Abstract
One of the most important directions for environmental remediation is the effective removal of dyes and toxic heavy metals from water using newly fabricated nanoadsorbents. Here, magnetic Fe3O4 nanoparticles were combined with nitrogen-containing functional group polymers chitosan (CS) and polypyrrole (ppy) to synthesize a nanocomposite (polypyrrole@magnetic chitosan) useful for removing methyl orange (MO) and hexavalent chromium (Cr (VI)) from water. The physicochemical properties of the nanocomposite were determined using SEM, TEM, XRD, FT–IR, and TGA techniques. The effect of different factors on the adsorption system was studied including the contact time, pH, and the effect of co-existed ions. The kinetic study illustrated that the adsorption fit well with Langmuir isotherm. The maximum adsorption capacity of MO and Cr (VI) was found to be 95 and 105 mg/g, respectively. The reusability of the nanocomposite was studied for up to five cycles using 0.1 M NaOH as eluent with a slight decrease of adsorbent efficiency. Furthermore, the removal mechanism studied suggested the removal of MO via adsorption and Cr (VI) via chemical reduction and adsorption. This study suggests that a ppy@magnetic chitosan nanocomposite is a promising nanoadsorbent for removing MO and Cr (VI) from water.
Highlights
Introduction iationsEnvironmental degradation and the lack of clean water have become universal problems associated with the fast increase in industrial activity and social economy and should be solved to maintain a high-quality life [1,2,3]
For the study of the effectiveness of ppy@magnetic chitosan for removing methyl orange (MO) and Cr (VI), adsorbent experiments were conducted in batch mode using 100 mL bottles
V denotes the volume of solution, m denotes the mass of ppy@magnetic chitosan, and Ci and Ct represent the initial and final concentration of MO and Cr (VI) pollutants, respectively
Summary
Research Laboratory: Energy and Environment, Chemical Engineering Department, National School of Engineers, Gabes University, Gabes 6072, Tunisia. Higher Institute of Biotechnology of Sfax (ISBS), Sfax University, P.O. Box 263, Sfax 3000, Tunisia. Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt
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