Work

Investigation of the equilibrium, thermodynamic and kinetic parameters of study of the Allura red dye efficient removal from aqueous solution by magnetic α-Fe2O3 nanoparticles and its nanocomposite with graphite powder (α-Fe2O3/G-p)

Year: 2019

Type: article

Abstract: ABSTRACT The adsorption of Allura red by magnetic α-Fe 2 O 3 nanoparticles and its nanocomposite with graphite powder(α-Fe 2 O 3 /G-p) was studied using equilibrium, kinetics and thermodynamics adsorption models. The morphological and structural impact of α-Fe 2 O 3 nanoparticles onto G-p was evaluated by using scanning electron microscopy (SEM) and wide angle X-ray diffraction (WAXD). BET model used for specific surface area analysis revealed values of 186.88 m 2 /g for α-Fe 2 O 3 nanoparticles and 349.85 m 2 /g for nanocomposite whereas BJH model was employed to evaluate the pore size and pore size distribution confirming the mesoporous texture of adsorbents. The dependence of adsorption of Allura red dye by α-Fe 2 O 3 nanoparticles and α-Fe 2 O 3 /G-p nanocomposite, on contact time, adsorbent dosage and pH was also evaluated. Adsorption equilibrium data was evaluated at different temperatures by applying Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherms linear equations, on which statistical analysis was performed, revealing the important adsorption parameters such as R L value of Langmuir model which confirms the physical adsorption phenomenon whereas 1/n factor of Freundlich model highlights the favorable interaction between adsorbate and adsorbent. Pseudo-first-order, pseudo-second-order and intra-particle diffusion models were used for kinetics data analysis. The correlation factor R 2 is greater than 0.99 for pseudo second order model values confirming the multi step nature of adsorption. The Van’t Hoff plots were plotted for obtaining the thermodynamic parameters of entropy change (ΔS), Gibb’s free energy (ΔG) and the enthalpy (ΔH). The negative values of ΔG confirm the feasible spontaneous nature of adsorption process respectively.

Source: Desalination and Water Treatment

DOI: 10.5004/dwt.2019.23288

Authors: Tanveer ul Haq Zia, Abdul Hadi Mehmood, Behisht Ara, Kashif Gul

Institutions: Sarhad University of Science and Information Technology, University of Peshawar

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $1,000