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Article
Chemistry, Multidisciplinary
Tiantian Gao et al.
Summary: In this study, tunable arch-bridged reduced graphene oxide (rGO) nanofiltration membranes were developed through the application of voltage. These membranes demonstrated the ability to reject organic/anionic molecules under a finite voltage of 5 V. With assistance from the voltage, the positively-charged modified rGO membrane could universally reject both cationic and anionic dyes, even in harsh organic solvents. The efficient electrical modulation of these membranes was attributed to the synergetic effects of Donnan repulsion and size exclusion, making them promising for applications in industries such as pharmaceuticals.
Article
Engineering, Chemical
Inamullah Mahar et al.
Summary: High contamination of toxic heavy metals such as lead and arsenic in water is a major threat to human health and aquatic life. MXene/Carbon composite-based nanofibers (MXene/CNFs) membrane was synthesized and showed efficient removal of lead and arsenic ions up to their permissible limits. The adsorption results fit well with both the Langmuir and the pseudosecond-order models. The MXene/CNFs composite membrane demonstrated high adsorption capability and good recycling performance.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Multidisciplinary Sciences
Junhyeok Kang et al.
Summary: Layered two-dimensional materials with interlayer structures can be used for organic solvent nanofiltration (OSN) membranes due to their precise molecular sieving ability and stability in harsh conditions. In this study, nanoporous graphene (NG) with a high density of sp(2) carbon domains was synthesized by microwave treatment and showed ultrafast organic solvent permeance and excellent stability. The membrane's molecular weight cut-off (MWCO) can be switched depending on the solvent type, allowing for the separation of multiple organic mixtures using a single membrane.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Dahar Janwery et al.
Summary: Significant efforts have been made to develop efficient graphene oxide (GO) lamellar membranes for heavy metal ion separation and water desalination. However, the selectivity for small ions has remained a challenge. In this study, GO was modified using onion extractive (OE) and quercetin, and the resulting membranes showed excellent rejection efficiency for heavy metal ions and good water permeance. The modified membranes also demonstrated high rejection for small ions and effective filtration of river water. Furthermore, the GO/OE composite membrane exhibited superior stability compared to the GO/Q composite and pristine GO-based membranes.
Article
Engineering, Environmental
Zhe Yang et al.
Summary: Developing ultra-permeable nanofiltration (UPNF) membranes has been a focus research area for NF-based water treatment. This study analyzes the potential benefits of UPNF membranes, including reducing energy consumption and enabling new process opportunities. The critical analysis of membrane development suggests that UPNF membranes have the potential for improved selectivity and antifouling performance. This perspective paper offers important insights for the future development of NF-based water treatment technology.
Article
Engineering, Environmental
Muhammad Khurram Shahzad et al.
Summary: This review summarizes the potential of molybdenum sulfide (MoS2)-based lamellar membranes in the treatment of effluent wastewater, seawater desalination, gas separation, energy storage, and fuel cell applications. The current manufacturing methods, advantages, and drawbacks are discussed. The uses of MoS2-based membranes in water desalination, gas separation, proton exchange in fuel cells, and energy storage devices are highlighted. Finally, the benefits, limitations, and future challenges are summarized in detail.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Ashique Hussain Jatoi et al.
Summary: In this study, two-dimensional graphene oxide-based membranes were fabricated by surface modification of graphene oxide with six-armed poly(ethylene glycol) (PEG) at room temperature. The as-modified PEGylated graphene oxide (PGO) membranes showed unique layered structures and large interlayer spacing, which made them suitable for organic solvent nanofiltration. The prepared PGO membrane exhibited superior separation efficiency (>99%) for several dye molecules and had high methanol permeance (155 +/-10 L m(-2) h(-1)), which was 10-100 times higher than pristine GO membranes. The PGO membranes also showed stability for up to 20 days in organic solvent. Therefore, these results suggest that the synthesized PGO membranes with superior separation efficiency can be used for organic solvent nanofiltration in the future.
Article
Chemistry, Multidisciplinary
Tiantian Gao et al.
Summary: In this study, we report tunable arch-bridged reduced graphene oxide (rGO) nanofiltration membranes that can be modulated by applied voltage. The membranes exhibit complete rejection of organic/anionic molecules under a voltage of 5 V. By modifying the membrane with positive charges and applying voltage, the membranes show universal rejection of both cationic and anionic dyes, even in harsh organic solvents. The efficient electrical modulation is achieved through the synergistic effects of Donnan repulsion and size exclusion, enhanced by the electric field in arch-bridged rGO structures.
Article
Engineering, Chemical
Shuai Wang et al.
Summary: Graphene-based membranes have gained attention in desalination and water treatment due to their unique physical and chemical characteristics. However, the permeability-selectivity trade-off of graphene oxide membranes has limited their real-world applications. This study demonstrates the feasibility of small-flakes reduced graphene oxide membranes for nanofiltration, achieving higher water permeance and maintaining high rejection rates. The research sheds light on improving the performance and stability of graphene oxide-based membranes.
