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Alinia Z, Akbarzadeh H, Mohammadi Zonoz F, Tayebee R. Enhancing the seawater desalination performance of multilayer reduced graphene oxide membranes by introducing in-plane nanopores: a molecular dynamics simulation study. Phys Chem Chem Phys 2024; 26:9722-9732. [PMID: 38470395 DOI: 10.1039/d3cp02967k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024]
Abstract
In this study, using MD simulation, the effect of creating in-plane nanopores in a reduced graphene oxide (rGO) membrane and the formation of a reduced nanoporous graphene oxide (rNPGO) membrane is proposed to increase salt rejection and water flux. To this end, the desalination performance of r1NPGO, r2NPGO and r4NPGO membranes, which have 1, 2 and 4 pore(s), respectively, with a diameter of 0.9 nm and the r1NPGO-3 nm membrane, which has 1 pore with an approximate diameter of 3.0 nm, was investigated and compared from a molecular point of view. The simulation results show that in the rNPGO membranes, by increasing the number of pores from 1 to 4, water flux increases by ∼6 times compared to the rGO membrane. Meanwhile, upon increasing the pore size from 0.9 to 3.0 nm, water flux is enhanced by ∼16 times compared to the rGO membrane. The simulation results also demonstrate that the rGO membrane has two paths for water penetration, which are called the interlayer pathway and in-slit pathway. Moreover, pores in the rNPGO membranes provide another additional path for water transfer by shortening the lateral size of the membranes. This path is referred to as the in-pore pathway. By increasing the size of the pore in the r1NPGO-3 nm membrane, the contribution of the in-pore pathway increases and plays an important role. Furthermore, the simulation results show that in all rGO and rNPGO membranes, the interlayer space acts as a barrier for ions. Therefore, complete salt rejection is observed. Interestingly, by increasing the pore size in the r1NPGO-3 nm membrane, this membrane still maintains complete salt rejection. The observed phenomenon can be a result of very high water flux in this membrane. By increasing water flux, the presence of water molecules around Na+ and Cl- ions decreases. As a result, the formation of Na+Cl- ionic clusters is strengthened in such a way that these clusters do not have the ability to pass through large pores of 3.0 nm.
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Affiliation(s)
- Z Alinia
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
| | - H Akbarzadeh
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
- Department of Physical Chemistry, Faculty of Chemistry, Kharazmi University, Tehran 15719-14911, Iran
| | - F Mohammadi Zonoz
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
| | - R Tayebee
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, Sabzevar 96179-76487, Iran.
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2
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Ibrahim Q, Akbarzadeh R, Gharbia SS, Ndungu PG. Design of Multi-Layer Graphene Membrane with Descending Pore Size for 100% Water Desalination by Simulation Using ReaxFF. MEMBRANES 2022; 12:1038. [PMID: 36363593 PMCID: PMC9696490 DOI: 10.3390/membranes12111038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 10/01/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
The performance of a desalination membrane depends on a specific pore size suitable for both water permeability and salt rejection. To increase membrane permeability, the applied pressure should be increased, which creates the need to improve membrane stability. In this research article, a molecular dynamics (MD) simulation was performed using ReaxFF module from Amsterdam Modeling suite (AMS) software to simulate water desalination efficiency using a single and multi-layer graphene membrane. The graphene membrane with different pore sizes and a multi-layer graphene membrane with descending pore size in each layer were designed and studied under different pressures. The stability of the membrane was checked using Material Studio 2019 by studying the dynamics summary. The single-layer graphene membrane was evaluated under pressures ranging from 100 to 500 MPa, with the salt rejection ranging from 95% to 82% with a water permeability of 0.347 × 10-9 to 2.94 × 10-9 (mm.g.cm-2s-1.bar-1), respectively. Almost 100% salt rejection was achieved for the multi-layer graphene membrane. This study successfully demonstrated the design and optimization of graphene membrane performance without functionalization.
