented good reusability up to three successive ad-/de-sorption cycles, indicating that Fe3O4 decorated chitosan is a promising applicant for treating dye-containing wastewater.
Highlights
Water lack is one of the most severe worries that our world is confronting nowadays (Franco et al 2019)
The morphology of magnetized chitosan (MChi) nanocomposite was characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) observations
The present research emphasizes on the adsorption potential of magnetized chitosan (MChi) towards the removal of cationic malachite green (MG) and methylene blue (MB) dyes from aqueous media
Summary
Water lack is one of the most severe worries that our world is confronting nowadays (Franco et al 2019). Nasar 2015, 2019; Ippolito and Fait 2019; Quesada et al 2019; Jain et al 2019, 2020; Agarwal et al 2020) Among these contaminants, the discharge of dyeing sewage from various industries have triggered visual severe water pollution and reduces the water transparency due to extremely high color strength, and leading to a corresponding rise in the concentration of organic matter in water bodies. The discharge of dyeing sewage from various industries have triggered visual severe water pollution and reduces the water transparency due to extremely high color strength, and leading to a corresponding rise in the concentration of organic matter in water bodies It restrains the photosynthesis activity and ends up interfering with aquatic biological processes and imparting enduring potential harm to the ecosphere and humans as well (Jafari et al 2015; Shakoor and Nasar 2016; Nasar and Mashkoor 2019; Kang et al.2020). The techniques for the treatment of dyes-laden effluent include photocatalytic degradation, electrochemical treatment, biological method, membrane separation, adsorption, and so on
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