Article
Engineering, Chemical
Jiyu Zou et al.
Summary: Hydrogen peroxide, a green oxidant, has broad and increasing applications. Membrane technology offers a promising solution for in-situ production and concentration of hydrogen peroxide. Graphene oxide membranes show superior separation performance and antioxidative ability compared to conventional water-permeable membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Shuai Wang et al.
Summary: This study demonstrates the significantly enhanced ion sieving performance of K+-controlled graphene oxide membranes (K-GOMs), which show high ion selectivity and permeation rate, as well as selectivity for multivalent ions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Chemical
Ziheng Wang et al.
Summary: This study demonstrates the use of polyethyleneimine (PEI) with different molecular weights to crosslink graphene oxide (GO) nanosheets and tune the interlayer spacing of the GO membrane. The dual crosslinking structure effectively restrains the swelling of GO and enhances the performance of the membrane in desalination. The optimized membrane exhibits outstanding pervaporation (PV) desalination performance with high water flux and salt rejection.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Meidi Wang et al.
Summary: The lack of access to clean water for billions of people is a global sustainability challenge, which can be addressed by membrane technologies. The use of covalent organic framework (COF) membranes can achieve ultrafast desalination and excellent fouling resistance, offering great potential in practical applications.
NATURE SUSTAINABILITY
(2022)
Review
Chemistry, Multidisciplinary
Faisal Rehman et al.
Summary: TMDCs-based laminar membranes have significant potential in energy storage, wastewater treatment, and desalination applications. This review summarizes recent efforts and development in this field, with a focus on fabrication strategies.
Article
Engineering, Chemical
Tobias Foller et al.
Summary: This article discusses the potential of novel 2D materials-based membranes in nanofiltration and desalination technologies, highlighting the importance of evaluating critical filtration parameters for membrane performance. It also proposes best-practice methods to accelerate the industrialization of 2D materials-based membranes and suggests the next steps towards real-world applications.
Article
Nanoscience & Nanotechnology
Rahul S. Zambare et al.
Summary: There has been a growing interest in water purification using graphene oxide (GO) laminate membranes. In this study, a stable methylimidazolium ionic liquid-reduced GO (mimG)-assembled GO laminate membrane (mimG-GO) was fabricated for water purification. The membrane showed enhanced salt and dye separation performance, as well as improved stability in aqueous environments.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Chemical
Idit Shefer et al.
Summary: This study systematically investigated the hindrance effects on water-salt and ion-ion selectivity in nanofiltration and reverse osmosis membranes. The research found that water-salt selectivity is driven by entropy, while ion-ion selectivity is limited by an enthalpy-entropy compensation effect. Possible mechanisms promoting this compensation effect during ion transport in salt-rejecting membranes were proposed.
Article
Engineering, Environmental
Baian Kuang et al.
Summary: This study presents a high-performance and stable two-dimensional framework membrane for water purification and remediation, which is self-assembled by graphene oxide nanosheets and aminoappended metal-organic polyhedrons. The framework membrane shows improved stability and nanofiltration performance, and high rejections for various contaminants in wastewaters.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Junfan Liu et al.
Summary: In this study, a nacre-like structure membrane based on graphene oxide (GO) cross-linked by amino acid was fabricated. The membrane exhibited high water permeance and metal ions rejection, and showed stable separation performance for a long time.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Jie Long et al.
Summary: As natural resources become scarce, reducing energy consumption in membrane separation processes is essential. Graphene oxide (GO) membranes have shown great potential for wastewater purification, but increasing water permeance while maintaining removal efficiency and stability remains challenging. In this study, membranes with ultrafast water permeability were prepared using carbohydrazide (CHZ) as a reducing and cross-linking agent. The obtained rGO/CHZ nanofiltration membranes exhibited a water permeance greater than 1600 L m(-2)h(-1) bar(-1) and excellent separation efficiency, with removal rates of 99% for Congo Red (CR), Malachite Green (MG), and Crystal Violet (CV). The membranes also showed efficient selective separation of various mixed dyes. The composite membrane demonstrated excellent stability even after long-term immersion in solutions of different pH values. The promising performance of complete rejection of single dyes and selective filtration of mixed dyes makes them a potential material for dye separation, purification, and reuse.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Akbar Ali et al.
Summary: By functionalizing GO-based membranes, a class of 2D GO lamellar membranes with controlled pores have been prepared, showing excellent performance in ion and dye separation.
Article
Engineering, Chemical
Farooque Ahmed Janjhi et al.
Summary: This review summarizes different fabrication methods of graphene oxide (GO)-based membranes and discusses the influence of functionalization and cross-linking on membrane properties. It also provides a detailed discussion on the application of GO-based membranes for separation and removal of heavy metal ions. Recommendations and future directions are suggested.
CHEMBIOENG REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Fengshi Li et al.
Summary: In this study, a super-strong and flexible fiber was successfully prepared by introducing a crystalline GO and amorphous ZrO2 superstructure, which is analogous to a naturally ordered microstructure in nacre. The fiber showed excellent combination of high strength and toughness. The findings demonstrate that the crystalline-amorphous dual-phase strategy can serve as an economical and environment-friendly method to prepare GO-based fibers with high performance.
