scholarly journals Novel Structures and Applications of Graphene-Based Semiconductor Photocatalysts: Faceted Particles, Photonic Crystals, Antimicrobial and Magnetic Properties

2021 ◽  
Vol 11 (5) ◽  
pp. 1982
Author(s):  
Marcin Janczarek ◽  
Maya Endo-Kimura ◽  
Zhishun Wei ◽  
Zuzanna Bielan ◽  
Tharishinny R. Mogan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photonic Crystals ◽  
Pure Water ◽  
Substantial Impact ◽  
Clean Environment ◽  
Reduced Graphene ◽  
Recent Developments ◽  
Activity Mechanism ◽  
Faceted Particles ◽  
Novel Structures

Graphene, graphene oxide, reduced graphene oxide and their composites with various compounds/materials have high potential for substantial impact as cheap photocatalysts, which is essential to meet the demands of global activity, offering the advantage of utilizing “green” solar energy. Accordingly, graphene-based materials might help to reduce reliance on fossil fuel supplies and facile remediation routes to achieve clean environment and pure water. This review presents recent developments of graphene-based semiconductor photocatalysts, including novel composites with faceted particles, photonic crystals, and nanotubes/nanowires, where the enhancement of activity mechanism is associated with a synergistic effect resulting from the presence of graphene structure. Moreover, antimicrobial potential (highly needed these days), and facile recovery/reuse of photocatalysts by magnetic field have been addresses as very important issue for future commercialization. It is believed that graphene materials should be available soon in the market, especially because of constantly decreasing prices of graphene, vis response, excellent charge transfer ability, and thus high and broad photocatalytic activity against both organic pollutants and microorganisms.

scholarly journals Metal selenides for photocatalytic Z-scheme pure water splitting mediated by reduced graphene oxide

2019 ◽  
Vol 40 (11) ◽  
pp. 1668-1672 ◽  
Author(s):  
Shanshan Chen ◽  
Takashi Hisatomi ◽  
Guijun Ma ◽  
Zheng Wang ◽  
Zhenhua Pan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Splitting ◽  
Pure Water ◽  
Reduced Graphene ◽  
Metal Selenides

scholarly journals Development of polyethersulfone (PES)/reduced graphene oxide nanocomposite nanofiltration membrane

2020 ◽  
Vol 16 (4) ◽  
pp. 418-421
Author(s):  
Norzakiah Hamzah ◽  
Fasihah Johary ◽  
Rosiah Rohani ◽  
Syazrin Syima Sharifuddin ◽  
Mohd Hafez Mohd Isa
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Pure Water ◽  
Inversion Method ◽  
Nanofiltration Membrane ◽  
Membrane Pore ◽  
Water Permeation ◽  
Salt Rejection ◽  
Casting Solution ◽  
Reduced Graphene

Polyethersulfone (PES) is a polymeric material that is commonly used due to its chemical resistance, high mechanical strength, and thermal stability. The improvement of PES hydrophilicity and anti-fouling properties can be facilitated by mixing additives into the polymer casting solution. This study involved the preparation and characterization of PES/pluronic F108/chitosan/reduced graphene oxide (rGO) nanocomposite nanofiltration membrane. The modified PES membrane was developed by employing the phase inversion method via immersion precipitation. The effect of varying concentration of rGO nanocomposite ranging from 0.05 to 0.20 wt% in the fabricated membrane was evaluated in terms of membrane pure water permeation (PWP), salt rejection, morphology, and hydrophilicity. Images obtained from scanning electron microscopy (SEM) showed increasing rGO nanocomposite concentration in the casting solution, resulted in the increase in membrane sub layer thickness, hydrophilicity, salt rejection, and improvement in the membrane pore structure. Fourier transform-infrared (FTIR) spectroscopy confirmed the presence of the hydrophilic functional group and chemical compound in the prepared membrane. PES with 0.20 wt% of rGO nanocomposite obtained the highest PWP at 28.64 (L/m2h) at 5 bar pressure, whereas the highest rejections of monovalent and multivalent salt were obtained by PES with 0.15 wt% rGO nanocomposite with 75% and 89% rejections, respectively at 5 bar pressure. This study shows that the utilization of rGO nanocomposite as an additive in the PES casting solution can enhance nanofiltration membrane performance and morphological structure.

Rational design of reduced graphene oxide film for solar thermal desalination

2019 ◽  
Vol 19 (6) ◽  
pp. 1704-1710
Author(s):  
Yuan Meng ◽  
Haibo Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Rational Design ◽  
Evaporation Rate ◽  
Pure Water ◽  
Cost Effective ◽  
Solar Thermal ◽  
Water Evaporation ◽  
Reduced Graphene ◽  
Thermal Desalination

Abstract Solar water evaporation assisted by photothermal membranes is considered to be one of the sustainable and cost-effective strategies for pure water generation and wastewater treatment. In this work, a self-assembled reduced graphene oxide (rGO) film has been prepared and proposed for direct solar thermal desalination. The morphology, structure, absorbance and desalination performance of the rGO film are explored. It is found that rGO film with optimized microstructure delivers an evaporation rate of 0.87 kg m−2 h−1 with solar thermal conversion efficiency of 46% under 1 sun illumination. Moreover, the evaporation rate of rGO film remains at 0.86 kg/m2·h−1 after ten times recycling, demonstrating the superior reusability.

scholarly journals Nanostructured Nickel Nitride with Reduced Graphene Oxide Composite Bifunctional Electrocatalysts for an Efficient Water-Urea Splitting

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1583 ◽  
Author(s):  
Feng Wang ◽  
Dongsheng Zhao ◽  
Linbao Zhang ◽  
Liming Fan ◽  
Xiutang Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nickel Foam ◽  
Pure Water ◽  
Three Dimensional ◽  
High Hydrogen ◽  
Oxide Composite ◽  
Reduced Graphene ◽  
Nickel Nitride ◽  
Effective Water

A three-dimensional nickel nitride with reduced graphene oxide composite on nickel foam (s-X, where s represents Ni3N/rGO@NF and the annealing temperature X can be 320, 350, or 380) electrode has been fabricated through a facile method. We demonstrate that s-350 has excellent urea oxidation reaction (UOR) activity, with a demanded potential of 1.342 V to reach 10 mA/cm2 and bears high hydrogen evolution reaction (HER) activity. It provides a low overpotential of 124 mV at 10 mA/cm2, which enables the successful construction of its two-electrode alkaline electrolyzer (s-350||s-350) for water–urea splitting. It merely requires a voltage of 1.518 V to obtain 100 mA/cm2 and is 0.145 V lower than that of pure water splitting. This noble metal-free bifunctional electrode is regarded as an inexpensive and effective water–urea electrolysis assisted hydrogen production technology, which is commercially viable.

High Toughness Inorganic Solid Electrolytes via the Use of Reduced Graphene-Oxide

2020 ◽  
Author(s):  
Christos E. Athanasiou ◽  
Mok Yun Jin ◽  
Cristina Ramirez ◽  
Nitin P. Padture ◽  
Brian W. Sheldon
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Solid Electrolytes ◽  
High Toughness ◽  
Reduced Graphene
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