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Affiliation(s)
- Qusai Ibrahim
- Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg 2006, South Africa
| | - Rokhsareh Akbarzadeh
- Energy, Sensors and Multifunctional Nanomaterials Research Group, Department of Chemical Sciences, Faculty of Science, University of Johannesburg, Doornfontein 2028, South Africa
- Department of Physics, Faculty of Science, University of South Bohemia, 370 05 České Budějovice, Czech Republic
| | - Salem S. Gharbia
- Centre for Environmental Research Innovation and Sustainability CERIS, Department of Environmental Science, Atlantic Technological University, F91 YW50 Sligo, Ireland
| | - Patrick Gathura Ndungu
- Energy, Sensors and Multifunctional Nanomaterials Research Group, Department of Chemical Sciences, Faculty of Science, University of Johannesburg, Doornfontein 2028, South Africa
- Department of Chemistry, University of Pretoria, Pretoria 0028, South Africa
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3
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Chen S, Ding J, Li Q, He D, Liu Y, Wang L, Lyu Q, Wang M. Control one-dimensional length of rectangular pore on graphene membrane for better desalination performance. NANOTECHNOLOGY 2022; 33:245705. [PMID: 35263720 DOI: 10.1088/1361-6528/ac5c15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
At present, there is a general contradiction between permeability and selectivity of reverse osmosis (RO) membranes for desalination; a membrane with higher water permeability will give a lower salt rejection or selectivity, and vice versa. In this work, single-layer nanoporous graphene is used as RO membrane to investigate the effects of pore shape to reduce this contradiction by molecular dynamics simulations. Two kinds of pores (round and rectangular pores) with different sizes are simulated. For round pore, although the water permeability increases with the increase of the pore size, the salt rejection rate drops rapidly. For rectangular pore, reasonable designed pore structure can achieve improved water permeability and high salt rejection of graphene membrane by keeping one-dimensional length (i.e. the width) of the pore less than the size of the hydrated ions and increasing the other dimensional length. The restriction of one dimension can prevent the passage of hydrated ions through the pore effectively. This 'one-dimensional restriction' provides a simple strategy for designing RO membrane with variable pore structures to obtain a better desalination performance.
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Affiliation(s)
- Shenghui Chen
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Jiaqi Ding
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Quanjiang Li
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Di He
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Yanli Liu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Li Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - Qiang Lyu
- School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, People's Republic of China
| | - Meishan Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
- School of Integrated Circuits, Ludong University, Yantai 264025, People's Republic of China
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4
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The electronic properties and water desalination performance of a photocatalytic TiO 2/MoS 2 nanocomposites bilayer membrane: a molecular dynamic simulation. J Mol Model 2022; 28:61. [PMID: 35171351 DOI: 10.1007/s00894-022-05053-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 02/10/2022] [Indexed: 10/19/2022]
Abstract
Due to the rapid depletion of water resources, more interest is paid for the efficient desalination process in recent years. MoS2 membrane aroused attention due to its high mechanical stability and electronic properties, which can sustain extra-large strains. In this study, the electronic properties and water desalination performance of TiO2/MoS2-hexagonal, and TiO2/MoS2-rhombohedral nanocomposites bilayer membranes were studied and simulated for the first time. The effect of TiO2 in the performance of MoS2 was observed in water desalination under the defined applied pressure ranging from 50 to 250 MPa with a 6.4 Å pore diameter. The membrane structure is created and optimized. The energy minimized for TiO2 from - 19,596.4282 kcal/mol for the initial structure to - 19,605.1611 kcal/mol for the final structure. For TiO2/MoS2-hexagonal, the energy minimized from - 4955.54271 eV) to - 4955.62091 eV and TiO2/MoS2-rhombohedral from - 6042.26925 eV to - 6046.91835 eV. A molecular dynamic (MD) simulation was performed using Material Studio 2019 to study the electronic properties under 0-1 eV electric field using the CASTEP code. The results showed a better photocatalytic performance under the external electric field. The effect of external electric field significantly intensifies absorption in the visible range and achieved a high photocatalytic activity on TiO2/MoS2. TiO2, TiO2/MoS2-hexagonal and TiO2/MoS2-rhombohedral nanocomposites bilayer membranes are simulated and evaluated for the water desalination using ReaxFF software. Both MoS2 phases with TiO2 have achieved a high salt rejection up to 97% (P-value = 0.0036, R2 = 0.958), while TiO2/MoS2-rhombohedral achieved the highest permeability (6.0*10-8 mm g cm-2 s-1 bar-1) (P-value = 0.000296, R2 = 0.972) under 250 MPa applied pressure.
