Adsorption kinetics and thermodynamics of organophosphorus profenofos pesticide onto Fe/Ni bimetallic nanoparticles

Abstract

Bimetallic Fe/Ni nanoparticles were synthesized and used for the removal of profenofos organophosphorus pesticide from aqueous solution. These novel bimetallic nanoparticles (Fe/Ni) were characterized by scanning electron microscopy, energy-dispersive X-ray analysis spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The effect of the parameters of initial pesticide concentration, pH of the solution, adsorbent dosage, temperature, and contact time on adsorption was investigated. The adsorbent exhibited high efficiency for profenofos adsorption, and equilibrium was achieved in 8 min. The Langmuir, Freundlich, and Temkin isotherm models were used to determine equilibrium. The Langmuir model showed the best fit with the experimental data (R 2 = 0.9988). Pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were tested to determine absorption kinetics. The pseudo-second-order model provided the best correlation with the results (R 2 = 0.99936). The changes in the thermodynamic parameters of Gibb's free energy, enthalpy, and entropy of the adsorption process were also evaluated. Thermodynamic parameters indicate that profenofos adsorption using Fe/Ni nanoparticles is a spontaneous and endothermic process. The value of the activation energy (E a = 109.57 kJ/mol) confirms the nature of the chemisorption of profenofos onto Fe/Ni adsorbent.

Montmorillonite immobilized Fe/Ni bimetallic prepared by dry in-situ hydrogen reduction for the degradation of 4-Chlorophenlo

“…In the diffraction pattern of the catalysts, no characteristic diffraction peak of Ni was observed, proving that Ni was highly dispersed on the surface of montmorillonite and may be close to amorphous or single-layer distribution. The above results showed that the addition of Ni could effectively promote the miniaturization of Fe grains and prevent the agglomeration of Fe 47 . The surface morphology of the different montmorillonite composites was shown in Fig.…”

“…Results obviously demonstrated that the bimetals were homogeneously distributed in the Fe/Ni montmorillonite material, and montmorillonite could effectively inhibit the agglomeration of Fe/Ni particles. Uniformly distribution of Ni and Fe made active sites exposed, which facilitated the contact of target contaminants with active sites and improved the degradation of the catalyst 47 . As shown in Fig.…”

Adsorption of bentazon on CAT and CARBOPAL activated carbon: Experimental and computational study

“…Estos experimentos son los más comunes para el estudio de adsorción ya sea de compuestos orgánicos, como inorgánicos o metales [67][68][69].…”

Synthesis of a molecularly imprinted polymer on mSiO2@Fe3O4 for the selective adsorption of atrazine

“…Due to its high efficiency and easy operation, adsorption is one of the most important methods for removal of organic pollutants [5,6]. Adsorbents used in pesticide remediation from water and wastewater have been already developed [7,8]. Among the popularly used sorbents, activated carbon is the most employed one for removal of pollutants from wastewaters.…”