Identification of functional groups and determination of carboxyl formation temperature in graphene oxide using the XPS O 1s spectrum

Kwan, Yue Chau Garen; Ng, Ging Meng; Huan, C. H. A.

doi:10.1016/j.tsf.2015.07.051

Cited by 255 publications

(112 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1) associated with carbonyl (530.9 eV), carboxylic (532.2 eV) and hydroxyl (533.1 eV) functional groups, which were identified with higher intensity in the oxidized samples (PNS-O and PS-O) than those without oxidation. 19,20 Complementary to this result, the high-resolution C 1s spectra were obtained and Fig. 2 shows a relative decrease on the C-C peak (285 eV) in the oxidized samples, which agrees with the decrease in atomic percentage of carbon of the oxidized samples.…”

Section: Characterization Of Carbon-based Materialssupporting

confidence: 75%

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

View full text Add to dashboard Cite

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

show abstract

Section: Characterization Of Carbon-based Materialssupporting

confidence: 75%

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

View full text Add to dashboard Cite

show abstract

“…3(a) as-prepared ZnO hollow spheres. Moreover, the peak at 533 eV is usually attributed to the OH groups oxygen [29]. No hydroxyl groups oxygen peak is detected, indicating that there is no Zn(OH)2 phase in ZnO samples.…”

Section: Structure Morphology and Compositionmentioning

confidence: 99%

A high response butanol gas sensor based on ZnO hollow spheres

Han

Liu

Xing

et al. 2016

Sensors and Actuators B: Chemical

147

View full text Add to dashboard Cite

“…According to the curve fitting of C1s spectra (Figures 3(b) and 3(c)), compared with MC, MG-3 presents enhanced nonoxygenated carbon peaks (C = C/C − C) and weakened oxygenated carbon peaks (C − OH/C − O − C, C = O, and O -C = O), confirming such reduction process. More importantly, MG-3 exhibits broadened tail with an additional peak component at 291.4 eV on account of π − π * sp 2 transition, revealing the creation of more aromatic rings in the carbon basal plane [30,31]. In fact, MgO nanoparticles can increase the graphitic nature of the layered reduced graphene oxide microstructure [32].…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Huang

Geng

Kang

et al. 2018

Journal of Nanomaterials

View full text Add to dashboard Cite

Mesoporous graphene materials (MG-X) were prepared from potassium humate coupled with magnesium acetate. The freezedrying pretreatment and MgO particles not only prevent the agglomeration of graphene sheets and form mesopores but also help to reduce the oxygen content and enlarge the sp 2 carbon domain of MG-X. MG-X possess optimized characteristics including large specific surface area (>1100 m 2 ·g −1 ), high mesoporosity (~90%), and low oxygen content (~7%). When used as supercapacitor electrodes, MG-X demonstrate optimal electrochemical performances among all materials prepared here, such as high gravimetric capacitance (150 F·g −1 at high current density of 3.3 A·g −1) and enhanced rate capability with the capacitance retention of~80% from 0.041 to 3.3 A·g −1 . Moreover, MG-5 exhibits good cycling stability with a capacitance retention of 98.6% after 1000 cycles at 2.46 A·g −1 . This work provides a facile and efficient preparation method for mesoporous graphene materials used as supercapacitor electrodes.

show abstract

Identification of functional groups and determination of carboxyl formation temperature in graphene oxide using the XPS O 1s spectrum

Cited by 255 publications

References 49 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

A high response butanol gas sensor based on ZnO hollow spheres

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Contact Info

Product

Resources

About

Identification of functional groups and determination of carboxyl formation temperature in graphene oxide using the XPS O 1s spectrum

Cited by 255 publications

References 49 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

A high response butanol gas sensor based on ZnO hollow spheres

Facile Synthesis of Mesoporous Graphene Materials from Potassium Humate for Supercapacitor Electrodes

Contact Info

Product

Resources

About

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