Metal‐Free Heterogeneous Catalysis for Sustainable Chemistry

Su, Dang Sheng; Zhang, Jian; Frank, Benjamin; Thomas, Arne; Wang, Xinchen; Paraknowitsch, Jens Peter; Schlögl, Robert

doi:10.1002/cssc.200900180

Cited by 565 publications

(398 citation statements)

References 133 publications

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“…4, the representative AFM image shows a uniform thickness of about 0.38 nm. This thickness agrees well with the theoretical values of single-layer carbon nitride (0.324 nm) [14,15]. This can be used as a strong evidence for the presence of g-C3N4 nanosheets in the presence of monatomic layers in mixed solvents.…”

Section: Characterization Of Physiochemical Properties Of G-c 3 N 4 Nsupporting

confidence: 89%

Direct Exfoliation of g-C3N4 with Addition of NaOH for Enhanced Photocatalytic Cr(Ⅵ) Reduction

Guo¹,

Sun²,

Chang³

et al. 2018

Preprint

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A simple, effective and environmental-friendly method was adopted for enhancing the photocatalytic activity of g-C3N4 in the reduction of aqueous Cr(Ⅵ) under visible-light irradiation. The enhancement was achieved via treatment of g-C3N4 in organic solvent with addition of NaOH particles by ultrasonic process for two hours.The results demonstrated that the treated g-C3N4 exhibited much higher photocatalytic activity than pristine g-C3N4 in the reduction of Cr(VI) . Under visible light irradiation for 120 min, the reduced ratios of Cr(VI) with the initial concentration of 50 mg/L in the presence of the treated g-C3N4and pristine g-C3N4 were 100% and 37.1%, respectively. With the addition of fulvic acid, Cr(VI) was efficiently removed at 40 min. Based on the characterization results of the structures and other physiochemical properties of the treated g-C3N4 and pristine g-C3N4 by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV Vis diffuse reflectance, the possible reasons responsible for the enhanced photocatalytic activity of the treated g-C3N4 were proposed. The yield and mechanism of different exfoliation methods were compared by semi-quantitative method.

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Section: Characterization Of Physiochemical Properties Of G-c 3 N 4 Nsupporting

confidence: 89%

Direct Exfoliation of g-C3N4 with Addition of NaOH for Enhanced Photocatalytic Cr(Ⅵ) Reduction

Guo¹,

Sun²,

Chang³

et al. 2018

Preprint

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show abstract

“…Recently, it was reported that metals as catalyst in ORR only promote the formation of active sites and have no role in catalytic function [77]. Chemically modified carbon-based materials including carbon nanotubes, graphene, graphite foam can be used as catalyst for ORR [78,79]. ORR can proceed to four electron pathway using a nitrogen incorporated catalysts [80][81][82].…”

Section: Cathode With Metal-free Catalystmentioning

confidence: 99%

Electrode materials for microbial fuel cells: nanomaterial approach

Mustakeem

2015

Mater Renew Sustain Energy

207

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Microbial fuel cell (MFC) technology has the potential to become a major renewable energy resource by degrading organic pollutants in wastewater. The performance of MFC directly depends on the kinetics of the electrode reactions within the fuel cell, with the performance of the electrodes heavily influenced by the materials they are made from. A wide range of materials have been tested to improve the performance of MFCs. In the past decade, carbon-based nanomaterials have emerged as promising materials for both anode and cathode construction. Composite materials have also shown to have the potential to become materials of choice for electrode manufacture. Various transition metal oxides have been investigated as alternatives to conventional expensive metals like platinum for oxygen reduction reaction. In this review, different carbon-based nanomaterials and composite materials are discussed for their potential use as MFC electrodes.

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“…The use of carbon catalysts is attractive in this regard because of their low cost and natural abundance [4][5][6][7][8] . Carbocatalysis is well established in the oxidative dehydrogenation of ethylbenzene to produce styrene 4 . Oxidative aromatization involving a molecular oxygen and activated carbon system has also been used to prepare aromatic compounds such as pyrazoles, pyridine, indoles and so on 8 .…”

mentioning

confidence: 99%

Probing the catalytic activity of porous graphene oxide and the origin of this behaviour

et al. 2012

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Graphene oxide, a two-dimensional aromatic scaffold decorated by oxygen-containing functional groups, possesses rich chemical properties and may present a green alternative to precious metal catalysts. Graphene oxide-based carbocatalysis has recently been demonstrated for aerobic oxidative reactions. However, its widespread application is hindered by the need for high catalyst loadings. Here we report a simple chemical treatment that can create and enlarge the defects in graphene oxide and impart on it enhanced catalytic activities for the oxidative coupling of amines to imines (up to 98% yield at 5 wt% catalyst loading, under solvent-free, open-air conditions). This study examines the origin of the enhanced catalytic activity, which can be linked to the synergistic effect of carboxylic acid groups and unpaired electrons at the edge defects. The discovery of a simple chemical processing step to synthesize highly active graphene oxide allows the premise of industrial-scale carbocatalysis to be explored.

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Metal‐Free Heterogeneous Catalysis for Sustainable Chemistry

Cited by 565 publications

References 133 publications

Direct Exfoliation of g-C3N4 with Addition of NaOH for Enhanced Photocatalytic Cr(Ⅵ) Reduction

Direct Exfoliation of g-C3N4 with Addition of NaOH for Enhanced Photocatalytic Cr(Ⅵ) Reduction

Electrode materials for microbial fuel cells: nanomaterial approach

Probing the catalytic activity of porous graphene oxide and the origin of this behaviour

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