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Ehsan Salehi

Ehsan Salehi

Academic rank: Professor
ORCID: https://orcid.org/0000-0003-4409-1242
Education: PhD.
ScopusId: 25643697300
Faculty: Engineering
Address: Arak University
Phone: 086-32625020

Research

Title
Chitosan/Polyvinyl Alcohol Thin Membrane Adsorbents Modified with Zeolitic Imidazolate Framework (ZIF-8) Nanostructures: Batch Adsorption and Optimization
Type
JournalPaper
Keywords
Adsorption; Metal-organic framework; Membrane adsorbent; Dye removal; Optimization.
Year
2020
Journal Separation and Purification Technology
DOI
Researchers Ehsan Salehi ، Vahid Vatanpour ، Mohammad Khajavian

Abstract

This study presents the fabrication of zeoliticimidazolate framework (ZIF- 8)/chitosan/polyvinyl alcohol composite membrane adsorbents for the removal of malachite green dye from aqueous environment. Synthesis of the nanostructure and its incorporation in the membrane body were approved by scanning electron microscopy, dynamic light scattering, X-ray diffraction, BET and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) analyses. The optimal dye removal (84.55%) was tabulated for the membrane with 1wt% ZIF-8 in the casting dope. Afterward, batch adsorption conditions were optimized for the membrane containing 1 wt% ZIF-8 using central composite experimental design algorithm. The maximum model-predicted removal percentage was found 97.63% at optimal conditions of adsorbent mass of 0.04 g, initial dye concentration of 29.66 mg/L, pH of 6.1. Re-conducting batch adsorption experiment at the model-predicted optimized conditions approved the validity of the developed model by less than 3% uncertainty. The pseudo-second order model and the Langmuir isotherm were satisfactorily describe the kinetic and the equilibrium of the adsorption, respectively. Fundamental thermodynamic parameters, including ΔH0, ΔS0, and ΔG0 were also determined for the adsorption. The results disclosed endothermic nature, favorability, and spontaneity of the adsorption.