Ultrafast ionic and molecular sieving through graphene oxide based composite membranes

Chandio, Imamdin; Janjhi, Farooque Ahmed; Memon, Ayaz Ali; Memon, Shahabuddin; Ali, Zubair; Thebo, Khalid Hussain; Pirzado, Azhar Ali Ayaz; Hakro, Ayaz Ali; Khan, Waheed S.

doi:10.1016/j.desal.2020.114848

Cited by 80 publications

(39 citation statements)

References 42 publications

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“…Additionally, we evaluated the desalination properties of both pristine GO and PGO membranes to measure the different salt ions such as NaCl, MgCl 2 , Ni(NO 3 ) 2 , and Pb(NO 3 ) 2 from water at pressure 0.95 bar as shown in Figure a,b. The 280 nm-thick pristine GO membrane shows ∼65% rejection for large ions such as Ni(NO 3 ) 2 and Pb(NO 3 ) 2 , as reported in the literature . Similarly, such membrane also shows very less rejection (∼35%) for NaCl ions due to the smaller ion size, as shown in Figure a, while as-prepared PGO membranes with almost similar thickness exhibit better rejection: ∼93 and ∼95% for Ni 2+ and Pb 2+ salt ions, respectively (Figure b).…”

Section: Separation Performance Of Membranesmentioning

confidence: 81%

Functionalized Graphene Oxide-Based Lamellar Membranes with Tunable Nanochannels for Ionic and Molecular Separation

et al. 2022

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Graphene oxide (GO)-based membranes with tunable microstructure and controlled nanochannels have attracted an increasing interest for various applications in wastewater treatment, desalination, gas separation, organic nanofiltration, etc. However, they showed limited use in water desalination due to their lower stability and separation efficiency. In this work, a class of two-dimensional (2D) GO lamellar membranes have been prepared with controlled pores for efficient and fast separation of ions and dye molecules. The GO membranes are fucntionalized with a star-like 6-armed poly(ethylene oxide) using the simple amidation route under mild conditions. The as-prepared covalently cross-linked networks are chemically steady in aqueous medium and show remarkable selectivity (∼100%) for several probe molecules and 10–100 higher permeance than those of the reported GO-based membranes. Further, such membranes are also used for salt separation and show more than 80% rejection for Pb 2+ and Ni 2+ salts. Moreover, a 1360 nm-thick membrane shows >99% rejection for NaCl with a good water permeance of up to 120 L m –2 h –1 bar –1 . Additionally, these membranes are stable for more than 20 days under different conditions.

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Section: Separation Performance Of Membranesmentioning

confidence: 81%

Functionalized Graphene Oxide-Based Lamellar Membranes with Tunable Nanochannels for Ionic and Molecular Separation

et al. 2022

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“…In a study, GO was functionalized with ginger plant extractive, and the membranes showcased a water permeance almost 15 times as that of pristine GO (around ∼420 ± 10 L m –2 h –1 bar –1 ) and varied the permeation performance with the thickness of the membrane . A work synthesized membranes made of a unique kind of GO based composites with a relatively high d -spacing . GO was reduced and also modified using cross-linkers like serine amino acid, forming a cGO/SAA membrane.…”

Section: Class 1: Laminar Membranesmentioning

confidence: 99%

Structure Dependent Water Transport in Membranes Based on Two-Dimensional Materials

Bakshi

Bustamante

Sui

et al. 2021

Ind. Eng. Chem. Res.

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The upsurge in population and industrialization has instigated the demand in improvement in the existing water purification systems. Numerous organic, and later inorganic materials, have showcased huge potential in different membrane separation processes. Recently, a novel range of two-dimensional (2D) materials possessing atomic thickness, high robustness, excellent mechanical stability, and even great fouling resistance have shown their appealing potential as membrane materials in this respect. The high aspect ratios of 2D materials enable the feasible control of membrane assembled structures. The membrane structure of 2D materials plays a crucial role in separation performance. Regarding the molecular transport pathway, the assembled structure is categorized into laminates and in-plane pores here. From this aspect, this review discusses the most recently progress of 2D materials membranes, including graphene-based materials, MXenes, transition metal dichalcogenides, metal organic frameworks, covalent organic frameworks, and boron nitride, in the field of water purification. According to their membrane assembled structures, the design strategies with separation mechanism and separation performance have been reviewed. Lastly, challenges and futuristic upgrades to enhance their membrane operation are discussed accordingly. This review provides a new perspective of 2D material assemblies on membrane design for advancing separation performance in water purification.

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“…Chandio et al [25] have functionalized GO with serine amino acid and achieved rejection up to 92.2% for Pb 2+ along with good permeance ~ 192 ± 2 Lm -2 h -1 bar -1 . Therefore, cost-effective graphene membranes are urgently required for separation of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Bio-Inspired Graphene Oxide membranes for Efficient Separation of Heavy Metal Ions and Desalination of Water

Janwery

Memon

Rehman

et al. 2022

Preprint

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Sufficient efforts have been carried out to fabricate highly efficient graphene oxide (GO) lamellar membranes for heavy metal ion separation and desalination of water. However, selectivity for small ions remains a major problem. Herein, GO-based bio-inspired membranes are fabricated by green method and used for selective separation of heavy metal ions and water desalination. The GO is modified with Onion extractive (OE) and fabricated into GO/OE composite membranes. The GO/OE composite membrane (350 nm) shows an excellent rejection efficiency for several heavy metal ions such as Cr6+ (~ 87.5%), As3+ (~ 89.5%), Cd2+ (~ 93.0%), Pb2+ (~ 99.5%), and good water permeance ∼460 ± 20 Lm− 2h− 1bar− 1. In addition, GO/Quercetin (GO/Q) membrane is also fabricated from quercetin for comparative studies. Quercetin is active ingredient of onion extractives. The GO/Q composite membranes show good rejection up to ~ 78.0%, ~ 80.5%, ~ 88.0% and 95.2% for Cr6+, As3+, Cd2+, and Pb2+ respectively with DI water permeance ∼150 ± 10 Lm− 2h− 1bar− 1. Further, both membranes are used for water desalination by measuring rejection of small ions such as NaCl, Na2SO2, MgCl2, and MgSO4. The resulting membranes show ˃70% rejection for small ions. In addition, both membranes use for filtration of Indus River water and GO/Q membrane shows remarkable high separation efficiency and making river water suitable for drinking purpose. Furthermore, the GO/QE composite membrane is highly stable up to ~ 25 days under acidic, basic and neutral environments as compared to GO/Q composite and pristine GO-based membranes.

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Ultrafast ionic and molecular sieving through graphene oxide based composite membranes

Cited by 80 publications

References 42 publications

Functionalized Graphene Oxide-Based Lamellar Membranes with Tunable Nanochannels for Ionic and Molecular Separation

Functionalized Graphene Oxide-Based Lamellar Membranes with Tunable Nanochannels for Ionic and Molecular Separation

Structure Dependent Water Transport in Membranes Based on Two-Dimensional Materials

Bio-Inspired Graphene Oxide membranes for Efficient Separation of Heavy Metal Ions and Desalination of Water

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