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5
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Rajasekhar reddy P, Gogoi A, Anki Reddy K. Effect of oxygen-containing functional groups of layered graphene oxide membrane on the removal of amoxicillin: a molecular dynamics study. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2021.2000978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- P. Rajasekhar reddy
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Assam, India
| | - Abhijit Gogoi
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam, India
| | - K. Anki Reddy
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Assam, India
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Barabash M, Gibby WAT, Guardiani C, Luchinsky DG, Luan B, Smolyanitsky A, McClintock PVE. Field-Dependent Dehydration and Optimal Ionic Escape Paths for C 2N Membranes. J Phys Chem B 2021; 125:7044-7059. [PMID: 34115497 PMCID: PMC8279548 DOI: 10.1021/acs.jpcb.1c03255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 05/29/2021] [Indexed: 11/28/2022]
Abstract
Most analytic theories describing electrostatically driven ion transport through water-filled nanopores assume that the corresponding permeation barriers are bias-independent. While this assumption may hold for sufficiently wide pores under infinitely small bias, transport through subnanometer pores under finite bias is difficult to interpret analytically. Given recent advances in subnanometer pore fabrication and the rapid progress in detailed computer simulations, it is important to identify and understand the specific field-induced phenomena arising during ion transport. Here we consider an atomistic model of electrostatically driven ion permeation through subnanoporous C2N membranes. We analyze probability distributions of ionic escape trajectories and show that the optimal escape path switches between two different configurations depending on the bias magnitude. We identify two distinct mechanisms contributing to field-induced changes in transport-opposing barriers: a weak one arising from field-induced ion dehydration and a strong one due to the field-induced asymmetry of the hydration shells. The simulated current-voltage characteristics are compared with the solution of the 1D Nernst-Planck model. Finally, we show that the deviation of simulated currents from analytic estimates for large fields is consistent with the field-induced barriers and the observed changes in the optimal ion escape path.
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Affiliation(s)
| | - William A. T. Gibby
- Department
of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom
| | - Carlo Guardiani
- Department
of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom
- Department
of Mechanical and Aerospace Engineering, Sapienza University, 00184 Rome, Italy
| | - Dmitry G. Luchinsky
- Department
of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom
- Ames
Research Center, KBR, Inc., Moffett Field, California 94035, United States
| | - Binquan Luan
- Computational
Biological Center, IBM Thomas J. Watson
Research, Yorktown
Heights, New York 10598, United States
| | - Alex Smolyanitsky
- Applied
Chemicals and Materials Division, National
Institute of Standards and Technology, Boulder, Colorado 80305, United States
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Chen C, Huang F, Jia L, Zhang L, Chen E, Liang L, Kong Z, Wang X, Zhang W, Shen JW. Molecular insights into desalination performance of lamellar graphene membranes: Significant of hydrophobicity and interlayer spacing. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116024] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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8
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Hong TZX, You L, Dahanayaka M, Law AWK, Zhou K. Influence of Substitutional Defects in ZIF-8 Membranes on Reverse Osmosis Desalination: A Molecular Dynamics Study. Molecules 2021; 26:molecules26113392. [PMID: 34205198 PMCID: PMC8200035 DOI: 10.3390/molecules26113392] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 05/17/2021] [Accepted: 05/19/2021] [Indexed: 11/17/2022] Open
Abstract
In this study, molecular dynamics simulation is used to investigate the effects of water-based substitutional defects in zeolitic imidazolate frameworks (ZIF)-8 membranes on their reverse osmosis (RO) desalination performance. ZIF-8 unit cells containing up to three defect sites are used to construct the membranes. These substitutional defects can either be Zn defects or linker defects. The RO desalination performance of the membranes is assessed in terms of the water flux and ion rejection rate. The effects of defects on the interactions between the ZIF-8 membranes and NaCl are investigated and explained with respect to the radial distribution function (RDF) and ion density distribution. The results show that ion adsorption on the membranes occurs at either the nitrogen atoms or the defect sites. Complete NaCl rejection can be achieved by introducing defects to change the size of the pores. It has also been discovered that the presence of linker defects increases membrane hydrophilicity. Overall, molecular dynamics simulations have been used in this study to show that water-based substitutional defects in a ZIF-8 structure reduce the water flux and influence its hydrophilicity and ion adsorption performance, which is useful in predicting the type and number of defect sites per unit cell required for RO applications. Of the seven ZIF-8 structures tested, pristine ZIF-8 exhibits the best RO desalination performance.
