scholarly journals Non-purified commercial multiwalled carbon nanotubes supported on electrospun polyacrylonitrile@polypyrrole nanofibers as photocatalysts for water decontamination

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 9911-9920
Author(s):  
Gabriele Capilli ◽  
Damian Rodríguez Sartori ◽  
Monica C. Gonzalez ◽  
Enzo Laurenti ◽  
Claudio Minero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Advanced Oxidation Processes ◽  
Supported Catalyst ◽  
Advanced Oxidation ◽  
Multiwalled Carbon ◽  
Water Decontamination ◽  
Oxidation Processes ◽  
Commercial Carbon ◽  
Metallic Impurities

Under UV-Vis irradiation, the metallic impurities embedded in non-purified commercial carbon nanotubes generate radicals suitable for advanced oxidation processes. Semiconducting PPY membranes enhance the photo activity of a supported catalyst.

scholarly journals Catalytic Advanced Oxidation Processes for Sulfamethoxazole Degradation

2019 ◽  
Vol 9 (13) ◽  
pp. 2652 ◽  
Author(s):  
Jéssica Martini ◽  
Carla A. Orge ◽  
Joaquim L. Faria ◽  
M. Fernando R. Pereira ◽  
O. Salomé G. P. Soares
Keyword(s):  
Carbon Nanotubes ◽  
Titanium Dioxide ◽  
Reaction Time ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Catalytic Ozonation ◽  
Ion Concentrations ◽  
Oxidation Processes ◽  
Photocatalytic Ozonation ◽  
Mineralization Degree

The degradation of sulfamethoxazole (SMX) by several advanced oxidation processes (AOPs) is carried out in the presence of different catalysts. The catalysts used consisted of carbon nanotubes (CNT), titanium dioxide (TiO2), a composite of carbon nanotubes and titanium dioxide (TiO2/CNT), and iron supported on carbon nanotubes (Fe/CNT). SMX removal was evaluated by catalytic ozonation, photocatalysis, catalytic oxidation with hydrogen peroxide, and combinations of these processes. The evolution of the SMX concentration during reaction time, the mineralization degree, the toxicity of the treated solution, and the formation of organic intermediates and ions were monitored. Ozonation catalyzed by Fe/CNT and CNT and photocatalytic ozonation in the presence of CNT presented the fastest degradation of SMX, whereas photocatalytic ozonation with CNT showed the best results in terms of organic matter removal (92% of total organic carbon (TOC) depletion). Total mineralization of the solution and almost complete reduction of toxicity was only achieved in the photocatalytic ozonation with H2O2 and Fe/CNT catalysts. The compound 3-amino-5-methylisoxazole was one of the first intermediates formed during SMX degradation. p-Benzoquinone was only formed in photocatalysis. Oxalic and oxamic acids were also detected and in most of the catalytic processes they appeared in small amounts. Ion concentrations increased with the reaction time.

scholarly journals Catalytic performance of heteroatom-modified carbon nanotubes in advanced oxidation processes

2014 ◽  
Vol 35 (6) ◽  
pp. 896-905 ◽  
Author(s):  
João Restivo ◽  
Raquel P. Rocha ◽  
Adrián M.T. Silva ◽  
José J.M. Órfão ◽  
Manuel F.R. Pereira ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Catalytic Performance ◽  
Oxidation Processes ◽  
Modified Carbon Nanotubes

scholarly journals The MWCNTs-Rh Nanocomposite Obtained By The New High-Temperature Method

2015 ◽  
Vol 60 (2) ◽  
pp. 1057-1063 ◽  
Author(s):  
A.D. Dobrzańska-Danikiewicz ◽  
D. Cichocki ◽  
D. Łukowiec
Keyword(s):  
Carbon Nanotubes ◽  
High Temperature ◽  
Multiwalled Carbon Nanotubes ◽  
Chemical Vapour ◽  
Multiwalled Carbon ◽  
Rhodium Nanoparticles ◽  
Temperature Method ◽  
The Subject ◽  
20 Nm ◽  
Metallic Impurities

