Synthesis of disodium phosphonate functionalized graphene oxide as an efficient heterogeneous nanocatalyst for mercaptan removal from the gas stream

Mercaptans are commonly present in natural gas. Their high corrosiveness make them the most undesirable sulfur compounds, so they should be removed because of harmful effects on the environment. Disodium phosphonate functionalized graphene oxide (GO-P(Na)2) nanocatalyst was synthesized and adsorption of mercaptan on nanocatalyst was studied in this work. The nanocatalyst was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy analysis. The experiments were carried out in a fixed-bed reactor and the effect of temperature and Gas Hour Space Velocity (GHSV) parameters on mercaptan removal under nanocatalyst were investigated, demonstrating that increasing the temperature and decreasing the GHSV improves the rate of the reaction. Moreover, the kinetic parameters relevant to catalytic reaction for mercaptan removal under nanocatalyst were reported. The experimental results displayed that the maximum of mercaptan removal was obtained under GO-P(Na)2 nanocatalyst at the temperature of 100∘C and GHSV of 1000[Formula: see text]h[Formula: see text]. The concentration of output mercaptan under nanocatalyst reduced from 16,800[Formula: see text]ppm to less than 25[Formula: see text]ppm.

Download Full-text

Synthesis and Characterization of Graphene Thin Films by Chemical Reduction of Exfoliated and Intercalated Graphite Oxide

Journal of Chemistry ◽

10.1155/2013/150536 ◽

2013 ◽

Vol 2013 ◽

pp. 1-6 ◽

Cited By ~ 87

Author(s):

F. T. Thema ◽

M. J. Moloto ◽

E. D. Dikio ◽

N. N. Nyangiwe ◽

L. Kotsedi ◽

...

Keyword(s):

Graphene Oxide ◽

Chemical Reduction ◽

Reduction Process ◽

Colloidal Dispersion ◽

Functionalized Graphene ◽

X Ray Diffraction ◽

Functionalized Graphene Oxide ◽

Force Microscopy ◽

Atomic Force ◽

Polar Aprotic Solvent

Commercial flakes of graphite were prepared into functionalized graphene oxide (GO) by chemical treatment. After the exfoliation and intercalation of graphene into functionalized graphene oxide that formed stable colloidal dispersion in polar aprotic solvent, the reduction process was undertaken by continuous stirring with hydrazine hydrate. The reduced material was characterized by X-ray diffraction (XRD), attenuated total reflectance (ATR) FT-IR, ultraviolet visible (UV-vis), atomic force microscopy (AFM) and Raman spectroscopy which confirm the oxidation of graphite and reduction of graphene oxide into graphene sheet.

Download Full-text

An Electrochemical Sensor Based on Gold and Bismuth Bimetallic Nanoparticles Decorated L-Cysteine Functionalized Graphene Oxide Nanocomposites for Sensitive Detection of Iron Ions in Water Samples

Nanomaterials ◽

10.3390/nano11092386 ◽

2021 ◽

Vol 11 (9) ◽

pp. 2386

Author(s):

Na Zhou ◽

Jing Li ◽

Shaoxia Wang ◽

Xuming Zhuang ◽

Shouqing Ni ◽

...

Keyword(s):

Graphene Oxide ◽

Electrochemical Sensor ◽

Photoelectron Spectroscopy ◽

Bimetallic Nanoparticles ◽

Functionalized Graphene ◽

X Ray Diffraction ◽

Functionalized Graphene Oxide ◽

Glassy Carbon Electrodes ◽

X Ray ◽

Seawater Samples

In this work, gold and bismuth bimetallic nanoparticles decorated L-cysteine functionalized graphene oxide nanocomposites (Au-BiNPs/SH-GO) were prepared and applied to selective detection of Fe(III) in lake and seawater samples by modifying onto glassy carbon electrodes. Bimetallic nanoparticles have various excellent properties and better catalytic properties because of the unique synergistic effect between metals. The modified electrode was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. Under optimized conditions, current peak intensity increased linearly with increasing Fe(III) concentration over the range of 0.2–50 μM and a detection limit of 0.07 μM (S/N = 3). The Au-BiNPs/SH-GO/GCE was used for the determination of Fe(III) in lake and seawater samples with recoveries ranged from 90 to 103%. Those satisfactory results revealed the potential application of the Au-BiNPs/SH-GO electrochemical sensor for heavy metals detection in environmental monitoring.

Download Full-text

Hydro-treating and Hydro-isomerisation of Sunflower Oil using Pt/SAPO-11: Influence of Templates in Ultrasonic Assisted with Hydrothermal Synthesis

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.16.1.9889.120-135 ◽

2021 ◽

Vol 16 (1) ◽

pp. 120-135

Author(s):

Shanmugam Palanisamy ◽

Durona Palanisamy ◽

Mugaishudeen Gul ◽

Kannan Kandasamy ◽

Borje Sten Gevert

Keyword(s):

Hydrothermal Treatment ◽

Sunflower Oil ◽

Synthesis Method ◽

Fixed Bed ◽

Space Velocity ◽

Major Effect ◽

Fixed Bed Reactor ◽

X Ray Diffraction ◽

Structure Directing Agent ◽

Ultrasonic Assisted

Pt/SAPO-11 mesopores type materials has successfully synthesized using different templates, such as: diethylamine (DEA), dimethylamine (DMA), and n-propylamine (n-PA), under ultrasonication coupled with hydrothermal treatment or independently with hydrothermal treatment. The influences of structure directing agent (SDA) and synthesis method are investigated by different characterization techniques and the role of the material as catalyst in hydrotreating of sunflower oil has examined. The synthesized materials have been characterized by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Fourier Transform Infra Red (FT-IR) techniques. It is found that SAPO-11 material which has synthesized with n-PA as a template has the characteristics of high silicon incorporation. Hydrotreating of sunflower oil is carried out in a fixed bed reactor with Pt impregnated SAPO-11 catalyst and a detailed study on the isomerization is performed by varying the operating parameters like temperature and space velocity. The high selectivity of Pt/SAPO-11 catalyst is achieved by uniform pore size and acidity. Also the pore opening of the catalyst has a major effect in the selectivity of the catalyst. Further, it represents a higher ratio of isomers compared to other synthesized catalysts on hydro-treating of sunflower oil. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Download Full-text

Preparation and Characterization of 3-Glycidoxypropyltrimethoxysilane Functionalized Graphene Oxide

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.814.112 ◽

2019 ◽

Vol 814 ◽

pp. 112-117

Author(s):

Kun Yan Wang

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Hydroxyl Group ◽

Functionalized Graphene ◽

X Ray Diffraction ◽

Functionalized Graphene Oxide ◽

X Ray ◽

Transmission Electron ◽

Low Degree

The graphene oxide (GO) was prepared by the Hummers method, and then functionalized by 3-glycidoxypropyltrimethoxysilane. Functionalized graphene oxide (FGO) was characterized by using Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetric analysis (TG). The results show that 3-glycidoxypropyltrimethoxysilane reacted with hydroxyl group of graphene oxide. The FGO have a sheet-like structure with wrinkles. The shifts of XRD peaks to low degree for FGO indicate the occurrence of intercalation of 3-glycidoxypropyltrimethoxysilane and as well as increase in the thermal stability.

Download Full-text