Magnetic N-doped carbon nanotubes: A versatile and efficient material for the determination of polycyclic aromatic hydrocarbons in environmental water samples

Menezes, Helvécio Costa; Barcelos, Stella Maris Resende de; Macedo, Damiana Freire Dias; Purceno, Aluir D.; Machado, Bruno F.; Teixeira, Ana Paula C.; Lago, Rochel M.; Serp, Philippe; Cardeal, Zenilda de Lourdes

doi:10.1016/j.aca.2015.02.063

Cited by 44 publications

(12 citation statements)

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“…The N‐doped CNT structure is known to show several defects and the presence of nitrogen in the graphitic network induces a curvature of the tube graphitic layers . XRD, thermogravimetric, and Raman analysis performed previously support the well‐organized carbon structure of E30, as opposed to the more defective and reactive carbon present in A30, because a significant increase of defects occurs if increasing the N content. Briefly, Raman spectra showed the presence of one first‐order peak at approximately 1560 cm −1 (G‐band) and three second‐order features at approximately 1330 cm −1 (D‐band), 2700 cm −1 (G‐band), and 2940 cm −1 (combined D/G‐bands).…”

Section: Resultsmentioning

confidence: 86%

“…The transmission electron microscopy (TEM) results reported in previous studies, included in Table , reveal that the introduction of nitrogen in the carbon structure induces an increase of the tube diameter and a decrease in the interstitial space between individual CNTs. Undoped E30 consists of very regular multiwalled CNTs with an average external diameter of approximately 8 nm and Fe particles encapsulated in the structure (formed during the synthesis by catalytic chemical vapor deposition, CVD, through reduction of the iron oxide using H 2 produced during the decomposition of the carbon sources at high temperature, and that remained in the CNT structure after the purification step with H 2 SO 4 —see the Experimental Section).…”

Section: Resultsmentioning

confidence: 99%

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Role of Nitrogen Doping on the Performance of Carbon Nanotube Catalysts: A Catalytic Wet Peroxide Oxidation Application

et al. 2016

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Four magnetic carbon nanotube (CNT) samples (undoped, completely N‐doped, and two selectively N‐doped) were synthesized by chemical vapor deposition. The materials were tested in the catalytic wet peroxide oxidation (CWPO) of highly concentrated 4‐nitrophenol solutions (4‐NP, 5 g L−1). Relatively mild operating conditions were considered (atmospheric pressure, T=50 °C, pH 3), using a catalyst load of 2.5 g L−1 and the stoichiometric amount of H2O2 needed for the complete mineralization of 4‐NP. N‐doping was identified to influence considerably the CWPO performance of the materials. In particular, undoped CNTs, with a moderate hydrophobicity, favor the controllable and efficient decomposition of H2O2 into highly reactive hydroxyl radicals (HO.), thus showing high catalytic activity for 4‐NP degradation. On the other hand, the completely N‐doped catalyst, fully hydrophilic, favors a quick decomposition of H2O2 into nonreactive O2 and H2O species. The selectively N‐doped amphiphilic catalysts, that is, hybrid structures containing undoped sections followed by N‐doped ones, provided intermediate results, namely, a higher N content favored H2O2 decomposition towards nonreactive H2O and O2 species, whereas a lower N content resulted in the formation of HO., increasing 4‐NP mineralization. Catalyst stability and reusability were also investigated by consecutive CWPO runs.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Role of Nitrogen Doping on the Performance of Carbon Nanotube Catalysts: A Catalytic Wet Peroxide Oxidation Application

et al. 2016

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“…Also, MWCNTs have been combined with polyvinyl alcohol cryogel (MWCNTs/PVA) to form composites used for extraction and preconcentration of PAHs in water samples [109]. Despite the wide uses of MWCNTs composites in PAHs extraction, different limitations were reported, and these include technically complex and longtime of preparation with high costs, in addition to their agglomeration due to their high hydrophobic nature which hinders the PAHs adsorption processes [126,127]. Recently, the combination of MWCNTs composite and MNPs can be promising to overcome these limitations [128].…”

Section: Carbon Npsmentioning

confidence: 99%

Nanoparticles Used for Extraction of Polycyclic Aromatic Hydrocarbons

Mahgoub

2019

Journal of Chemistry

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This article offers a review on the application of nanoparticles (NPs) that have been used as sorbents in the analysis of polycyclic aromatic hydrocarbons (PAHs). The novel advances in the application of carbon NPs, mesoporous silica NPs, metal, metal oxides, and magnetic and magnetised NPs in the extraction of PAHs from matrix solutions were discussed. The extraction techniques used to isolate PAHs have been highlighted including their advantages and limitations. Methods for preparing NPs and optimized conditions of NPs extraction efficiency have been overviewed since proper extraction procedures were necessary to achieve optimum analytical results. The aim was to provide an overview of current knowledge and information in order to assess the need for further exploration that can lead to an efficient and optimum analysis of PAHs.