Article
Chemistry, Multidisciplinary
Wuerkaixi Maimuli et al.
Summary: A new type of F-GO membrane with larger interlayer spacing and F-functioned channels showed excellent water permeance and ion rejection, making it promising for wastewater treatment.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Yu-Shan Zhang et al.
Summary: Graphite, traditionally used in lithium-ion batteries, faces limitations due to its small interlayer spacing for sodium-ion insertion/extraction. An emerging approach involving chain-like H2N(CH2)xNH(2) between graphene oxide layers expands the interlayer spacing, enhances structure stability, and achieves excellent sodium storage performance.
ENERGY STORAGE MATERIALS
(2021)
Article
Engineering, Chemical
Rujie Yang et al.
Summary: In this study, robust K+-crosslinked reduced GO membranes were developed for treating wastewater containing multivalent heavy metal ions, showing high water permeance and excellent aqueous stability. The improved permeability was attributed to cation-pi interactions between K+ and rGO sheets, enhancing membrane stability and potential for industrial membrane separation applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Ruobing Yi et al.
Summary: This study demonstrates the precise selective reduction of graphene oxide (GO) flakes with low epoxy content but high hydroxyl content using modified electron beam irradiation (EBI), leading to the fabrication of GO membranes with ultrahigh water permeation and effective rejection of dyes and multivalent metal ions. New hydroxyl groups generated by reducing epoxy using hydrogen radicals play a key role in controlling selective reduction and enhancing water purification performance of the membranes.
Article
Engineering, Chemical
Clara Skuse et al.
Summary: Growing uncertainty in future freshwater availability has led to an increase in desalination installations. Reverse osmosis (RO) is the most widely adopted technique, but alternatives such as forward osmosis (FO), membrane distillation (MD) and capacitive deionisation (CDI) offer potential advantages and recent advancements in these fields are discussed.
Article
Engineering, Chemical
Imamdin Chandio et al.
Summary: A class of GO-based composite membranes with large interlayer spacing was fabricated using serine amino acid as a cross-linker and reducing agent, which showed outstanding separation efficiency and high permeance for organic dyes and salts. The membranes exhibited good rejection for various substances and high stability in aqueous environment, indicating their potential application in water filtration and desalination.
Article
Engineering, Chemical
Farooque Ahmed Janjhi et al.
Summary: This study prepared GO-based lamellar membranes from GO and ginger plant extractive (GE) with various thicknesses, showing excellent separation efficiency and ultrafast permeability for organic dyes, as well as high water permeance. The membranes also exhibited good separation efficiency in organic solvent, highlighting the great potential of GO/GE lamellar membranes in water purification, desalination, and other nanofiltration applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yuying Wu et al.
Summary: Adding g-C3N4 sheets into GO membranes to establish stable and sub-nanometer wide channels can significantly improve salt rejection and water permeance. Experimental and theoretical studies have shown that size exclusion is the main mechanism for high rejections, while the ultra-low friction water flow along g-C3N4 sheets enhances permeation. Additionally, the GO/g-C3N4 membrane exhibits promising long-term, antioxidation, and antipressure stability.
Article
Chemistry, Multidisciplinary
Kecheng Guan et al.
Summary: This study developed chemically converted graphene using a one-step method to achieve more stable and functional nanochannels, which can exclude approximately 90% of NaCl solutes from water in a pressure-driven filtration process.
Article
Chemistry, Multidisciplinary
Dian Gong et al.
Summary: This study develops a facile method to prepare perfluoro-alkyl grafted graphene membranes on porous ceramic, demonstrating efficient desalination with ultrahigh antiwetting surfaces and oriented mesoporous surface entrances. These membranes exhibit high rejection rates and water fluxes, as well as robust stability during desalination.
Article
Engineering, Chemical
Zheng Wang et al.
Summary: A stable composite membrane was developed by utilizing Cu-TCPP nanosheets to stabilize GO membranes, resulting in significantly improved water permeance and remarkable solute retention.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Chunyang He et al.
Summary: Urbanization and climate change are exacerbating global urban water scarcity, with the number of people affected projected to increase significantly by 2050, particularly in countries like India. Large cities and megacities will be most severely affected, and while infrastructure investment can help alleviate water scarcity, potential environmental trade-offs must be carefully considered.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Shania Sharif et al.
Summary: Membrane-based technology has gained significant interest for its potential applications in water purification and desalination, with two-dimensional graphene oxide (GO) and its derivatives being considered the most suitable material for membrane technology due to their exceptional properties. Challenges and future directions for such membranes will be discussed in detail.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Fangfang Dai et al.
Summary: A class of graphene oxide (GO) membranes with ultrahigh water permeance and high rejection rate for multivalent metal ions has been developed by vacuum filtration without drying treatment. These membranes exhibit outstanding stability over long-term operation and provide a simple way to fabricate GO membranes with excellent water purification performance.
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