scholarly journals High efficiency solar desalination and dye retention of plasmonic/reduced graphene oxide based copper oxide nanocomposites

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15184-15194
Author(s):  
Doaa A. Kospa ◽  
Awad I. Ahmed ◽  
Salem E. Samra ◽  
Amr Awad Ibrahim
Keyword(s):  
Graphene Oxide ◽  
Copper Oxide ◽  
Reduced Graphene Oxide ◽  
High Efficiency ◽  
Water Desalination ◽  
Solar Desalination ◽  
Reduced Graphene ◽  
Dye Retention

Water desalination via solar-driven interfacial evaporation is one of the most essential technologies to limit the problem of global freshwater scarcity.

scholarly journals Free-standing reduced graphene oxide (rGO) membrane for salt-rejecting solar desalination via size effect

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4601-4608 ◽  
Author(s):  
Pengyu Zhuang ◽  
Hanyu Fu ◽  
Ning Xu ◽  
Bo Li ◽  
Jun Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Conversion Efficiency ◽  
High Salinity ◽  
Interlayer Spacing ◽  
Structural Instability ◽  
Solar Thermal ◽  
Free Standing ◽  
Solar Desalination ◽  
Reduced Graphene

AbstractInterfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m−2 h−1 (solar–thermal conversion efficiency ∼79%) under one sun, out of 3.5 wt% brine. More strikingly, due to the tailored narrow interlayer spacing, the rGO membrane can effectively reject ions, preventing salt accumulation even for high salinity brine (∼8 wt% concentration). With enabled salt-antifouling capability, flexibility, as well as stability, our rGO membrane serves as a promising solar evaporator for high salinity brine treatment.

scholarly journals Stable metal anodes enabled by a labile organic molecule bonded to a reduced graphene oxide aerogel

2020 ◽  
Vol 117 (48) ◽  
pp. 30135-30141
Author(s):  
Yue Gao ◽  
Daiwei Wang ◽  
Yun Kyung Shin ◽  
Zhifei Yan ◽  
Zhuo Han ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Efficiency ◽  
High Current Density ◽  
Solid Electrolyte Interphase ◽  
Metal Deposition ◽  
Reduced Graphene ◽  
Lithium Deposition ◽  
Reduced Graphene Oxide Aerogel ◽  
Graphene Oxide Aerogel

Metallic anodes (lithium, sodium, and zinc) are attractive for rechargeable battery technologies but are plagued by an unfavorable metal–electrolyte interface that leads to nonuniform metal deposition and an unstable solid–electrolyte interphase (SEI). Here we report the use of electrochemically labile molecules to regulate the electrochemical interface and guide even lithium deposition and a stable SEI. The molecule, benzenesulfonyl fluoride, was bonded to the surface of a reduced graphene oxide aerogel. During metal deposition, this labile molecule not only generates a metal-coordinating benzenesulfonate anion that guides homogeneous metal deposition but also contributes lithium fluoride to the SEI to improve Li surface passivation. Consequently, high-efficiency lithium deposition with a low nucleation overpotential was achieved at a high current density of 6.0 mA cm−2. A Li|LiCoO2cell had a capacity retention of 85.3% after 400 cycles, and the cell also tolerated low-temperature (−10 °C) operation without additional capacity fading. This strategy was applied to sodium and zinc anodes as well.

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.

A bridge-arched and layer-structured hollow melamine foam/reduced graphene oxide composite with an enlarged evaporation area and superior thermal insulation for high-performance solar steam generation

2020 ◽  
Vol 8 (5) ◽  
pp. 2701-2711 ◽  
Author(s):  
Sen Meng ◽  
Xing Zhao ◽  
Chun-Yan Tang ◽  
Peng Yu ◽  
Rui-Ying Bao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Thermal Insulation ◽  
High Performance ◽  
High Efficiency ◽  
Insulation Layer ◽  
Steam Generation ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Solar Steam Generation

A bridge-arched integrated evaporator that introduces air as the thermal insulation layer exhibits high-efficiency solar steam generation.

Fabrication of reduced graphene oxide membranes for water desalination

2019 ◽  
Vol 572 ◽  
pp. 12-19 ◽  
Author(s):  
Hsin-Hui Huang ◽  
Rakesh K. Joshi ◽  
K. Kanishka H. De Silva ◽  
Rajashekar Badam ◽  
Masamichi Yoshimura
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Desalination ◽  
Reduced Graphene ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes
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