The use of starch‐modified magnetic Fe⁰ nanoparticles for naphthalene adsorption from water samples: Adsorption isotherm, kinetic and thermodynamic studies

Abstract

This study was aimed at investigating the effectiveness of starch‐modified magnetic nanoparticles for the removal of naphthalene, which is a polycyclic aromatic hydrocarbon present in the majority of water sediments, from water resources. Magnetic Fe0 nanoparticles have recently been considered because of their high efficiency for contaminant removal. In the present study, Fe0 nanoparticles were synthesized using sulfate method and starch was used as a stabilizer. The size of the Fe0 nanoparticles was measured as approximately 45 nm using X‐ray diffraction and scanning electron microscopy analyses. The removal efficiency of naphthalene from water using the nanoparticles was evaluated based on various factors including the viscosity of naphthalene dissolved in water, and operation factors such as nanoparticle dosage, contact time, initial naphthalene concentration and pH in non‐continuous reactors were optimized. The results revealed that the starch‐modified nanoparticles have high efficiency for removal of dissolved naphthalene from aqueous solution. Under the optimum conditions, more than 99% of naphthalene at a pH of 5.0 with nanoparticle dosage of 0.05 g was removed from aqueous solution in 5 min. The equilibrium adsorption data were interpreted in terms of Langmuir, Freundlich and Temkin isotherm models and the goodness of fit was inspected using linear regression analysis. Our results indicated that the Langmuir model with maximum adsorption capacity was best fitted, suggesting monolayer adsorption. Moreover, it was found that the adsorption process followed the pseudo‐second‐order kinetic model. In addition, a thermodynamic study indicated that the adsorption process of naphthalene from aqueous solution by the starch‐modified nanoparticles was spontaneous and exothermic.

Rapid ultrasound‐assisted microextraction of atorvastatin in the sample of blood plasma by nickel metal organic modified with alumina nanoparticles

“…Among them, dispersive solid-phase extraction (dSPE) with the advantages of higher extraction recovery (ER), matrix simplification, eco-friendly, costeffective, and lower organic solvent volume is considered as a favorable, promising, and green technology [24,25]. In this regard, designing a proper sorbent to reach maximum efficiency is of high current interest [26][27][28]. A variety of porous sorbent materials have been developed including nanomaterials [29][30][31], zeolites [32], carbon nanotube [33,34], porous organic polymers [35,36], and metalorganic materials (MOMs) [37,38].…”