Catalytic wet oxidation of organic compounds over N-doped carbon nanotubes in batch and continuous operation

Santos, Diogo F.M.; Soares, O.S.G.P.; Silva, Adrián M.T.; Figueiredo, José L.; Pereira, M.F.R.

doi:10.1016/j.apcatb.2016.06.041

Cited by 29 publications

(8 citation statements)

References 49 publications

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“…TiO2 combinations with noble metals (e.g., silver, gold and platinum) [63] or with carbon-based materials such as graphene-based materials [132,133], have also been examined. Other carbon materials have been widely studied, including activated carbons [134,135], carbon xerogels [136], carbon nanotubes [137,138], graphite [139], and more recently graphitic carbon nitride [140]. The suppression of the recombination of photo-generated charge carriers has been attempted, by adding oxidizing agents/electron acceptors (e.g., inorganic peroxides (S2O8 2− ), Fe 3+ , H2O2), doping the material with metal ions or anions, by noble metal loading, dye sensitization or using composite semiconductors [126,141,142].…”

Section: Photocatalysismentioning

confidence: 99%

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ribeiro

Moreira

Puma

et al. 2019

Chemical Engineering Journal

Self Cite

430

110

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Micropollutants (MPs) in the aquatic compartments originate from many sources and particularly from the effluents of urban wastewater treatment plants (UWWTPs). Advanced oxidation technologies (AOTs) usually applied after biological processes, have recently emerged as effective tertiary treatments for the removal of MPs, but the oxidation rates of the single compounds may be largely affected by the constituent species of the water matrix. These species include dissolved organic matter and inorganic species (e.g., carbonate, bicarbonate, nitrite, sulphate, chloride). This review analyses the impact of such substances on common AOTs including photolysis, UV/H2O2, Fenton, photocatalysis, and ozone-based processes. The degradation efficiency of single MPs by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting effect, depending on the process and the mechanism by which these water components react. Organic species can be either inhibitors (by light attenuation; scavenging effects; or adsorption to catalyst) or promoters (by originating reactive oxygen species (ROS) which enhance indirect photolysis; or by regenerating the catalyst). Inorganic species can also be either inhibitors (by scavenging effects; formation of radicals less active than hydroxyl radicals; iron complexation; adsorption to catalyst or decrease 2 of its effective surface area) or promoters (e.g., nitrate ions by formation of ROS; iron ions as additional source of catalyst). The available data reviewed here is limited and the role and mechanisms of individual water components are still not completely understood. Further studies are needed to elucidate the wide spectrum of reactions occurring in complex wastewaters and to increase the adoption of AOTs in UWWTPs.

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Section: Photocatalysismentioning

confidence: 99%

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ribeiro

Moreira

Puma

et al. 2019

Chemical Engineering Journal

Self Cite

430

110

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“…Because of their large specific surface area and unique surface properties (i.e., more functional groups), ,, BM-CNMs have been evaluated in several previous studies as a sorbent for the removal/immobilization of various contaminants including metals, radionuclides, oxyanions, and organic compounds in aqueous and soil systems (Table ). The effect of ball-milling conditions on the sorptive properties of BM-CNMs and the sorption mechanisms of various contaminates on BM-CNMs have also been investigated. ,,,− Soares et al compared the performance of novel N-doped CNTs prepared by different ball-milling methods and found that CNT-BM-M-DT (ball milling with melamine without solvent) displayed the highest amount of N functionalities and catalytic capacity for the oxidation of oxalic acid by both catalytic wet air oxidation (CWAO) and catalytic ozonation (COZ). Under the operation conditions used, oxalic acid was completely mineralized in 5 min by CWAO and in 4 h by COZ (Figure ).…”

Section: Energy and Environmental Applications Of Bm-cnmsmentioning

confidence: 99%

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Lyu

Gao

et al. 2017

ACS Sustainable Chem. Eng.

230

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With exceptional physicochemical properties, carbon nanomaterials (CNMs) have been widely applied in various energy and environmental applications including energy conversion, energy storage, and environmental remediation. Recent efforts have been made to prepare modified CNMs with improved electrical and chemical properties, hence broadening their potential applications. It is highly desirable to produce high-quality CNMs at a low cost and large scale, which remains a challenging task. Ball-milled CNMs (BM-CNMs) are a novel class of engineered materials that may provide new opportunities to satisfy the need. To promote the research on BM-CNMs, this work provides a comprehensive review on recent research development in (1) synthesis of various types of BM-CNMs, (2) effects of ball milling on physicochemical properties of BM-CNMs, and (3) energy and environmental applications of BM-CNMs. Different ball-milling processes for preparing BM-CNMs and modified BM-CNMs with desired particle size, structure, and surface properties are summarized and discussed. The physicochemical properties of pristine CNMs and BM-CNMs are compared. Because of BM-CNM’s unique properties, such as excellent catalytic, electrochemical, and sorptive properties, their potential applications in energy conversion, energy storage, and environmental remediation are also discussed. Key challenges and further research needs are proposed at the end.

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“…Advanced oxidation processes based on Å OH or Å O 2 À have been commonly used in the degradation of persistent organic pollutants in water. For example, lots of technologies have been applied to generate Å OH or Å O 2 À radicals for aniline degradation including Fenton process [6,7], photocatalysis [8][9][10], catalytic wet oxidation [11][12][13], ozonation [14][15][16] and electrochemical oxidation [17][18][19][20]. However, these technologies have several limitations such as metal leaching, low pH rang (3)(4), excessive sludge production, and the high hydrogen peroxide transportation cost [1,4].…”

Section: Introductionmentioning

confidence: 99%

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

Huang

Zhang

et al. 2017

Chemical Engineering Journal

109

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Catalytic wet oxidation of organic compounds over N-doped carbon nanotubes in batch and continuous operation

Cited by 29 publications

References 49 publications

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

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