scholarly journals Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

Pharmaceutics ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1473
Author(s):  
Ahmed Raslan ◽  
Jesús Ciriza ◽  
Ana María Ochoa de Retana ◽  
María Luisa Sanjuán ◽  
Muhammet S. Toprak ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Regenerative Medicine ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Exciting Field ◽  
Adsorption Models ◽  
Reduced Graphene ◽  
Alginate Hydrogels ◽  
Pseudo Second Order ◽  
Hydrophobic Nature

Modifying hydrogels in order to enhance their conductivity is an exciting field with applications in cardio and neuro-regenerative medicine. Therefore, we have designed hybrid alginate hydrogels containing uncoated and protein-coated reduced graphene oxide (rGO). We specifically studied the adsorption of three different proteins, BSA, elastin, and collagen, and the outcomes when these protein-coated rGO nanocomposites are embedded within the hydrogels. Our results demonstrate that BSA, elastin, and collagen are adsorbed onto the rGO surface, through a non-spontaneous phenomenon that fits Langmuir and pseudo-second-order adsorption models. Protein-coated rGOs are able to preclude further adsorption of erythropoietin, but not insulin. Collagen showed better adsorption capacity than BSA and elastin due to its hydrophobic nature, although requiring more energy. Moreover, collagen-coated rGO hybrid alginate hydrogels showed an enhancement in conductivity, showing that it could be a promising conductive scaffold for regenerative medicine.

scholarly journals The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 681 ◽  
Author(s):  
Fabian Arias Arias ◽  
Marco Guevara ◽  
Talia Tene ◽  
Paola Angamarca ◽  
Raul Molina ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Maximum Adsorption Capacity ◽  
Green Protocol ◽  
Reduced Graphene ◽  
Wastewater Systems ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Potential Use

Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π − π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems.

A three-dimensional nickel-doped reduced graphene oxide composite for selective separation of hemoglobin with a high adsorption capacity

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56278-56286 ◽  
Author(s):  
Lei Chen ◽  
Zhang-Run Xu
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Three Dimensional ◽  
High Adsorption ◽  
Reduced Graphene ◽  
One Step ◽  
Reduced Graphene Oxide Aerogel ◽  
High Adsorption Capacity

A 3D nickel-doped reduced graphene oxide aerogel was prepared by one-step reduction and self-assembly, which exhibited favorable selectivity and high adsorption capacity for isolating hemoglobin.

Electrical current stimulated desorption of carbon dioxide adsorbed on graphene based structures

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 43401-43407 ◽  
Author(s):  
Ritesh Sevanthi ◽  
Fahmida Irin ◽  
Dorsa Parviz ◽  
W. Andrew Jackson ◽  
Micah J. Green
Keyword(s):  
Carbon Dioxide ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Joule Heating ◽  
Electrical Current ◽  
Pristine Graphene ◽  
Graphene Films ◽  
Reduced Graphene

The objective of this study was to investigate Joule heating/electric swing adsorption (ESA) as a mode of regeneration and to compare the carbon dioxide (CO2) adsorption capacity of pristine graphene films and reduced graphene oxide (rGO) aerogels.

Reduced graphene oxide membranes in ocular regenerative medicine

2020 ◽  
Vol 114 ◽  
pp. 111075
Author(s):  
Iriana Zambrano-Andazol ◽  
Natalia Vázquez ◽  
Manuel Chacón ◽  
Ronald M. Sánchez-Avila ◽  
Mairobi Persinal ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Regenerative Medicine ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

scholarly journals Hybrid materials of ZnO nanostructures with reduced graphene oxide and gold nanoparticles: enhanced photodegradation rates in relation to their composition and morphology

2016 ◽  
Vol 18 (3) ◽  
pp. 1478-1486 ◽  
Author(s):  
K. Bramhaiah ◽  
Vidya N. Singh ◽  
Neena S. John
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Hybrid Materials ◽  
Ternary Systems ◽  
Zno Nanostructures ◽  
Reduced Graphene ◽  
Binary And Ternary Systems

Binary and ternary systems of rGO, Au and ZnO with nanoparticle and nanorod morphologies are explored as photocatalysts and their photodegradation performance in relation to adsorption capacity and photoluminescence is presented.

scholarly journals Alginate/graphene double-network nanocomposite hydrogel beads with low-swelling, enhanced mechanical properties, and enhanced adsorption capacity

2016 ◽  
Vol 4 (28) ◽  
pp. 10885-10892 ◽  
Author(s):  
Yuan Zhuang ◽  
Fei Yu ◽  
Hong Chen ◽  
Jie Zheng ◽  
Jie Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Nanocomposite Hydrogel ◽  
Double Network ◽  
Hydrogel Beads ◽  
Reduced Graphene ◽  
Enhanced Adsorption

We designed and prepared a novel alginate/reduced graphene oxide double-network hydrogel and investigated its mechanical properties, stability and adsorption capacity in comparison with a single network.

Adsorption and removal of triphenylmethane dyes from water by magnetic reduced graphene oxide

2014 ◽  
Vol 70 (10) ◽  
pp. 1663-1669 ◽  
Author(s):  
Jian-Zhong Sun ◽  
Zhi-Hong Liao ◽  
Rong-Wei Si ◽  
Gakai Peter Kingori ◽  
Fu-Xiang Chang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Order Kinetic ◽  
Water Contaminants ◽  
Reduced Graphene ◽  
Organic Pollutants Removal ◽  
Adsorption Processes ◽  
Pollutants Removal ◽  
Magnetic Reduced Graphene Oxide

Triphenylmethane (TPM) dye is one of the most prevalent and recalcitrant water contaminants. Magnetic reduced graphene oxide (rGO) is an efficient adsorbent for organic pollutants removal. However, the performance and adsorption kinetics of magnetic rGO towards TPM have not yet been studied. In this study, a magnetic Fe3O4@rGO nano-composite, which could be easily removed from water with a simple magnetic separation step was synthesized and characterized. The magnetic rGO showed fast adsorption rate and high adsorption capacity towards different TPM dyes (the Langmuir monolayer adsorption capacity is 64.93 mg/g for adsorption of crystal violet). The adsorption processes are well-fitted to the pseudo-second-order kinetic model (R2 > 0.99) and the Langmuir isotherm model (R2 = 0.9996). Moreover, the magnetic rGO also showed excellent recycling and regeneration capabilities. The results indicated that adsorption with magnetic rGO would be a promising strategy to clean up the TPM contamination.

Synthesis of Phosphoric Acid /Graphene Composites for Water Purification

2013 ◽  
Vol 864-867 ◽  
pp. 1717-1720
Author(s):  
Chu Bei Wang
Keyword(s):  
Graphene Oxide ◽  
Phosphoric Acid ◽  
Adsorption Capacity ◽  
Reduced Graphene Oxide ◽  
Functional Groups ◽  
Water Purification ◽  
One Pot ◽  
Reduced Graphene ◽  
Adsorption Data

Phosphoric acid /graphene composites were synthesized by a facile one-pot method in the oil-phase. The composites produced in this study have more active groups than reduced graphene oxide. Adsorption data indicated that active groups of the material had far greater influence on the adsorption capacity than inert functional groups of reduced graphene oxide.

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