scholarly journals The Role of Carbon Nanotube Pretreatments in the Adsorption of Benzoic Acid

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2118
Author(s):  
Pierantonio De Luca ◽  
Carlo Siciliano ◽  
Anastasia Macario ◽  
Jànos B. Nagy
Keyword(s):  
Carbon Nanotubes ◽  
Benzoic Acid ◽  
Activated Carbons ◽  
Thermal Analyses ◽  
Contaminated Water ◽  
Different Types ◽  
Multi Walled Carbon Nanotubes ◽  
Uv Visible ◽  
Walled Carbon Nanotubes

Four different types of multi-walled carbon nanotubes (MWCNTs) were used and compared for the treatment of benzoic acid contaminated water. The types of nanotubes used were: (1) non-purified (CNTsUP), as made; (2) purified (CNTsP), not containing the catalyst; (3) oxidized (CNTsOX), characterized by the presence of groups such as, –COOH; (4) calcined (CNTs900), with elimination of interactions between nanotubes. In addition, activated carbon was also used to allow for later comparison. The adsorption tests were conducted on an aqueous solution of benzoic acid at concentration of 20 mg/L, as a model of carboxylated aromatic compounds. After the adsorption tests, the residual benzoic acid concentrations were measured by UV-visible spectrometry, while the carbon nanotubes were characterized by TG and DTA thermal analyses and electron microscopy (SEM). The results show that the type of nanotubes thermally treated at 900 °C has the best performances in terms of adsorption rate and amounts of collected acid, even if compared with the performance of activated carbons.

scholarly journals Rutin-Functionalized Multi-Walled Carbon Nanotubes: Molecular Docking, Physicochemistry and Cytotoxicity in Fibroblasts

Toxics ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 173
Author(s):  
Conrado M. S. Neto ◽  
Felipe C. Lima ◽  
Renata P. Morais ◽  
Lucas R. M. de Andrade ◽  
Renata de Lima ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Docking ◽  
Thermal Analyses ◽  
Three Dimensional ◽  
Morphological Structure ◽  
Dose Effect ◽  
Dimensional Structure ◽  
3T3 Fibroblasts ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-Walled Carbon Nanotubes (MWCNT) have been functionalized with rutin through three steps (i. reaction step; ii. purification step; iii. drying step) and their physicochemical properties investigated with respect to morphological structure, thermal analysis, Fourier Transform Infrared Spectroscopy (FTIR), and cytotoxicity. The molecular docking suggested the rutin-functionalized MWCNT occurred by hydrogen bonds, which was confirmed by FTIR assays, corroborating the results obtained by thermal analyses. A tubular shape, arranged in a three-dimensional structure, could be observed. Mild cytotoxicity observed in 3T3 fibroblasts suggested a dose–effect relationship after exposure. These findings suggest the formation of aggregates of filamentous structures on the cells favoring the cell penetration.

scholarly journals Translocation of Functionalized Multi-Walled Carbon Nanotubes across Human Pulmonary Alveolar Epithelium: Dominant Role of Epithelial Type 1 Cells

ACS Nano ◽  
2016 ◽  
Vol 10 (5) ◽  
pp. 5070-5085 ◽  
Author(s):  
Pakatip Ruenraroengsak ◽  
Shu Chen ◽  
Sheng Hu ◽  
Jodie Melbourne ◽  
Sinbad Sweeney ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Dominant Role ◽  
Alveolar Epithelium ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Evidence of Conjugation Enhancement in P3HT/SWNT Mixtures for Organic Photovoltaics

2011 ◽  
Vol 1286 ◽  
Author(s):  
Marco Bernardi ◽  
Michele Giulianini ◽  
Nunzio Motta ◽  
Jeffrey C. Grossman
Keyword(s):  
Carbon Nanotubes ◽  
Optical Absorption ◽  
Bulk Heterojunction ◽  
Md Simulations ◽  
Cylindrical Shape ◽  
Heterojunction Solar Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Nanotube Chirality

ABSTRACTClassical molecular dynamics (MD) simulations in conjunction with optical absorption and AFM/nano-Raman experiments are employed to relate the molecular-scale arrangement and conjugation of poly-3-hexylthiophene (P3HT) adsorbed onto single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). Taken together our results demonstrate the templating role of carbon nanotubes in increasing the π-conjugation length of the P3HT at the P3HT/carbon nanotube interface. The MD simulations show that SWNTs and MWNTs, due to their inherent 1-dimensional (1D) cylindrical shape and π-conjugation, planarize the P3HT molecules adsorbed at their surface and thus quench their torsional disorder, regardless of the P3HT conformation and nanotube chirality. This effect is more significant for higher SWNT weight fractions in the sample (since it is an interface effect). We investigated this effect experimentally by acquiring nano-Raman spectra in regions of high-MWNT/low-P3HT content in addition to optical absorption spectra of P3HT-SWNT composites with different SWNT concentrations . The increase in the P3HT conjugation is confirmed by a shift of a P3HT feature in the Raman spectrum when going from P3HT-rich to SWNT-rich areas in the mixture. The significance of this work for charge transfer at the P3HT-SWNT interface in bulk-heterojunction solar cells is discussed.

4-Substituted Benzoic Acids Functionalized Multi-Walled Carbon Nanotubes in Mild Polyphosphoric Acid/Phosphorous Pentoxide

2011 ◽  
Vol 217-218 ◽  
pp. 768-773 ◽  
Author(s):  
Hai Hui Liu ◽  
Ning Wang ◽  
Li Chen Hou ◽  
Wei Wei Peng ◽  
Yan Mei Jin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Benzoic Acid ◽  
Polyphosphoric Acid ◽  
Reaction Medium ◽  
Phosphorous Pentoxide ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Pre Treatment ◽  
Substituted Benzoic Acids ◽  
Walled Carbon Nanotubes

Pristine multi-walled carbon nanotubes (P-MWNTs) were functionalized with 4-substituted benzoic acid via ‘‘direct’’ Friedel-Crafts acylation in mild reaction medium of polyphosphoric acid (PPA)/phosphorous pentoxide (P2O5). Raman spectroscopy, thermogravimetric analysis, transmission electron microscopy were applied in this paper to demonstrate that multi-walled carbon nanotubes inherently have functional groups on their surfaces as a result of the reaction. The overall evidence indicates that the 4-substituted benzoic acid functionalization of carbon nanotube can be achieved without oxidation as pre-treatment. Thus, aryl carbonyl moieties with different length of 4-substituted alkyl acyl amine functionalized MWNTs（F-MWNTs） can be synthesized simply, without disrupting the primary structures of the nanotubes.

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