Jump to main content
Jump to site search

Issue 12, 2017
Previous Article Next Article

Tunable phenol remediation from wastewater using SWCNT-based, sub-nanometer porous membranes: reactive molecular dynamics simulations and DFT calculations

Author affiliations

Abstract

The importance and impact of the application of CNT membranes with sub-nanometer pores for effective water purification are marvelous. Here we demonstrate, by reactive MD simulations, that CNT membranes can efficiently reject phenol due to molecular size exclusion effects and yield high permeability of water. The water flux in armchair CNTs with a pore diameter of about 7 Å is 1.3 orders of magnitude greater than that of the zigzag counterparts, and pore chemistry plays an important role in moderating the water flux. Nanotubes with H-capped atoms on their rims lead to higher fluxes (50 times) than that of the C-passive counterpart. In nanotubes of larger diameters (8 Å), the pore size is large enough to permit phenol molecules to permeate without any restraint. A series of evidence-based investigations on the interaction nature of the systems under consideration was performed to explain the specific molecular factors as well as systematically reliable relationships for water molecules penetrating through various nanotubes. DFT calculations were also performed to evaluate the validity of the reactive potential employed here. We expect these findings to establish a basis for the design of novel energy-efficient nanotube based membranes as an economical means for the removal of organic contaminants from water, and they can be a benchmark for directing experimental efforts, which are presently restricted by the difficulty associated with creating sub-nanometer pores of a specific size for water treatments.

Graphical abstract: Tunable phenol remediation from wastewater using SWCNT-based, sub-nanometer porous membranes: reactive molecular dynamics simulations and DFT calculations

Back to tab navigation

Publication details

The article was received on 14 Dec 2016, accepted on 22 Feb 2017 and first published on 23 Feb 2017


Article type: Paper
DOI: 10.1039/C6CP08525C
Citation: Phys. Chem. Chem. Phys., 2017,19, 8388-8399
  •   Request permissions

    Tunable phenol remediation from wastewater using SWCNT-based, sub-nanometer porous membranes: reactive molecular dynamics simulations and DFT calculations

    F. Moradi, M. D. Ganji and Y. Sarrafi, Phys. Chem. Chem. Phys., 2017, 19, 8388
    DOI: 10.1039/C6CP08525C

Search articles by author

Spotlight

Advertisements