Kinetics and thermodynamics studies for bisphenol S adsorption on reduced graphene oxide

The enhancement of corrosion protection of metals and alloys by coating with simple, low cost, and highly adhered layer is still a main goal of many workers. In this research graphite flakes converted into graphene oxide using modified Hammers method and then reduced graphene oxide was electrodeposited on stainless steel 316, copper, and aluminum for corrosion protection application in seawater at four temperatures, namely, 20, 30, 40, and 50°C. All corrosion measurements, kinetics, and thermodynamics parameters were established from Tafel plots using three-electrode potentiostat. The deposited films were examined by FTIR, Raman, XRD, SEM, and AFM techniques; they revealed high percentages of conversion to the few layers of graphene with confirmed defects.

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Removal of Tetracycline Pollutants by Adsorption and Magnetic Separation Using Reduced Graphene Oxide Decorated with α-Fe2O3 Nanoparticles

Nanomaterials ◽

10.3390/nano9030313 ◽

2019 ◽

Vol 9 (3) ◽

pp. 313 ◽

Cited By ~ 13

Author(s):

Adriana Huízar-Félix ◽

Celia Aguilar-Flores ◽

Azael Martínez-de-la Cruz ◽

José Barandiarán ◽

Selene Sepúlveda-Guzmán ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Adsorption Kinetics ◽

Hybrid Material ◽

Photoelectron Spectroscopy ◽

Ferromagnetic Behavior ◽

Fe2o3 Nanoparticles ◽

X Ray ◽

Transmission Electron ◽

Reduced Graphene

Nanocomposites of reduced graphene oxide (RGO) with ferromagnetic α-Fe2O3 nanoparticles have been prepared in-situ by thermal treatment. The structure and morphology of the hybrid material were studied by X-ray photoelectron spectroscopy, Raman, X-ray diffraction, and transmission electron microscopy. The results show a hybrid material highly modified with α-Fe2O3 nanoparticles distributed on the graphene surface. The adsorption kinetics show the presence of α-Fe2O3 nanoparticles on the RGO surface, and the amount of remaining functional groups dominated by ionization and dispersion. The adsorption kinetics of this adsorbent was characterized and found to fit the pseudo-second-order model. The α-Fe2O3 nanoparticles on RGO modify the electrostatic interaction of RGO layers and tetracycline, and adsorption properties decreased in the hybrid material. Adsorption isotherms fit with the Langmuir model very well, and the maximum capacity adsorption was 44.23 mg/g for RGO and 18.47 mg/g for the hybrid material. Magnetic characterization of the hybrid material shows ferromagnetic behavior due to the nanosize of α-Fe2O3 with a saturation magnetization, Ms = 7.15 Am2/kg, a remanence Mr = 2.29 Am2/kg, and a coercive field, Hc = 0.02 T.

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Adsorption of Ammonium Ions onto ACTF-Coated Silica Nanoparticles in Comparison with Reduced Graphene Oxide and Studying Its Equilibrium, Kinetics and Thermodynamics

Advanced Science Engineering and Medicine ◽

10.1166/asem.2019.2428 ◽

2019 ◽

Vol 11 (9) ◽

pp. 866-878

Author(s):

Mohamed A. Zayed ◽

Mahmoud Fathy

Keyword(s):

Graphene Oxide ◽

Silica Nanoparticles ◽

Reduced Graphene Oxide ◽

Ammonium Ions ◽

Kinetics And Thermodynamics ◽

Reduced Graphene

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Synthesis of Reduced Graphene Oxide for Helianthine Removal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.1713 ◽

2013 ◽

Vol 864-867 ◽

pp. 1713-1716

Author(s):

Chu Bei Wang

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Adsorption Kinetics ◽

Adsorption Process ◽

Intraparticle Diffusion ◽

Second Order ◽

High Adsorption ◽

Reduced Graphene ◽

Adsorption Data ◽

High Adsorption Capacity

Reduced graphene oxide was synthesized by a facile method. Adsorption data indicated that reduced graphene oxide had high adsorption capacity. The adsorption kinetics was modeled by first-and second-order rates, as well as using the Elovich and the Weber and Morris models of intraparticle diffusion. The adsorption process follows second order rate.

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