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Affiliation(s)
- Terence Zhi Xiang Hong
- Environmental Process Modeling Centre, Nanyang Environment and Water Research Institute, 1 Cleantech Loop, Singapore 637141, Singapore; (T.Z.X.H.); (M.D.); (A.W.-K.L.)
- Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
| | - Liming You
- Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Madhavi Dahanayaka
- Environmental Process Modeling Centre, Nanyang Environment and Water Research Institute, 1 Cleantech Loop, Singapore 637141, Singapore; (T.Z.X.H.); (M.D.); (A.W.-K.L.)
- Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
| | - Adrian Wing-Keung Law
- Environmental Process Modeling Centre, Nanyang Environment and Water Research Institute, 1 Cleantech Loop, Singapore 637141, Singapore; (T.Z.X.H.); (M.D.); (A.W.-K.L.)
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Kun Zhou
- Environmental Process Modeling Centre, Nanyang Environment and Water Research Institute, 1 Cleantech Loop, Singapore 637141, Singapore; (T.Z.X.H.); (M.D.); (A.W.-K.L.)
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
- Correspondence: ; Tel.: +65-6790-5499; Fax: +65-6792-4062
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9
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Chen E, Jia L, Chen C, Huang F, Zhang L. Understanding the transport mechanism of seawater through FMOF-1 and its derivative via molecular dynamics simulation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115209] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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10
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Gogoi A, Anki Reddy K, Senthilmurugan S, Kumar Mondal P. Dehydration of acetic acid using layered graphene oxide (GO) membrane through forward osmosis (FO) process: a molecular dynamics study. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1849684] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Abhijit Gogoi
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - K. Anki Reddy
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - S. Senthilmurugan
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Pranab Kumar Mondal
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
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11
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Ibrahim Q, Akbarzadeh R. A photocatalytic TiO 2/graphene bilayer membrane design for water desalination: a molecular dynamic simulation. J Mol Model 2020; 26:165. [PMID: 32500208 DOI: 10.1007/s00894-020-04422-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 05/12/2020] [Indexed: 11/29/2022]
Abstract
The research about finding the effective membrane material is in progress; however, there are pros and cons for each material. Graphene membrane is a single layer of atoms in a two-dimensional hexagonal lattice which achieved high performance in water purification field. Addition of TiO2 to the graphene membrane has been studied for the membrane modifications due to its high stability and photocatalytic performance. In this study, graphene/TiO2 bilayer nanocomposite membrane has been simulated to enhance the mechanical and electronic properties of graphene membrane. Anatase TiO2 (A-TiO2), rutile TiO2 (R-TiO2), and their composite with graphene (G) have been simulated to evaluate the stability of the nanocomposite bilayers in water desalination for higher salt rejection percentage and water permeation. The membrane structure has been created and optimized using the geometry optimization task. The simulation of electronic and mechanical properties has been done by using Material Studio 2019. TiO2 consisting rutile and anatase phases showed a band gap of 2.248 eV, which was reduced to 1.175 eV in combination with graphene. The bilayer composite of TiO2 and graphene achieved higher membrane stability, and the salt rejection was 98% under applied pressure of 100 MPa. The graphene/TiO2 bilayer nanocomposite membranes have been evaluated by simulation for water desalination process using molecular dynamics by ReaxFF software. In comparison with a graphene membrane, the results showed an increment in salt rejection and water permeability under different applied pressure.
