Physico-chemical properties of pristine graphene and its performance as electrode material for electro-Fenton treatment of wastewater

Mousset, Emmanuel; Wang, Zuxin; Hammaker, Joshua; Lefebvre, Olivier

doi:10.1016/j.electacta.2016.08.002

Cited by 95 publications

(91 citation statements)

References 60 publications

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“…Two methods were used in the electrochemical analysis: we plotted the cathodic voltammetric curves of the electrode surfaces obtained during the EF treatment and the H 2 O 2 productivity was measured in linear sweep voltammetry (LSV) analysis. Cyclic voltammetry (CV) was used to calculate the reactive area of the electrode, based on the methods of Mousset et al [ 24 ] and the Randles-Sevcik equation [ 25 , 26 ]; the simplified form of this equation is shown in Equation (4), which consists of the key factors ( D , n , C , γ ) in the CV test.

where I p : peak current; A : the reactive surface area of the electrode; D : diffusion coefficient of the analytes; n : number of electrons participating in the redox reaction; γ : scan rate; C : concentration.…”

Section: Methodsmentioning

confidence: 99%

Study on the Performance of Nano-Titanium Nitride-Coated Stainless Steel Electrodes in Electro-Fenton Systems

Wang

Lin

2018

Nanomaterials

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The electro-Fenton (EF) process is a type of electrochemical oxidation process; ·OH radicals are generated on the cathode using electricity and decolorize dye wastewaters. Most studies on EF systems in the past have focused on the operating parameters of this process. In recent years, the influence of electrode performance on the EF process has begun to receive more attention. In this study, direct nitridation was used to prepare titanium nitride powders, which were thereafter coated on an SUS304 stainless steel substrate. The performance of this system in the treatment of rhodamine B dye wastewaters via the EF process was investigated. The experimental methods used in this work include: (1) scanning electron microscopy (SEM); (2) X-ray diffraction (XRD); (3) electrochemical Tafel curves; (4) linear sweep voltammetry (LSV); (5) and cyclic voltammetry (CV). It was shown that high-purity TiN can be formed at nitriding temperatures above 900 °C, and the strength of the (111) crystal plane increases with the increase in nitriding temperature; the TiN coating effectively activates the reactive surface of the electrode owing to its porous structure. In terms of corrosion resistance, the corrosion potential and corrosion current of the TiN 1000 °C/SUS304 electrode were 116.94 mV and 205 nA/cm2, respectively, and the coating had a coating porosity of 0.89 × 10−7. As compared with SUS304 stainless steel, the TiN 1000 °C/SUS304 composite electrode had a significantly greater degree of corrosion resistance and exhibited higher redox activity in LSV tests. This composite electrode could achieve a decolorization rate of 49.86% after 30 min, and 94.46% after 120 min. In summary, the TiN 1000 °C/SUS304 composite electrode is very stable and has excellent decolorization efficacy in the EF process. Our findings will serve as a useful reference for future studies on EF electrodes.

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Section: Methodsmentioning

confidence: 99%

Study on the Performance of Nano-Titanium Nitride-Coated Stainless Steel Electrodes in Electro-Fenton Systems

Wang

Lin

2018

Nanomaterials

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“…Electrochemical AOPs are magnetizing many of the awareness, thanks to their numerous benefits, comprising employing a more hygienic reagent (electricity), potential to attain outstanding levels of mineralization, versatility, elevated energy effectiveness [45], amenability of automation and safety [46] [47] [48] [49]. As shown in Table 1, electro-Fenton is fast rising as the most encouraging between electrochemical techniques [50] [51], particularly via the integration with nanomaterials like graphene [52] [53] or boron-doped diamond (BDD) to boost anodic oxidation as an extra source of • OH [3] [54].…”

Section: Electrochemical Technologiesmentioning

confidence: 99%

Direct Potable Reuse: The Singapore NEWater Project as a Role Model

Ghernaout¹,

Elboughdiri²,

Alghamdi³

2019

OALib

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In Singapore, indirect potable water reuse has been applied during the last two decades. Now, water reuse furnishes around 30% of the nation's water request and the well-known NEWater success story has greatly participated in transforming Singapore into a global hydro hub for pioneering novel water techniques. This work discusses the recent technological improvements and the outlooks for water reuse in Singapore as a model. Fields of attentions comprise membrane exploitation (involving forward, reverse and pressure retarded osmosis, as well as membrane bioreactors), advanced oxidation processes, electrochemical methods, and their combination as cost-effective tailored solutions to tackle novel dares as diverse as direct potable reuse. The challenge is to duplicate the Singapore NEWater success story throughout the world. Efforts should be accomplished to generalize such encouraging and rich experience especially in poor countries where humans are dying because of lack of water or due to diseases caused by contaminated water.

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“…Mousset et al used graphene with 2D structures and graphene foam with 3D structures as electrodes to treat phenol in the electro-Fenton system. The results showed that for the graphene foam with a porous structure and high specific surface area, the phenol degradation was 2.5 times higher than that of the graphene with a 2D structure [17]. In summary, the combination of CNTs and graphene can change the morphology of the electrode material they are deposited on and influence the properties of the electrode.…”

Section: Introductionmentioning

confidence: 99%

Application of Graphene and Carbon Nanotubes on Carbon Felt Electrodes for the Electro-Fenton System

Wang

Lin

2019

Materials

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The electro-Fenton system has the ability to degrade wastewater and has received attention from many researchers. Currently, the core development objective is to effectively increase the degraded wastewater decolorization efficiency in the system. In this study, to improve the electro-Fenton system reaction rate and overall electrical properties, we used polyvinylidene difluoride to fix carbon nanotubes (CNTs) and graphene onto the system cathode (carbon felt electrode), which was then used to process Reactive Black 5 wastewater. Furthermore, we (1) used scanning electron microscopy to observe the structural changes in the electrode surface after modification; (2) used the Tafel curve to determine the electrode corrosion voltage and corrosion rate; and (3) analyzed the azo-dye decolorization level. The results showed that the maximum system decolorization rates of the CNT- and graphene-modified carbon felt electrodes were 55.3% and 70.1%, respectively. These rates were, respectively, 1.2 and 1.5 times higher than that of the unmodified carbon felt electrode, implying that we successfully improved the cathode characteristics. The modified electrode exhibited an improved conductivity and corrosion resistance, which, in turn, improved the system decolorization efficiency. This significantly increased the electro-Fenton system overall efficacy, making it valuable for future applications.

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Physico-chemical properties of pristine graphene and its performance as electrode material for electro-Fenton treatment of wastewater

Cited by 95 publications

References 60 publications

Study on the Performance of Nano-Titanium Nitride-Coated Stainless Steel Electrodes in Electro-Fenton Systems

Study on the Performance of Nano-Titanium Nitride-Coated Stainless Steel Electrodes in Electro-Fenton Systems

Direct Potable Reuse: The Singapore NEWater Project as a Role Model

Application of Graphene and Carbon Nanotubes on Carbon Felt Electrodes for the Electro-Fenton System

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