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Drogui, Patrick; Elmaleh, S.; Rumeau, M.; Bérnard, C.; Rambaud, Alfred

doi:10.1023/a:1017588221369

Cited by 130 publications

(52 citation statements)

References 9 publications

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“…The potential contribution of electrochemical ROS to the loss of bacterial viability was examined by measuring cathodic H 2 O 2 production. During cathodic electrolysis, H 2 O 2 can be generated by reducing dissolved oxygen (33,34), and H 2 O 2 is known to be detrimental to bacteria (35,36). To promote H 2 O 2 generation and avoid loss via reaction with bacteria or broth, the electrodes were immersed in a 0.9% NaCl saline solution that was sparged with pure oxygen in the absence of bacteria and broth.…”

mentioning

confidence: 99%

Semiquantitative Performance and Mechanism Evaluation of Carbon Nanomaterials as Cathode Coatings for Microbial Fouling Reduction

Zhang

Nghiem

Silverberg

et al. 2015

Appl Environ Microbiol

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In this study, we examine bacterial attachment and survival on a titanium (Ti) cathode coated with various carbon nanomaterials (CNM): pristine carbon nanotubes (CNT), oxidized carbon nanotubes (O-CNT), oxidized-annealed carbon nanotubes (OA-CNT), carbon black (CB), and reduced graphene oxide (rGO). The carbon nanomaterials were dispersed in an isopropyl alcoholNafion solution and were then used to dip-coat a Ti substrate. Pseudomonas fluorescens was selected as the representative bacterium for environmental biofouling. Experiments in the absence of an electric potential indicate that increased nanoscale surface roughness and decreased hydrophobicity of the CNM coating decreased bacterial adhesion. The loss of bacterial viability on the noncharged CNM coatings ranged from 22% for CB to 67% for OA-CNT and was dependent on the CNM dimensions and surface chemistry. For electrochemical experiments, the total density and percentage of inactivation of the adherent bacteria were analyzed semiquantitatively as functions of electrode potential, current density, and hydrogen peroxide generation. Electrode potential and hydrogen peroxide generation were the dominant factors with regard to short-term (3-h) bacterial attachment and inactivation, respectively. Extended-time electrochemical experiments (12 h) indicated that in all cases, the density of total deposited bacteria increased almost linearly with time and that the rate of bacterial adhesion was decreased 8-to 10-fold when an electric potential was applied. In summary, this study provides a fundamental rationale for the selection of CNM as cathode coatings and electric potential to reduce microbial fouling. Biofilm formation is ubiquitous in aquatic environments and is undesirable for industrial systems, such as heat exchangers and ship hulls (1), as well as for engineered environmental systems, such as membrane filters (2) and water distribution pipelines. A critical initial stage of biofouling involves microorganism adhesion and formation of the primary slime layer that allows for continued biofilm development (3, 4). Thus, if initial microorganism adhesion is reduced, continued biofilm development may be slowed as well.Continuous research efforts have been devoted to microbial fouling control, from the development of antimicrobial surfaces (5) to the disturbance of bacterial biofilm ecology by quorum sensing (6, 7). With regard to antimicrobial surfaces, the interfacial energy between a surface and water has been identified as a key factor in microbial adhesion, and hydrophilic surfaces generally hinder protein adsorption and, in turn, reduce biofouling (8). A highly charged cationic surface has also been demonstrated to kill bacteria and reduce fouling (9). However, since microbes have a complex and species-dependent surface chemistry, a permanently modified surface will not reduce biofouling for all microbes, and decreased antifouling performance is often observed in complex environments. One solution may be active biofouling reduction that can be tuned in situ ...

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mentioning

confidence: 99%

Semiquantitative Performance and Mechanism Evaluation of Carbon Nanomaterials as Cathode Coatings for Microbial Fouling Reduction

Zhang

Nghiem

Silverberg

et al. 2015

Appl Environ Microbiol

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“…In fact, the electrolytic cell broke the double bonds producing smaller molecules. It is worth noting that, during electrolysis, organic pollutants can be subjected to two different paths in anodic oxidation: electrochemical conversion or electrochemical combustion[32,34,51]. Electrochemical conversion only transforms the non-biodegradable organic pollutants into biodegradable compounds, whereas electrochemical combustion yields water and carbon dioxide and no further treatment is then required.…”