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“…Multi-walled carbon nanotubes (MWCNTs) have been used for the enrichment of phenolic compounds, phthalate esters, pesticides, drugs, and others (Cai et al 2003 ; Fang et al 2006 ; Niu et al 2007 ; Suárez et al 2007a , b ; Zhao et al 2007 ; El-Sheikh et al 2007 , 2008 ; Ravelo-Pérez et al 2008 ; Al-Degs et al 2009 ; Guan et al 2010 ; Gethard and Mitra 2011 ; Abdolmohammad-Zadeh and Sadeghi 2012 ; Bhadra et al 2012 ; Sun et al 2014 ; Hou et al 2014 ). As for the extraction of PAHs, CNTs have been used as sorbents only in several papers (Wang et al 2007 ; Ma et al 2010 ; Wu et al 2010 ; Menezes et al 2015 ). In all, the results have shown that the extraction efficiency was comparable or higher than with using conventional stationary phases.…”

Section: Introductionmentioning

confidence: 99%

“…The best results were obtained when methanol was used as the elution solvent and the carbon nanotubes had an outer diameter of 60–100 nm. Another method of sample preparation and the enrichment of PAHs from environmental matrices using hybrid magnetic carbon nanotubes (mCNTs) has been proposed by Menezes et al ( 2015 ). The hybrid mCNTs contain hydrophilic and hydrophobic parts which allow the maintenance of a stable dispersion of nanoparticles in water and the effective adsorption of PAHs.…”

Section: Introductionmentioning

confidence: 99%

Helical Multi-walled Carbon Nanotubes as an Efficient Material for the Dispersive Solid-Phase Extraction of Low and High Molecular Weight Polycyclic Aromatic Hydrocarbons from Water Samples: Theoretical Study

Paszkiewicz

Sikorska

Leszczyńska

et al. 2018

Water Air Soil Pollut

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The differences in effectiveness of multi-walled carbon nanotubes (MWCNTs) as the dispersive solid-phase extraction (dSPE) sorbent for the selective extraction of polycyclic aromatic hydrocarbons (PAHs) were explained on the basis of theoretical study. It was observed that for low molecular weight PAHs, the recoveries using non-helical and helical MWCNTs were similar. In contrary, for PAHs containing five or more aromatic rings, the extraction efficiency was higher using HMWCNTs than for non-helical ones. Principle component analysis (PCA) as well as providing structural parameters and interaction energies for adsorption processes (PAH + CNT → PAH-CNT) have been used for this purpose. All the PAH + CNT → PAH-CNT adsorption processes considered were found to be thermodynamically favorable. However, the adsorption energies (Eads) for PAHs and the helical carbon nanotube surface estimated for the B(a)P-HCNT and I(1,2,3-cd)P-HCNT are substantially less negative than those observed for PAH molecules interacting with the non-helical CNT. Namely, the Eads calculated in simulated aqueous environment for the B(a)P-MWCNT(6,2) and I(1,2,3-cd)P-MWCNT(6,2) were respectively − 43.32 and − 59.98 kcal/mol, while values of only − 7.75 kcal/mol (B(a)P-HCNT) and − 9.13 kcal/mol (I(1,2,3-cd)P-HCNT) were found for the corresponding PAH-HCNT systems. Therefore, we conclude that the replacement of MWCNTs with HCNTs leads to PAH-HCNT systems in which the interaction energies are much smaller than those estimated for the corresponding PAH-MWCNT systems. HMWCNTs are therefore recommended as the dSPE sorbent phase for the extraction of both low and high molecular weight PAHs from water samples.Electronic supplementary materialThe online version of this article (10.1007/s11270-018-3884-0) contains supplementary material, which is available to authorized users.

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Magnetic N-doped carbon nanotubes: A versatile and efficient material for the determination of polycyclic aromatic hydrocarbons in environmental water samples

Cited by 44 publications

References 30 publications

Role of Nitrogen Doping on the Performance of Carbon Nanotube Catalysts: A Catalytic Wet Peroxide Oxidation Application

Role of Nitrogen Doping on the Performance of Carbon Nanotube Catalysts: A Catalytic Wet Peroxide Oxidation Application

Nanoparticles Used for Extraction of Polycyclic Aromatic Hydrocarbons

Helical Multi-walled Carbon Nanotubes as an Efficient Material for the Dispersive Solid-Phase Extraction of Low and High Molecular Weight Polycyclic Aromatic Hydrocarbons from Water Samples: Theoretical Study

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