Synthesis of mesoporous MCM-41 supported reduced graphene oxide-Fe catalyst for heterogeneous Fenton degradation of phenol

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 103989-103998 ◽  
Author(s):  
Ying Wang ◽  
Yange Yu ◽  
Caolin Deng ◽  
Jinggang Wang ◽  
Bo-Tao Zhang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Heterogeneous Fenton ◽  
Fe Catalyst ◽  
Fenton Catalyst ◽  
Reduced Graphene ◽  
Heterogeneous Fenton Catalyst ◽  
Mcm 41

A new heterogeneous Fenton catalyst, rGO-Fe/MCM-41, was developed. The incorporation of rGO was benefit for the activity of the catalyst.

scholarly journals Green Synthesis of Cu Nanoparticles in Modulating the Reactivity of Amine-Functionalized Composite Materials towards Cross-Coupling Reactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2260
Author(s):  
Surjyakanta Rana ◽  
G. Bishwa Bidita Varadwaj ◽  
Sreekanth B. Jonnalagadda
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Composite Materials ◽  
Mesoporous Silica ◽  
Reduced Graphene Oxide ◽  
Coupling Reactions ◽  
Cu Nanoparticles ◽  
Amine Functionalized ◽  
Reduced Graphene ◽  
Mcm 41

Control over both dispersion and the particle size distribution of supported metal particles is of paramount importance for the catalytic activity of composite materials. We describe the synthesis of materials with Cu nanoparticles well-dispersed on different amine-functionalized supports, using the extract of Wallich Spurge as a green, reducing agent. Graphene oxide (GO), mesoporous silica (MCM-41), mesoporous zirconia, and reduced graphene oxide-mesoporous silica (RGO-MCM-41) were explored as supports. Cu nanoparticles were better stabilized on RGO-MCM-41 compared to other supports. The novel composite materials were characterized by X-ray diffraction (XRD), Raman spectra, Scanning electron microscope (SEM), Transmission electron microscopy analysis and HR-TEM. SEM and EDX techniques. High angle XRD confirmed the conversion of graphene oxide to reduced graphene oxide (RGO) with plant extract as a reducing agent. Both XRD and TEM techniques confirmed the Cu nanoparticle formation. The catalytic activity of all the prepared materials for the Ullmann coupling reactions of carbon-, oxygen-, and nitrogen-containing nucleophiles with iodobenzene was evaluated. From the results, 5 wt% Cu on amine-functionalized reduced graphene oxide/mesoporous silica nanocomposite (5 wt%Cu(0)-AAPTMS@RGO-MCM-41) exhibited excellent efficiency with 97% yield of the C-C coupling product in water at 80 °C in 5 h. The activity remained unaltered almost up to the fourth cycle. The Cu nanoparticles stabilized by organic amine group on RGO hybrid facilitated sustained activity.

scholarly journals A Novel Reduced Graphene Oxide-Attapulgite (RGO-ATP) Supported Fe2O3 Catalyst for Heterogeneous Fenton-like Oxidation of Ciprofloxacin: Degradation Mechanism and Pathway

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 189
Author(s):  
Ting Zhang ◽  
Chunyuan Qian ◽  
Pengran Guo ◽  
Shuchai Gan ◽  
Lingyu Dong ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Heterogeneous Catalyst ◽  
Photoelectron Spectroscopy ◽  
Degradation Products ◽  
Degradation Mechanism ◽  
Ion Cyclotron Resonance ◽  
Heterogeneous Fenton ◽  
X Ray ◽  
Reduced Graphene

Ciprofloxacin, a third-generation fluoroquinolones (FQs) antibiotic, is observed to increasingly pollute the environment. In this study, a three-dimensional reduced graphene oxide-attapulgite-based catalyst Fe2O3/RGO-ATP was prepared and used to analyze the degradation of ciprofloxacin in a heterogeneous Fenton reaction. The heterogeneous catalyst Fe2O3/RGO-ATP was prepared by a one-step hydrothermal method, and the samples were characterized using BET(Brunauer-Emmett-Teller) surface area, Raman spectroscopy, X-ray diffraction (XRD), Fourier infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of reaction time, temperature, pH, initial concentration, H2O2 dosage and reuse time on the degradation of ciprofloxacin by the catalyst Fe2O3/RGO-ATP was investigated. The optimum conditions of degradation of ciprofloxacin are observed to be 60 °C, pH 5, H2O2 concentration of 2.9724 mmol/L, and initial ciprofloxacin concentration of 50 mg/L. The catalyst could be reused several times with a decline in catalytic capacity. Fourier-transform ion cyclotron resonance mass spectrometer (FT) was also employed to study the degradation products of ciprofloxacin in the aqueous solution. The results show that the heterogeneous catalyst Fe2O3/RGO-ATP possessed an excellent ability for the catalytic degradation of ciprofloxacin. Direct hydroxyl oxidation is noted to be the main pathway of degradation of ciprofloxacin, and no defluorination reaction is observed during the degradation process.

An Iron Oxychloride/Reduced Graphene Oxide Heterojunction with Enhanced Catalytic Performance as a Photo-Fenton Catalyst

2018 ◽  
Vol 2018 (26) ◽  
pp. 3080-3087 ◽  
Author(s):  
Jian Zhang ◽  
Xinfu Zhao ◽  
Mingliang Zhong ◽  
Mengxue Yang ◽  
Ye Lian ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Catalytic Performance ◽  
Fenton Catalyst ◽  
Reduced Graphene
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