Journal ArticleDOI
Influence of different heat treatments on the surface properties and catalytic performance of carbon nanotube in ozonation
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TLDR
In this paper, the influence of treatment conditions, gas atmosphere (N2 and H2) and temperature (450 and 950°C) on the surface properties and catalytic performance of carbon nanotube (CNT) were investigated for the degradation of oxalic acid in aqueous solution by the process of catalytic ozonation.Abstract:
The influences of treatment conditions, gas atmosphere (N2 and H2) and temperature (450 °C and 950 °C), on the surface properties and catalytic performance of carbon nanotube (CNT) were investigated for the degradation of oxalic acid in aqueous solution by the process of catalytic ozonation. No obvious change on the textural properties of CNT is found after heat treatment, while the results of Boehm titration clearly indicate the reduction of acidic groups and the increase of basic groups on CNT surface after heat treatment under different conditions, and then a significant improvement on oxalic acid removal by CNT catalytic ozonation is obtained. The heat treatment of CNT under H2 atmosphere is more effective in eliminating acidic groups and increasing basic groups than the case of N2 atmosphere at the same temperature, which results in higher catalytic activity and lower total organic carbon (TOC) release in ozonation correspondingly. A linear relationship is observed between the pH at the point of zero charge (pHPZC) of CNT and the rate constant for ozonation of oxalic acid in the presence of CNT with different treatments. It is suggested that heat treatment can increase the basic property of CNT, which can enhance the contribution of surface reactions to the whole reactions for ozonation of oxalic acid.read more
Citations
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Carbon nanotube catalysts: recent advances in synthesis, characterization and applications.
TL;DR: The characterization techniques detecting the bulk nature and surface properties as well as the effects of various functionalization approaches on modifying the surface properties for specific applications in catalysis including heterogeneous catalysis, photocatalysis, photoelectrocatalysis and electrocatalysis are highlighted.
Journal ArticleDOI
Catalytic ozonation for water and wastewater treatment: Recent advances and perspective.
Jianlong Wang,Hai Chen +1 more
TL;DR: Several key aspects of catalytic ozonation, such as pH effect, the catalyst performance, the catalytic mechanism were proposed, to which more attention should be paid in future study.
Journal ArticleDOI
Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification
TL;DR: The catalytic active sites and adsorption behaviors of O3 molecules on the catalyst surface are regarded as the key clues for further elucidating the O3 activation processes, evolution of reactive oxygen species (ROS), organic oxidation pathways.
Journal ArticleDOI
Electrochemical degradation of chloramphenicol with a novel Al doped PbO2 electrode: Performance, kinetics and degradation mechanism
TL;DR: In this paper, an electrochemical method for the degradation of chloramphenicol (CAP) in aqueous solution with a novel Al doped PbO2 electrode was presented.
Journal ArticleDOI
Selection of active phase of MnO2 for catalytic ozonation of 4-nitrophenol
TL;DR: All six phases of MnO2 (α-, β-, δ-, γ-, λ- and ε-) were synthesized by facile methods and showed stronger oxidation/reduction peaks in CV characterization, which benefited catalytic decomposition of ozone to generate active species.
References
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TL;DR: In this paper, a review of the surface chemistry of carbon blacks and other activated carbons is given, focusing on surface oxides with emphasis on the chemical methods used in the assessment and identification of surface functional groups.
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Photometric method for the determination of low concentrations of hydrogen peroxide by the peroxidase catalyzed oxidation of N,N-diethyl-p-phenylenediamine (DPD)
TL;DR: In this paper, the concentration of hydrogen peroxide (H2O2) in distilled water, drinking water and in different types of surface and rain waters can be easily determined by a photometric method in which N,N-diethyl-p-phenylenediamine (DPD) is oxidized by a peroxidase catalyzed reaction.
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The efficiency and mechanisms of catalytic ozonation
TL;DR: In this paper, the authors provide a short overview of catalytic processes, their recent advances and identify major directions taken to understand mechanisms governing catalytic process utilised in water and wastewater treatment.
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Infrared Spectral Evidence for the Etching of Carbon Nanotubes: Ozone Oxidation at 298 K
Douglas B. Mawhinney,Viktor Naumenko,and Anya Kuznetsova,John T. Yates,J. Liu† and,Richard E. Smalley +5 more
TL;DR: In this article, the authors used FTIR spectroscopic studies of the oxidation and etching of single-walled nanotubes (SWNTs) using ozone at 298 K and the subsequent thermal stability of the oxygenated groups.
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Catalytic ozonation: a promising advanced oxidation technology for water treatment
TL;DR: In this article, a short synthesis of the main results obtained, illustrated by three different experimental procedures which can be used to test catalytic ozonation, is presented, and some hypothesis on reaction mechanisms and prospects are examined.