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Affiliation(s)
- Qusai Ibrahim
- Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg, 2006, South Africa
| | - Rokhsareh Akbarzadeh
- Department of Chemical Sciences, Faculty of Science, University of Johannesburg, Doornfontein, 2028, South Africa.
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Gogoi A, Anki Reddy K, Mondal PK. Influence of the presence of cations on the water and salt dynamics inside layered graphene oxide (GO) membranes. NANOSCALE 2020; 12:7273-7283. [PMID: 32196024 DOI: 10.1039/c9nr09288a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although over the past few years, graphene oxide (GO) has emerged as a promising membrane material, the applicability of layered GO membranes in water purification/seawater desalination is still a challenging issue because of the undesirable swelling of GO laminates in the aqueous environment. One of the ways to tune the interlayer spacing and to arrest the undesirable swelling of layered GO membranes in the aqueous environment is to intercalate the interlayer spacing of the GO laminates with cations. Although the cation intercalation imparts stabilization to GO laminates in the aqueous environment, their effect on the performance of the membrane is yet to be addressed in detail. In the present study we have investigated the effect of cation intercalation on the performance of layered GO membranes using molecular dynamics simulation. For the same interlayer spacing, the cation intercalated layered GO membranes have a higher water flux as compared to the corresponding pristine layered GO membranes. In the presence of the cations, the water molecules inside the interlayer gallery get more compactly packed. The presence of the cations also increases the stability of the hydrogen bond network among the water molecules inside the membrane. This can be attributed to slow water reorientation dynamics inside the interlayer gallery in the presence of the cations. The synergistic effect of all these changes is that the water permeability through the cation intercalated layered GO membranes is higher as compared to that through the corresponding pristine layered GO membranes. On the other hand, the intercalation of the cations (K+, Mg2+) leads to higher rejection of Na+ ions whereas the rejection of Cl- ions slightly decreases.
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Affiliation(s)
- Abhijit Gogoi
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam, India
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13
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Zhang J, Chen C, Pan J, Zhang L, Liang L, Kong Z, Wang X, Zhang W, Shen JW. Atomistic insights into the separation mechanism of multilayer graphene membranes for water desalination. Phys Chem Chem Phys 2020; 22:7224-7233. [PMID: 32207513 DOI: 10.1039/d0cp00071j] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Graphene-based membranes have been extensively explored owing to their excellent separation properties. In this paper, multiple factors regarding desalination performance were investigated by molecular dynamics (MD) simulations. These factors include the interlayer spacing distance (H), the gap width (dG), offset (O), and the number of gaps and layers in a multilayer graphene membrane (MGM). It is found that salt rejection is influenced significantly by the interlayer spacing distance owing to the largest free energy between ions and graphene sheets as well as the relatively larger size of the hydration layer around the ions. The optimal desalting parameter (dG = 1 nm, H = 0.8 nm) was selected; MGM systems based on the optimized parameter exhibited excellent salt rejection for NaCl, MgCl2 and CaCl2 solutions. These results can provide some ideas for the future design of graphene-based membranes.
