scholarly journals Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 809
Author(s):  
Xinming Xia ◽  
Feng Zhou ◽  
Risheng Yu ◽  
Longsheng Cao ◽  
Liang Chen
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Waste Treatment ◽  
Liquid Waste ◽  
Rejection Rate ◽  
Radioactive Liquid Waste ◽  
Permeable Membrane ◽  
Reduced Graphene ◽  
Oxide Membrane ◽  
Water Permeance

Membrane methods exhibit great potential for application in radioactive liquid waste treatment. In this work, we prepared a reduced graphene oxide using the amino-hydrothermal method (AH-rGO) that exhibited effective rejection rates of 99.9% for CoCl2, ZnCl2, NiCl2, and radionuclide 60Co solutions with an ultrahigh water permeance of >71.9 L m−2 h−1 bar−1. The thickness of the AH-rGO membranes affects the water permeance, as the membrane with a thickness of ≈250 nm has the highest water permeance of up to 125.1 L m−2 h−1 bar−1 with the corresponding rejection rate of 86.8%. Importantly, this is the most permeable membrane with a satisfactory level of the rejection rate for typical radioactive ions of Co2+, Zn2+, and Ni2+. Moreover, the AH-rGO membranes presented excellent stability. These findings demonstrate the potential of reduced graphene oxide (rGO) membranes for radioactive liquid waste treatment.

Developing a HEC/CMC-Reduced Graphene Oxide Hydrogel Nanocomposite for Seawater Desalination

2021 ◽  
Vol 324 ◽  
pp. 173-178
Author(s):  
Terence Tumolva ◽  
Kenneth Carmelo Madamba ◽  
Isabelle Gabrielle Nunag ◽  
Vinz Gabriel Villanueva
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Forward Osmosis ◽  
Antimicrobial Properties ◽  
Water Desalination ◽  
Small Scale ◽  
Cellulose Derivatives ◽  
Permeable Membrane ◽  
Antimicrobial Efficiency ◽  
Reduced Graphene

Current available methods for water desalination are energy intensive, expensive, and not feasible for small-scale applications. As an alternative, hydrogels may be utilized as a draw agent and semi-permeable membrane forward osmosis by acting as both to desalinate water. This study aims to synthesize and characterize hydrogels made from cellulose derivatives and reduced graphene oxide nanofillers in order to desalinate and remove microbes from seawater without requiring a large energy input. The hydrogels are formed by combining carboxymethyl cellulose, hydroxymethyl cellulose, reduced graphene oxide, and water to form a paste which is soaked in a crosslinking solution made of citric acid. Swelling, compression, antimicrobial efficiency and desalination efficiency tests were done. The hydrogel that obtained the highest values has a swelling ratio of 1,447%, compressive strength of 4 bar, desalination efficiency of 30%, and antimicrobial properties.

Enhanced interfacial solar steam generation with composite reduced graphene oxide membrane

Solar Energy ◽  
2019 ◽  
Vol 194 ◽  
pp. 415-430 ◽  
Author(s):  
Gong Cheng ◽  
Xinzhi Wang ◽  
Xing Liu ◽  
Yurong He ◽  
Boris V. Balakin
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Steam Generation ◽  
Reduced Graphene ◽  
Solar Steam Generation ◽  
Oxide Membrane

scholarly journals Reduced graphene oxide membrane as supporting film for high-resolution cryo-EM

2021 ◽  
Author(s):  
Nan Liu ◽  
Liming Zheng ◽  
Jie Xu ◽  
Jia Wang ◽  
Cuixia Hu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Resolution ◽  
Reduced Graphene Oxide ◽  
Interface Problem ◽  
Specimen Preparation ◽  
Simple Method ◽  
Reduced Graphene ◽  
Two Dimensional Materials ◽  
Air Water Interface ◽  
Oxide Membrane

AbstractAlthough single-particle cryogenic electron microscopy (cryo-EM) has been applied extensively for elucidating many crucial biological mechanisms at the molecular level, this technique still faces critical challenges, the major one of which is to prepare the high-quality cryo-EM specimen. Aiming to achieve a more reproducible and efficient cryo-EM specimen preparation, novel supporting films including graphene-based two-dimensional materials have been explored in recent years. Here we report a robust and simple method to fabricate EM grids coated with single- or few-layer reduced graphene oxide (RGO) membrane in large batch for high-resolution cryo-EM structural determination. The RGO membrane has decreased interlayer space and enhanced electrical conductivity in comparison to regular graphene oxide (GO) membrane. Moreover, we found that the RGO supporting film exhibited nice particle-absorption ability, thus avoiding the air-water interface problem. More importantly, we found that the RGO supporting film is particularly useful in cryo-EM reconstruction of sub-100 kDa biomolecules at near-atomic resolution, as exemplified by the study of RBD-ACE2 complex and other small protein molecules. We envision that the RGO membranes can be used as a robust graphene-based supporting film in cryo-EM specimen preparation.

Spontaneous power source in ambient air of a well-directionally reduced graphene oxide bulk

2018 ◽  
Vol 11 (10) ◽  
pp. 2839-2845 ◽  
Author(s):  
Huhu Cheng ◽  
Yaxin Huang ◽  
Fei Zhao ◽  
Ce Yang ◽  
Panpan Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Functional Groups ◽  
Ambient Air ◽  
Power Source ◽  
Ambient Atmosphere ◽  
Reduced Graphene ◽  
Electric Generation ◽  
Oxide Membrane

Spontaneous electric generation (voltage up to 450 mV) in ambient atmosphere has been achieved on a functional groups-reconfigured graphene oxide membrane.

Ultrahigh water permeation with high multivalent metal ions rejection rate through graphene oxide membranes

2020 ◽  
Author(s):  
Fangfang Dai ◽  
Feng Zhou ◽  
Junlang Chen ◽  
Shanshan Liang ◽  
Liang Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Ions ◽  
Rejection Rate ◽  
Permeable Membrane ◽  
Water Permeation ◽  
Satisfactory Level ◽  
Time Operation ◽  
High Rejection Rate ◽  
Multivalent Metal ◽  
Water Permeance

Abstract Graphene oxide (GO) membranes show exceptional molecular permeation properties and have gained tremendous attention in the area of wastewater treatment. However, they still suffer from some limitations, such as low water permeance when the ion rejection rate is at a satisfactory level and unstable performance. Here, we develop a sort of GO membrane that exhibits ultrahigh water permeance up to 75.2 L m−2 h−1 bar−1 while still maintaining a high rejection rate of 99.9% for multivalent metal ions. Importantly, of all state-of-the-art nanofiltration membranes, this is the most permeable membrane with a satisfactory level of rejection rate for multivalent ions. Furthermore, the GO membrane has outstanding stability over long-time operation. Our work provides a simple way to fabricate GO membranes with outstanding water purification performance.

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