MEL zeolite nanosheet membranes for water purification: insights from molecular dynamics simulations

Seyed Soroush Mousavi Khadem, Abbasali Nasiriasayesh, Amin Hamed Mashhadzadeh*, Sajjad Habibzadeh, S. Mohammad Sajadi, Otman Abida, Muhammad Tajammal Munir, Amin Esmaeili, Navid Rabiee, Mohammad Reza Saeb, Mohammadreza Shokouhimehr*, Rajender S. Varma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

MEL-type zeolite was selected as a typical porous material to theoretically capture the purification scenario of a model landfill leachate comprising PbCl2 and CuCl2 varying the pressure (2.4-48 MPa). Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) was applied to simulate the equilibrium state (0.5 ns) and dynamics of Pb2+, Cu2+ and Cl- and water molecules (4 ns). Overall, the flux through the MEL membrane was increased by the increase of pressure. Lennard-Jones potential was used to explain non-bonded interactions between the membrane and ions as well as water molecules, in terms of values of energy and snapshots were taken from the evolution of purification phenomenon. The molecular patterns of accumulation of ions in the vicinity of zeolitic membrane were also captured as functions of the energies of the interaction between the contaminants and porous membrane. Mean square displacement (MSD) variation was indicative of the effect of pressure on dynamics of heavy metal separation; higher energies obtained at higher pressures, as reflected in alteration of van der Waals (vdW) force between ions and water molecules. The membrane revealed rejection above 70% for Pb2+, and almost 100% against Cu2+ and Cl-, respectively. Density of water remained almost 1 g cm(3), but depending on population of water molecules decreased after passage into the zeolite membrane.

Original languageEnglish
Number of pages15
Journal Journal of Nanostructure in Chemistry
DOIs
Publication statusE-pub ahead of print - 7 Jul 2021
Externally publishedYes

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