Effective Dye Degradation by Graphene Oxide Supported Manganese Oxide

Graphene oxide (GO) was used as a support for manganese oxide (MnO2) for the preparation of a nanocomposite catalyst for the degradation of an azo dye, Reactive Black 5 (RB5). The nanocomposite was characterized for the structure by XRD, for the morphology with SEM, and for the surface chemistry with FTIR and potentiometric titration measurements. The GO-MnO2 nanocomposite presented a high catalytic activity for the degradation/oxidation of RB5 at ambient conditions, which was higher than that of the pure MnO2 and could be attributed to the beneficial contribution of the manganese oxide and the graphene oxide.

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In situ Synthesis of Reduced Graphene Oxide Supported CoMo Nanoparticles as Efficient Catalysts for Hydrogen Generation from NH3BH3

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2017-0993 ◽

2018 ◽

Vol 232 (3) ◽

pp. 431-443 ◽

Cited By ~ 10

Author(s):

Xigang Du ◽

Yonghua Duan ◽

Jun Zhang ◽

Gang Mi

Keyword(s):

Aqueous Solution ◽

Graphene Oxide ◽

Catalytic Activity ◽

Reduced Graphene Oxide ◽

Hydrogen Generation ◽

Sodium Molybdate ◽

High Catalytic Activity ◽

Ambient Conditions ◽

Reduced Graphene

AbstractCoMo nanoparticles (NPs) supported on reduced graphene oxide (RGO) were synthesized by a one-stepin situco-reduction of an aqueous solution of cobalt(II) chloride, sodium molybdate dihydrate and graphene oxide (GO) using NaBH4as the sole reductant under ambient conditions. The powder XRD, FTIR, EDS and TEM were employed to characterize the structure, size and composition of the CoMo/RGO catalysts. The as-synthesized Co0.9Mo0.1/RGO catalysts exhibited high catalytic activity for the hydrolytic dehydrogenation of ammonia borane (AB) at room temperature. The as-synthesized Co0.9Mo0.1/RGO nanocatalysts exhibited much higher catalytic activity than Co/RGO, Mo/RGO and the RGO-free Co0.9Mo0.1counterpart. Moreover, kinetic studies indicate that the catalytic hydrolysis of AB by Co0.9Mo0.1/RGO has first order kinetics with respect to the the catalyst concentration, but zero order kinetics with respect to the substrate concentration. The Co0.9Mo0.1/RGO catalyst has a turnover frequency (TOF) of 15.8 mol H2·(mol·Co0.9Mo0.1/RGO)−1·min−1at 25°C. Furthermore, the Co0.9Mo0.1/RGO show good recyclability for hydrogen generation from an aqueous solution of AB, which enables the practical reuse of the catalysts. Hence, this general method can be easily extended to the facile preparation of other RGO-based metallic systems.

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Synthesis and characterization of alkali metal molybdates with high catalytic activity for dye degradation

RSC Advances ◽

10.1039/c6ra12437b ◽

2016 ◽

Vol 6 (59) ◽

pp. 54553-54563 ◽

Cited By ~ 6

Author(s):

Yili Zhang ◽

Zhang Zhang ◽

Tuantuan Zhou ◽

Peng Lu ◽

Yanshan Gao ◽

...

Keyword(s):

Catalytic Activity ◽

Alkali Metal ◽

Dye Degradation ◽

Cationic Dyes ◽

Synthesis And Characterization ◽

High Catalytic Activity ◽

Ambient Conditions

In this contribution, the synthesis and catalytic activity of alkali metal molybdates for the degradation of cationic dyes under ambient conditions were systematically studied.

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Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

10.26434/chemrxiv.8289812 ◽

2019 ◽

Author(s):

Du Sun ◽

yunfei wang ◽

Kenneth Livi ◽

chuhong wang ◽

ruichun luo ◽

...

Keyword(s):

Catalytic Activity ◽

Diffusion Mechanism ◽

Reduction Reaction ◽

Atomic Scale ◽

High Catalytic Activity ◽

Ambient Conditions ◽

Magnetic Devices ◽

Disordered Alloys ◽

Ordered Intermetallic ◽

Intermetallic Nanoparticles

<div> The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi2 to ordered intermetallic Pd3Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi2 corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd3Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions. </div>

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Corrigendum to “Monodisperse palladium nanoparticles assembled on graphene oxide with the high catalytic activity and reusability in the dehydrogenation of dimethylamine-borane” [Int J Hydrogen Energy 43 (2018) 20176–20182]

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2021.04.165 ◽

2021 ◽

Author(s):

Betül Şen ◽

Ayşenur Aygün ◽

Tugba Onal Okyay ◽

Aysun Şavk ◽

Remziye Kartop ◽

...

Keyword(s):

Graphene Oxide ◽

Catalytic Activity ◽

Palladium Nanoparticles ◽

High Catalytic Activity ◽

Hydrogen Energy ◽

Dimethylamine Borane

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Degradation of an Azo Dye by Fenton Type Processes Assisted with UV Irradiation

International Journal of Chemical Reactor Engineering ◽

10.2202/1542-6580.1462 ◽

2007 ◽

Vol 5 (1) ◽

Cited By ~ 3

Author(s):

Natalija Koprivanac ◽

Dinko Vujevic

Keyword(s):

