Role of the intrinsic properties of partially reduced graphene oxides on the chemical transformation of iopromide

Toral-Sánchez, Eduardo; Ascacio-Valdés, Juan A.; Aguilar, Cristóbal N.; Cervantes, Francisco J.; Rangel-Mendez, J. Rene

doi:10.1016/j.carbon.2015.12.067

Cited by 33 publications

(47 citation statements)

References 83 publications

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“…It also could be feasible that the graphitic network within the carbon-based materials promoted enhanced electron transfer as suggested previously. 28,29 The present study also revealed that engineered conductive materials, such as those synthesized here by cold oxygen plasma, could be applied in WWTP to prevent N 2 O emissions, which are very common in full-scale denitrifying processes. 11 Certainly, application of oxidized carbonaceous material to sludge incubations greatly enhanced the N 2 O reduction rate, which otherwise was marginal in the absence of this conductive material (Table 4; Fig.…”

Section: Discussionmentioning

confidence: 54%

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Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations

Velasco‐Maldonado

Pat-Espadas

Cházaro-Ruiz

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Conductive materials, such as activated carbon (AC), graphene and biochar, have recently been applied for enhancing methane (CH4) production in anaerobic digesters. However, few efforts have been made to develop engineered conductive materials for these purposes. The aim of this work was to synthesize carbon materials from pecan nut shells and peach stones to apply them in anaerobic sludge incubations for enhancing the methanogenic activity, as well as the reduction of nitrous oxide (N2O). RESULT Addition of conductive materials increased up to six‐fold the maximum CH4 production rate. Moreover, oxidation of these carbon materials with cold oxygen plasma enriched their surface with redox functional groups (e.g. quinones), so that their application further increased the methanogenic production rate up to 11‐fold as compared to controls lacking conductive materials. Furthermore, the reduction rate of N2O was increased several orders of magnitude in the presence of synthesized carbon materials, which constitutes the first demonstration that conductive materials can significantly increase the reduction rate of this greenhouse gas. CONCLUSION Results indicate that there is great potential to develop engineered conductive materials to enhance both the production of CH4 and the reduction of N2O from wastewater treatment plants (WWTP), which may contribute to achieve more efficient processes. © 2019 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 54%

“…The redox‐mediating capacity of the conductive materials could be associated with the oxygenated functional groups, which were enriched during the oxidation process with cold oxygen plasma. It also could be feasible that the graphitic network within the carbon‐based materials promoted enhanced electron transfer as suggested previously …”

Section: Discussionmentioning

confidence: 76%

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations

Velasco‐Maldonado

Pat-Espadas

Cházaro-Ruiz

et al. 2019

J of Chemical Tech & Biotech

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“…Moreover, the results pointed out that the higher the reduction degree of rGO, the higher the reduction rate observed in the studied pollutants, and suggested that the enrichment of carbonyl groups in rGO might be responsible for the enhanced degradation observed. 15,16 In all the previously discussed cases, the contaminants, as well as the substrates, were soluble. Therefore, it is necessary to investigate what happens when particulate matter serves as substrate, since previous results have indicated that GO wraps starch granules and therefore prevents its hydrolysis.…”

Section: Introductionmentioning

confidence: 90%

“…Reduction of GO was carried out according to Toral-Sánchez et al 15 Briefly, 10 mL of GO solution (0.1 mg/mL) and 100 mg of ascorbic acid were placed in a 30 mL beaker. Immediately, samples were vigorously stirred at room temperature.…”

Section: Chemical Reduction Of Gomentioning

confidence: 99%

Methane production enhanced by reduced graphene oxide in an anaerobic consortium supplied with particulate and soluble substrates

Bueno-López

Díaz‐Hinojosa

Rangel-Méndez

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Graphene materials have extensively been applied in several industries due to their enhanced properties. Predictably, these materials also end up in wastewaters generated from industrial sectors, and their effects on biological treatment systems are poorly understood. The aim of the present study was to assess the acute effects of graphene oxide (GO) with three different degrees of reduction [reduced GO (rGO) produced with reduction times of 1, 2, and 4 h] on the methane production of an anaerobic consortium. RESULTS: Synthesized rGO materials had a stimulatory effect increasing the maximum methanogenic activity (MMA) up to 14% and 114% when glucose and starch were provided as substrates, respectively, as compared to the MMA achieved in controls incubated in the absence of rGO. Reduction of GO promoted physical-chemical changes in its structure, such as the removal of epoxy groups, which prevented grapping of starch granules by the produced rGO sheets and triggered a better interaction between the latter and microorganisms. Furthermore, this work showed that rGO stimulated starch disintegration into its components, thus accelerating its hydrolysis, which was ultimately reflected in a higher MMA when this particulate polymer was used as substrate. CONCLUSION: This study reports for the first time the acute effects of rGO on the methanogenic activity of an anaerobic consortium supplied with both soluble and particulate substrates. This information is relevant to elucidate the effects of this graphene material in anaerobic microorganisms and to improve the performance of anaerobic systems during the treatment of industrial wastewaters.

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“…Both oxidized carbon fiber 22 and hydrogen pretreated activated carbon 16 have been found to be able to enhance the capacity for biological azo dye removal. Toral-Sánchez et al probed the effect of surface chemistry of graphene oxide by oxidation and thermal treatment on iopromide reduction but in a pure chemical system 23 . Table S1 summarized the previous studies to investigate the influence of carbon materials and their surface modification on the reduction of recalcitrant contaminants.…”

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confidence: 99%

Facilitated biological reduction of nitroaromatic compounds by reduced graphene oxide and the role of its surface characteristics

Liu

Wang

et al. 2016

Sci Rep

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How reduced graphene oxide (RGO) mediates the reductive transformation of nitroaromatic pollutants by mixed cultures and the role of its surface characteristics were evaluated in this study. Different electron donors were applied to investigate the interaction between RGO and anaerobic microbes. Moreover, the influence of the surface properties of RGO on biological nitroaromatic removal was further elucidated. The results show that RGO could achieve an approximate one-fold rate increase of nitrobenzene reduction by mixed culture with glucose as an electron donor. Selective elimination of oxygen moieties on the RGO surface, such as quinone groups, decreased the nitrobenzene transformation rate, whereas doping nitrogen into the RGO framework exhibited a positive effect. The study indicates that graphene-based carbon nanomaterials have the potential to accelerate the biological transformation of nitroaromatic compounds and that the functionalization of these carbon nanomaterials, especially through surface modification, would further enhance the conversion efficiency of contaminants.

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Role of the intrinsic properties of partially reduced graphene oxides on the chemical transformation of iopromide

Cited by 33 publications

References 83 publications

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations

Methane production enhanced by reduced graphene oxide in an anaerobic consortium supplied with particulate and soluble substrates

Facilitated biological reduction of nitroaromatic compounds by reduced graphene oxide and the role of its surface characteristics

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Role of the intrinsic properties of partially reduced graphene oxides on the chemical transformation of iopromide

Cited by 33 publications

References 83 publications

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N2O reduction in anaerobic sludge incubations

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N2O reduction in anaerobic sludge incubations

Methane production enhanced by reduced graphene oxide in an anaerobic consortium supplied with particulate and soluble substrates

Facilitated biological reduction of nitroaromatic compounds by reduced graphene oxide and the role of its surface characteristics

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Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations

Cold oxygen plasma induces changes on the surface of carbon materials enhancing methanogenesis and N₂O reduction in anaerobic sludge incubations