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confidence: 99%

In situ active chlorine generation for the treatment of dye-containing effluents

et al. 2009

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This study examined the possibility to remove colour causing-compounds from synthetic effluent by indirect electrochemical oxidation using iridium oxide anode electrodes. Using a high concentration of chloride ions (17.1 mM) and various current densities, it was possible to produce high concentration of active chlorine with a specific production rate of 2.8 mg min -1 A -1 . The best performance for acid methyl violet 2B dye (MV2B) decomposition was obtained using Ti/IrO 2 anodes operated at a current density of 15 mA cm -2 during 40 min of treatment in the presence of 3.42 mM of chloride ions. Under these conditions, more than 99% of MV2B was removed (with a reaction rate apparent constant of 0.20 min -1 ), whereas COD and TOC removal were 51% and 75%, respectively. The electrolytic cell was then used for the degradation of three other synthetic dye solutions: Eosin yellowish (EOY), Trypan Blue (TRB), Acridine Orange (ACO). TRB was the most difficult dye to remove from solution with a value reaction rate constant of 0.12 min -1 , compared to 0.19 min -1 and 0.24 min -1 recorded for ACO and EOY dyes, respectively. More than 99% of these dyes were removed by electrochemical oxidation.

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“…In our study, it included 12 experiments, where each pair of factors is linked in a 2 2 factorial (assays 1-12). Five additional assays were conducted at the center of the experimental region investigated (assays [13][14][15][16][17]. Thus, 17 runs were successively performed, and the percentage of BPA degradation (Y 1 ) varied from 22 to 97.6%.…”

Section: A Bbd For the Optimization Of Bpa Degradation During Electromentioning

confidence: 99%

“…In fact, OHÁ radicals are exclusively generated on anodes from the oxidation of water, and organic compounds can be completely transformed or degraded by reaction with adsorbed OHÁ radicals. Indirect oxidation can be achieved through the electrochemical generation of a mediator in solution (such as HClO, HBrO, H 2 O 2 , H 2 S 2 O 8 , and others) to convert toxic organics to less harmful products by using graphite or noble-metal anodes [12][13][14]. This type of technology has been widely applied using different electrode materials for the treatment of various effluents containing refractory organic compounds, including textile effluents [15], landfill leachate [16,17], olive oil wastewater, domestic sewage sludge [18], and tannery effluent [19,20].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical treatment of bisphenol-A using response surface methodology

et al. 2012

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The decomposition of bisphenol-A (BPA) in synthetic solution and in municipal effluent was investigated using an electro-oxidation process. Electrolysis was conducted using a cylindrical electrolytic cell containing two circular anodes (expanded metal) and two circular cathodes (stainless steel) alternated in the electrode pack. Different anode materials (Ti/SnO 2 , Ti/IrO 2 and Ti/PbO 2 ) were tested, and Ti/PbO 2 was found to be the most effective electrode for BPA degradation. An experimental design methodology (2 3 Box-Behnken design) was applied to determine the optimal experimental conditions in terms of cost effectiveness. The BPA concentration (C 0 = 1.0 mg l -1 ) could be optimally diminished by up to 90% by applying a current intensity of 2.0 A for a 100-min reaction period in the presence of 250 mg Na 2 SO 4 l -1 (used as a supporting electrolyte). Then, the optimal conditions were applied on a municipal wastewater effluent (sampled after secondary treatment) artificially contaminated with 1 mg BPA l -1 without the addition of a supporting electrolyte. The treatment was more effective with the municipal effluent due to the presence of a high concentration of chloride ions that could easily be transformed into active chlorine. BPA could be oxidized by both direct anodic electrochemical oxidation (by means of OHÁ) and indirect electrochemical oxidation via mediators, such as hypochlorous acid generated by chloride oxidation. Both actions (direct and indirect effects) lead to the formation of powerful oxidizing agents capable of rapidly oxidizing BPA.

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Cited by 130 publications

References 9 publications

Semiquantitative Performance and Mechanism Evaluation of Carbon Nanomaterials as Cathode Coatings for Microbial Fouling Reduction

Semiquantitative Performance and Mechanism Evaluation of Carbon Nanomaterials as Cathode Coatings for Microbial Fouling Reduction

In situ active chlorine generation for the treatment of dye-containing effluents

Electrochemical treatment of bisphenol-A using response surface methodology

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