A freestanding graphene oxide framework membrane for forward osmosis: Separation performance and transport mechanistic insights

Tong, Xin; Liu, Su; Zhao, Yangying; Xiao, Chengchao; Chen, Yongsheng; Crittenden, John C.

doi:10.1016/j.memsci.2022.120919

Cited by 11 publications

(2 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The modification of 2D materials can be classified into two basic approaches. One is a molecular modification, such as grafting of functional molecules through chemical reactions. − The other is adding functional materials to achieve multifunctionalization. , These modifications result in the generation of various composite membrane forms, which can be classified as homogeneous or heterogeneous membranes based on their structures. Homogeneous membranes are those containing only one component or with uniform distribution of additives, which are usually obtained by filtration of mixed solutions with different additives.…”

Section: D Ion-selective Membranes Under Small Test Areamentioning

confidence: 99%

Advances in Two-Dimensional Ion-Selective Membranes: Bridging Nanoscale Insights to Industrial-Scale Salinity Gradient Energy Harvesting

Ma,

Neek-Amal,

Sun

2024

ACS Nano

View full text Add to dashboard Cite

Salinity gradient energy, often referred to as the Gibbs free energy difference between saltwater and freshwater, is recognized as "blue energy" due to its inherent cleanliness, renewability, and continuous availability. Reverse electrodialysis (RED), relying on ion-selective membranes, stands as one of the most prevalent and promising methods for harnessing salinity gradient energy to generate electricity. Nevertheless, conventional RED membranes face challenges such as insufficient ion selectivity and transport rates and the difficulty of achieving the minimum commercial energy density threshold of 5 W/m 2 . In contrast, two-dimensional nanostructured materials, featuring nanoscale channels and abundant functional groups, offer a breakthrough by facilitating rapid ion transport and heightened selectivity. This comprehensive review delves into the mechanisms of osmotic power generation within a single nanopore and nanochannel, exploring optimal nanopore dimensions and nanochannel lengths. We subsequently examine the current landscape of power generation using two-dimensional nanostructured materials in laboratory-scale settings across various test areas. Furthermore, we address the notable decline in power density observed as test areas expand and propose essential criteria for the industrialization of two-dimensional ion-selective membranes. The review concludes with a forward-looking perspective, outlining future research directions, including scalable membrane fabrication, enhanced environmental adaptability, and integration into multiple industries. This review aims to bridge the gap between previous laboratory-scale investigations of two-dimensional ion-selective membranes in salinity gradient energy conversion and their potential largescale industrial applications.

show abstract

Section: D Ion-selective Membranes Under Small Test Areamentioning

confidence: 99%

Advances in Two-Dimensional Ion-Selective Membranes: Bridging Nanoscale Insights to Industrial-Scale Salinity Gradient Energy Harvesting

Ma,

Neek-Amal,

Sun

2024

ACS Nano

View full text Add to dashboard Cite

show abstract

“…Laminar graphene oxide (GO) membranes have gained considerable attention in the field of water treatment for a variety of applications, for example, nanofiltration, − membrane distillation, , pervaporation, and forward osmosis, , because of their high permeability, tunable ionic selectivity, and easy preparation. These membranes are usually fabricated by stacking GO nanosheets consisting of nonoxidized graphene regions and oxidized regions on a porous substrate.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Opening of Impermeable Nanochannels in Laminar Graphene Membranes for Ultrafast Nanofiltration

Wei

Zhang

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Reduced graphene oxide (rGO) could be theoretically used to construct highly permeable laminar membranes with nearly frictionless nanochannels for water treatment. However, their pristine (sp2 C–C) regions usually restack into impermeable channels as a result of van der Waals interactions, resulting in a much low permeance. In this study, we demonstrate that the restacked regions could be electrochemically expanded to form ultrafast water transport nanochannels by providing a low positive potential (e.g., +1.00 V vs SCE) to the rGO membrane. Experimental investigations indicate that the structural expansion is attributed to the intercalation of water molecules into the restacked regions, driven by hydrogen bond interactions between water molecules and hydroxyl groups that are electrochemically produced on edges of rGO nanosheets. The structural expansion could be promoted by weakening the graphene–OH– interactions through intermittent application of the potential. As a result of more ultrafast water transport nanochannels available, the electrochemically treated rGO membranes could have a permeance 2 orders of magnitude higher than that of the pristine one and ∼3 times higher than that of graphene oxide membranes. Because of their smaller average pore size, the rGO membranes also have a higher ionic/molecular rejection performance than graphene oxide membranes.

show abstract

Recovering electrical energy from forward osmosis process through amorphous silicon oxide crosslinked vanadium pentoxide-reduced graphene oxide membrane

Deka,

Roy,

Jyoti Konch

et al. 2023

Chemical Engineering Journal

View full text Add to dashboard Cite

A freestanding graphene oxide framework membrane for forward osmosis: Separation performance and transport mechanistic insights

Cited by 11 publications

References 57 publications

Advances in Two-Dimensional Ion-Selective Membranes: Bridging Nanoscale Insights to Industrial-Scale Salinity Gradient Energy Harvesting

Advances in Two-Dimensional Ion-Selective Membranes: Bridging Nanoscale Insights to Industrial-Scale Salinity Gradient Energy Harvesting

Electrochemical Opening of Impermeable Nanochannels in Laminar Graphene Membranes for Ultrafast Nanofiltration

Recovering electrical energy from forward osmosis process through amorphous silicon oxide crosslinked vanadium pentoxide-reduced graphene oxide membrane

Contact Info

Product

Resources

About