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.

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

scholarly journals Graphenic Materials for Biomedical Applications

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1758 ◽  
Author(s):  
Daniela Plachá ◽  
Josef Jampilek
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Protein Delivery ◽  
Biomedical Applications ◽  
Carbon Nanomaterials ◽  
Antimicrobial Properties ◽  
Delivery Systems ◽  
Research Results ◽  
Reduced Graphene ◽  
Application Potential

Graphene-based nanomaterials have been intensively studied for their properties, modifications, and application potential. Biomedical applications are one of the main directions of research in this field. This review summarizes the research results which were obtained in the last two years (2017–2019), especially those related to drug/gene/protein delivery systems and materials with antimicrobial properties. Due to the large number of studies in the area of carbon nanomaterials, attention here is focused only on 2D structures, i.e. graphene, graphene oxide, and reduced graphene oxide.

scholarly journals Nano-manganese oxide and reduced graphene oxide incorporated polyacrylonitrile fiber mats as electrode material for capacitive deionization (CDI) technology

2021 ◽  
Author(s):  
Nalin De Silva ◽  
Induni Siriwardena ◽  
Nadeesha P. W. Rathuwadu ◽  
Damayanthi Dahanayake ◽  
Chanaka Sandaruwan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Manganese Dioxide ◽  
Reduced Graphene Oxide ◽  
Electrode Material ◽  
Water Desalination ◽  
Polyacrylonitrile Fiber ◽  
Capacitive Deionization ◽  
Fiber Mats ◽  
Reduced Graphene ◽  
Impurity Ions

Capacitive deionization (CDI) is a trending water desalination method, during which the impurity ions in water can be removed by electrosorption. In this study, nano-manganese dioxide (MnO2) and reduced graphene...

scholarly journals Reduction of graphene oxide in ethanol solution by gamma irradiation for preparing reduced graphene oxide material with water desalination

2019 ◽  
Vol 9 (1) ◽  
pp. 34-40
Author(s):  
Thi Thu Hong Pham ◽  
Thanh Duoc Nguyen ◽  
Thi Ly Nguyen ◽  
Nhut Khanh Chu ◽  
Van Chung Cao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Dose Range ◽  
Angle Measurement ◽  
Ethanol Solution ◽  
Water Desalination ◽  
Oxide Material ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
Γ Ray

Reduction of graphene oxide (GO) for preparing the reduced graphene oxide (rGO) by γ–ray irradiation was investigated. GO was dispersed in the ethanol solution with the GO concentration of 1 mg/ml, then irradiated with γ–ray in presence of oxygen at dose range of 0 – 100 kGy for preparation of rGO product. The characteristic properties of GO and rGO were determined by UV-Vis spectroscopy, X–ray diffraction (XRD), Transmission Electron Microscopy (TEM), contact angle measurement and test of water desalination. The result showed that water desalination efficiency of rGO was about 46 – 48%.

Reduced graphene oxide/TiO2 nanocomposites coating of cotton fabrics with antibacterial and self-cleaning properties

2018 ◽  
Vol 49 (3) ◽  
pp. 277-293 ◽  
Author(s):  
Miruna S Stan ◽  
Ionela C Nica ◽  
Marcela Popa ◽  
Mariana C Chifiriuc ◽  
Ovidiu Iordache ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Large Scale ◽  
Color Change ◽  
Water Repellency ◽  
Cotton Fabrics ◽  
Hydrothermal Conditions ◽  
Antimicrobial Efficiency ◽  
Reduced Graphene ◽  
Self Cleaning

Textile materials can be easily used as a support for the nano-decoration with active particles in order to gain new features such as self-cleaning, antimicrobial efficiency, water repellency, mechanical strength, color change and protection against ultraviolet radiations. In this context, our present research reports the fabrication and characterization (physico-chemical analysis and surface morphology) of cotton fabrics treated with reduced graphene oxide decorated with two types of TiO2 nanoparticles co-doped with 1% iron and nitrogen atoms (TiO2/rGO NPs) and synthesized in different hydrothermal conditions by a simultaneous precipitation of Ti3+ and Fe3+ ions to achieve their uniform distribution or after a sequential precipitation of these two cations for obtaining a higher concentration of iron on the surface of Ti4+ oxyhydroxide. Further, the antimicrobial efficiency of these TiO2/rGO-treated textiles and their influence on human cells were assessed. We demonstrated the successful development of TiO2/rGO coating of cotton fabrics which are harmless for human skin cells and inhibit the growth of Staphylococcus aureus and Enterococcus faecalis. These findings confirm their great potential as novel graphene-based materials for biomedical and photocatalytic applications and this approach could be used for the large-scale fabrication of innovative self-cleaning and antimicrobial textiles.

scholarly journals Activated Carbon Blended with Reduced Graphene Oxide Nanoflakes for Capacitive Deionization

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1090
Author(s):  
Gbenro Folaranmi ◽  
Mikhael Bechelany ◽  
Philippe Sistat ◽  
Marc Cretin ◽  
Francois Zaviska
Keyword(s):  
Graphene Oxide ◽  
Activated Carbon ◽  
Reduced Graphene Oxide ◽  
Electrode Materials ◽  
Porous Electrodes ◽  
Water Desalination ◽  
Operating Voltage ◽  
Capacitive Deionization ◽  
X Ray ◽  
Reduced Graphene

Capacitive deionization is a second-generation water desalination technology in which porous electrodes (activated carbon materials) are used to temporarily store ions. In this technology, porous carbon used as electrodes have inherent limitations, such as low electrical conductivity, low capacitance, etc., and, as such, optimization of electrode materials by rational design to obtain hybrid electrodes is key towards improvement in desalination performance. In this work, different compositions of mixture of reduced graphene oxide (RGO) and activated carbon (from 5 to 20 wt% RGO) have been prepared and tested as electrodes for brackish water desalination. The physico-chemical and electrochemical properties of the activated carbon (AC), reduced graphene oxide (RGO), and as-prepared electrodes (AC/RGO-x) were characterized by low-temperature nitrogen adsorption measurement, scanning electron microscope (SEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transform infra-red (FT-IR), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Among all the composite electrodes, AC/RGO-5 (RGO at 5 wt%) possessed the highest specific capacitance (74 F g−1) and the highest maximum salt adsorption capacity (mSAC) of 8.10 mg g−1 at an operating voltage ∆E = 1.4 V. This shows that this simple approach could offer a potential way of fabricating electrodes of accentuated carbon network of an improved electronic conductivity that’s much coveted in CDI technology.

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