Uv Irradiation ◽

Azo Dye ◽

Dye Degradation ◽

Degradation Products ◽

Batch Reactor ◽

Process Efficiency ◽

Molar Ratio ◽

Synthetic Dyes ◽

Ambient Conditions ◽

Treatment Methods

Organic synthetic dyes are widely produced and used today. Significant losses of organic and inorganic content occurs during the manufacturing and application of dyes and its discharge in the effluent presents a threat to the eco-systems due to general toxicity and resistance to destruction by biological treatment methods. Particularly azo dyes are of special environmental concern due to their degradation products such as aromatic amines, which are considered highly carcinogenic. So, dyes have to be removed from coloured wastewater before discharge. However, traditional treatment methods (adsorption, coagulation/flocculation) mainly transfer the contaminants from wastewater to secondary waste. Therefore, advanced oxidation processes seem to be sustainable and clean technology to decolorize and minimize organic dyes content from wastewater. In this paper, degradation of an azo dye C.I. Direct Orange 39 (DO39) using Fenton type processes (Fe2+/H2O2, Fe3+/H2O2and Fe0/H2O2) has been performed. The molar ratio of Fentons type reagents has been varied in the range of 1 : 5 up to 1 : 50 at 0.5 and 1.0 mM concentrations of iron salts and iron powder. Experiments have been conducted for two hours in a batch reactor with magnetic stirring, ambient conditions and pH 3. The process efficiency and formation of degradation by-products have been determined on the basis of results obtained by UV/VIS spectrophotometric, total organic carbon (TOC) and high performance liquid chromatography (HPLC) analyses. The optimal Fenton and Fenton ``like" processes parameters have been applied in the photo reactor, too. It has been observed that simultaneous utilization of UV irradiation with Fenton's and Fenton ``like" reagents increases the degradation of DO39 dye. Degradation of the dye in dilute aqueous solution follows pseudo-first order kinetics. The maximal decolourization of 20 mg L-1 DO39 in water of 93.2% and TOC degradation of 76.9% were obtained using Fe3+/H2O2= 1 : 5 molar ratio. The results indicate that the treatment of DO39 dye wastewater with UV/Fe3 +/H2O2 system was found to be the most efficient.

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Mussel-inspired construction of thermo-responsive double-hydrophilic diblock copolymers-decorated reduced graphene oxide as effective catalyst supports for highly dispersed superfine Pd nanoparticles

Nanoscale ◽

10.1039/c8nr02719f ◽

2018 ◽

Vol 10 (26) ◽

pp. 12487-12496 ◽

Cited By ~ 13

Author(s):

Haichao Duan ◽

Yu Yang ◽

Jianhua Lü ◽

Changli Lü

Keyword(s):

Graphene Oxide ◽

Catalytic Activity ◽

Reduced Graphene Oxide ◽

Diblock Copolymer ◽

Diblock Copolymers ◽

Pd Nanoparticles ◽

Catalyst Supports ◽

High Catalytic Activity ◽

Reduced Graphene ◽

Highly Dispersed

We report a facile, mussel-inspired construction of a thermo-responsive diblock copolymer-anchored rGO support for superfine PdNPs with high catalytic activity.

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PtAu alloy nanoparticles supported on thermally expanded graphene oxide as a catalyst for the selective oxidation of glycerol

RSC Advances ◽

10.1039/c5ra04048e ◽

2015 ◽

Vol 5 (47) ◽

pp. 37112-37118 ◽

Cited By ~ 15

Author(s):

Gao-Yuan Yang ◽

Shuai Shao ◽

Yi-Hu Ke ◽

Chun-Ling Liu ◽

Hui-Fang Ren ◽

...

Keyword(s):

Aqueous Solution ◽

Graphene Oxide ◽

Catalytic Activity ◽

Selective Oxidation ◽

High Catalytic Activity ◽

Alloy Nanoparticles

Thermally expanded graphene oxide supported PtAu alloy nanoparticles showed high catalytic activity in the oxidation of glycerol in base-free aqueous solution.

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Correction: Facile preparation of reduced graphene oxide supported PtNi alloyed nanosnowflakes with high catalytic activity

RSC Advances ◽

10.1039/c5ra90047f ◽

2015 ◽

Vol 5 (57) ◽

pp. 45641-45641

Author(s):

Pei Song ◽

Jiu-Ju Feng ◽

Shu-Xian Zhong ◽

Su-Su Huang ◽

Jian-Rong Chen ◽

...

Keyword(s):

Graphene Oxide ◽

Catalytic Activity ◽

Reduced Graphene Oxide ◽

High Catalytic Activity ◽

Reduced Graphene ◽

Facile Preparation

Correction for ‘Facile preparation of reduced graphene oxide supported PtNi alloyed nanosnowflakes with high catalytic activity’ by Pei Song et al., RSC Adv., 2015, 5, 35551–35557.

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A facile construction of Au nanoparticles on a copolymer ligand brushes modified graphene oxide nanoplatform with excellent catalytic properties

RSC Advances ◽

10.1039/c6ra11710d ◽

2016 ◽

Vol 6 (69) ◽

pp. 64937-64945 ◽

Cited By ~ 9

Author(s):

Yajiao Song ◽

Jianhua Lü ◽

Bingxin Liu ◽

Changli Lü

Keyword(s):

Graphene Oxide ◽

Catalytic Activity ◽

Au Nanoparticles ◽

Catalytic Properties ◽

High Catalytic Activity ◽

Au Nps ◽

Modified Graphene Oxide ◽

Modified Graphene ◽

Copolymer Brush

Au NPs were generated via in situ reduction on copolymer brush P(OEGMA-co-MQ) functionalized GO. MQ units in the brushes as capping agents could stabilize the Au NPs. The Au NPs–GO hybrid exhibited high catalytic activity for the reduction of 4-NP.

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