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Affiliation(s)
- Jing Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Chen Chen
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Jianuan Pan
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Li Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Lijun Liang
- College of Life Information Science and Instrument Engineering, Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China
| | - Zhe Kong
- College of Material & Environmental Engineering Science Hangzhou Dianzi University, Hangzhou, 310018, People's Republic of China
| | - Xinping Wang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Wei Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, People's Republic of China.
| | - Jia-Wei Shen
- School of Medicine, Hangzhou Normal University, Hangzhou 310016, People's Republic of China.
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14
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Gogoi A, Koneru A, Anki Reddy K. Effect of graphene oxide (GO) nanosheet sizes, pinhole defects and non-ideal lamellar stacking on the performance of layered GO membranes: an atomistic investigation. NANOSCALE ADVANCES 2019; 1:3023-3035. [PMID: 36133605 PMCID: PMC9419195 DOI: 10.1039/c9na00235a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 05/18/2019] [Indexed: 05/10/2023]
Abstract
The effect of non-idealities, namely pinhole defects and non-ideal lamellar stacking of nanosheets, on the performance of size-differentiated graphene oxide (GO) laminates is investigated using equilibrium molecular dynamics (MD) simulations. With the increase in sizes of the constituent GO nanosheets the water permeability of the layered GO membranes decreases and salt rejection increases. But with the inclusion of non-idealities the difference in water permeability between these membranes substantially reduced. The pinholes on the GO nanosheets provide shorter routes for trans-sheet flow, thereby increasing the water permeability of the membranes. The non-ideal stacking of the nanosheets without pinhole defects results in slight reduction in water permeability because of blockage of permeation pathways inside the membranes. However, with pinhole defects non-ideal stacking becomes favorable for water permeation through the layered GO membranes; as this time the non-ideal stacking leads to formation of voids inside the membranes, which act as routes for shorter permeation pathways. The effect of these non-idealities is more significant for layered GO membranes composed of large GO nanosheets. Although the water permeability through the layered GO membrane is greatly enhanced because of these non-idealities (about 10 times), the corresponding variation in the salt rejection is very low (<2%).
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Affiliation(s)
- Abhijit Gogoi
- Department of Mechanical Engineering, Indian Institute of Technology Guwahati Assam India
| | - Aditya Koneru
- Department of Chemical Engineering, Indian Institute of Technology Guwahati Assam India +91 361 2582291 +91 361 258 3532
| | - K Anki Reddy
- Department of Chemical Engineering, Indian Institute of Technology Guwahati Assam India +91 361 2582291 +91 361 258 3532
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15
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Köhler MH, Bordin JR, Barbosa MC. Ion flocculation in water: From bulk to nanoporous membrane desalination. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.077] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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16
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First-principles modeling of water permeation through periodically porous graphene derivatives. J Colloid Interface Sci 2019; 538:367-376. [DOI: 10.1016/j.jcis.2018.11.106] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 11/27/2018] [Accepted: 11/28/2018] [Indexed: 01/24/2023]
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17
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Wang S, Dai S, Jiang DE. Entropic selectivity in air separation via a bilayer nanoporous graphene membrane. Phys Chem Chem Phys 2019; 21:16310-16315. [DOI: 10.1039/c9cp02670c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations show that controlling the pore size and the pore shape via the bilayer nanoporous graphene membrane provides a novel way to enhance entropic selectivity for air separation via tumbling motion of the oxygen molecule.
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Affiliation(s)
- Song Wang
- Department of Chemistry
- University of California
- Riverside
- USA
| | - Sheng Dai
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
- Department of Chemistry
| | - De-en Jiang
- Department of Chemistry
- University of California
- Riverside
- USA
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Kargar M, Khashei Varnamkhasti F, Lohrasebi A. Influence of electric fields on the efficiency of multilayer graphene membrane. J Mol Model 2018; 24:241. [DOI: 10.1007/s00894-018-3774-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 08/01/2018] [Indexed: 11/28/2022]
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