AbstractA nanocomposite was fabricated during the research undertaken, consisting of multiwalled carbon nanotubes coated with rhodium nanoparticles by the new high-temperature method being the subject of the patent claim. High quality multiwalled carbon nanotubes (MWCNTs) with the length of 100÷500 nm and the diameter of 8÷20 nm obtained in advance with Catalytic Chemical Vapour Deposition (CVD) were employed in the investigations. The nanotubes manufactured under the own research contain small amounts of metallic impurities and amorphous carbon deposits. Multiwalled carbon nanotubes functionalisation in acids was applied to deposit rhodium nanoparticles onto the surface of carbon nanotubes, and then the material was placed in a solution being a precursor of rhodium nanoparticles. The material prepared was next placed in a quartz vessel and subjected to high-temperature reduction in the atmosphere of argon to deposit rhodium nanoparticles onto the surface of multiwalled carbon nanotubes. The following examinations were performed, respectively: MWCNTs fabrication, fabrication of a CNT-NPs (Carbon NanoTube-NanoParticles) nanocomposite material; the characterisation of the materials produced including examination of the structure and morphology, and the assessment of rhodium nanoparticles distribution on the surface of carbon nanotubes. Micro- and spectroscopy techniques were employed to characterise the structure of the nanocomposites obtained.

Purification and Functionalization of Carbon Nanotubes by Classical and Advanced Oxidation Processes

2009 ◽  
Vol 9 (10) ◽  
pp. 6228-6233 ◽  
Author(s):  
M. Escobar ◽  
S. Goyanes ◽  
M. A. Corcuera ◽  
A. Eceiza ◽  
I. Mondragon ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
Functionalization Of Carbon Nanotubes

Carbon nanotubes-ferrite-manganese dioxide micromotors for advanced oxidation processes in water treatment

2018 ◽  
Vol 5 (12) ◽  
pp. 2993-3003 ◽  
Author(s):  
Roberto Maria-Hormigos ◽  
Marta Pacheco ◽  
Beatriz Jurado-Sánchez ◽  
Alberto Escarpa
Keyword(s):  
Carbon Nanotubes ◽  
Water Treatment ◽  
Manganese Dioxide ◽  
Organic Pollutants ◽  
Water Oxidation ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes

Multifunctional SW-Fe2O3/MnO2 tubular micromotors are used for ‘on-the-fly’ advanced water oxidation of industrial organic pollutants.

Fabrication and Characterization of Multiwalled Carbon Nanotubes-Alumina Hybrid Compound: Comparison of Various Supported Catalyst

2013 ◽  
Vol 594-595 ◽  
pp. 378-381
Author(s):  
Nosbi Norlin ◽  
Hazizan Md Akil
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Supported Catalysts ◽  
Chemical Vapour ◽  
Supported Catalyst ◽  
Multiwalled Carbon ◽  
Hybrid Compound ◽  
Carbon Structures ◽  
Catalyst Effect

Hybrid compounds of multiwalled carbon nanotubes-alumina (MWCNT-Al2O3) were grown by chemical vapour deposition (CVD) method of methane. The catalyst effect and growth of the synthesis of the multiwalled carbon nanotubes-alumina (MWCNT-Al2O3) hybrid compound in three different supported catalysts (Ni, Co and Fe nitrates) were being compared. X-Ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) were employed for the characterization of the hybrid compound. The results revealed that the Ni nitrates catalysts showed a better growth rate performance than Co Nitrates and Fe Nitrates. With respect to the diameter of the MWCNT-Al2O3,the Fe nitrate showed lengthens in diameter compared to Co Nitrates and Ni Nitrates catalyst. This indicated that the growths of these carbon structures can be controlled and manipulated by the supported catalyst.

Highly active N-doped carbon nanotubes prepared by an easy ball milling method for advanced oxidation processes

2016 ◽  
Vol 192 ◽  
pp. 296-303 ◽  
Author(s):  
O.S.G.P. Soares ◽  
R.P. Rocha ◽  
A.G. Gonçalves ◽  
J.L. Figueiredo ◽  
J.J.M. Órfão ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Ball Milling ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
Highly Active ◽  
Milling Method
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