Evaluation of multi-walled carbon nanotubes as gas chromatographic column packing

Li, Quanlong; Yuan, Dongxing

doi:10.1016/s0021-9673(03)00848-3

Cited by 93 publications

(49 citation statements)

References 18 publications

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“…They also showed satisfactory analytical potential as effective solid-phase extraction adsorbents for cyanazine [17], chlorotoluron [18], bisphenol A, 4-n-nonylphenol, 4-tert-octylphenol [19], chlorophenols [20], and several phthalate esters [21], non-steroidal anti-inflammatory drugs [22], and polybrominated diphenyl ethers [23]. And CNTs have been used as adsorbents for trapping or separation of volatile organic compounds, indicating the potential in chromatographic applications [11,[24][25][26]. All these studies mentioned above reveal that CNTs are the promising materials in SPE fields.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of carbon nanotubes as a solid-phase extraction adsorbent for the extraction of cephalosporins antibiotics, sulfonamides and phenolic compounds from aqueous solution

Niu

Cai

Shi

et al. 2007

Analytica Chimica Acta

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The adsorptive potential of carbon nanotubes (single-walled carbon nanotubes and multi-walled carbon nanotubes) for solid-phase extraction of three groups of highly polar compounds (namely cephalosporins antibiotics, sulfonamides and phenolic compounds) was tested in this article. The analytes were strongly retained by the carbon nanotubes. And acceptable recoveries were obtained with the addition of ammonium acetate into eluents. The effects of solution pH on the recoveries of the antibiotics and phenolic compounds were examined. To check the retention abilities of three groups of compounds on carbon nanotubes, fixed amount of each analyte was added to different volumes (up to 500 mL) of aqueous solution, and then extracted by the sorbents. Comparative studies showed that the carbon nanotubes were much superior to C 18 for the extraction of the highly polar analytes. For the cephalosporins antibiotics and sulfonamides, the carbon nanotubes showed stronger retention capability than graphitized carbon blacks, but for some of the phenolic compounds graphitized carbon blacks seemed to be more suitable, indicating different retention mechanisms of these analytes. To further assess the enrichment ability of carbon nanotubes for highly polar compounds, the solid-phase extraction method of multi-walled carbon nanotubes packed cartridge was well developed, and the sulfonamides were used as model compounds. Under the optimal procedures, the detection limits of sulfonamides were in the range of 27-38 ng L −1 . The spiked recoveries from several real water samples obtained for sulfathiazole and sulfadiazine ranged from 55% to 79% and 72% to 92%, respectively, while the recoveries of sulfapyridine and sulfamethazine were in the range of 85-102%.

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Section: Introductionmentioning

confidence: 99%

Evaluation of carbon nanotubes as a solid-phase extraction adsorbent for the extraction of cephalosporins antibiotics, sulfonamides and phenolic compounds from aqueous solution

Niu

Cai

Shi

et al. 2007

Analytica Chimica Acta

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“…According to our literature survey, MWCNT has been used as an extraction sorbent for determination of trace copper in water samples 7) , or as an absorbent for trapping volatile organic compounds from environmental samples 8,9) . To the best of our knowledge, Du et al 10) were the first to demonstrate the separation of hemoglobin and cytochrome C by means of a tiny column (2.3×5 mm) packed with modified MWCNT.…”

Section: Discussionmentioning

confidence: 99%

Chromatography of carbon nanotubes separated albumin from other serum proteins: a method for direct analysis of their interactions

et al. 2010

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Chromatography technology was employed to clarify the mechanism of interaction between multi-wall carbon nanotubes (MWCNT) and proteins. A column (16×100 mm) was packed with purified MWCNT, and various proteins were eluted with phosphate buffered saline (PBS) with and without gradient systems. It was found that albumin in bovine serum was eluted immediately from the column without any adsorption to MWCNT. Conversely, the non-albumin proteins, including a protein of 85 kDa molecular mass and a group of proteins with molecular masses higher than 115 kDa, exhibited considerably high affinity towards MWCNT. A sample of pure bovine serum albumin was also eluted immediately from the column, while lysozyme did not elute as a peak with PBS, but eluted with 0.6 M NaCl. Fundamentally, carbon nanotubes are devoid of any electrical charge. Therefore, other forces including the hydrogen bonds, hydrophilic interactions, and van der Waals forces were most probably responsible for the differential elution behaviors. In conclusion, this chromatographic method provided a simple and direct analysis of the interactions between carbon nanotubes and the various proteins.

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“…All chromatograms were recorded using a data logger with a sampling frequency of 50 Hz and an A/D resolution of 16 bits. The fabricated column was tested by separating nalkane mixtures because CNTs are nonpolar phases [9,11]. For temperature-programmed separation, the injection volume was 0.1 μL for a mixture of n-alkanes with a split ratio of 140:1.…”

Section: Methodsmentioning

confidence: 99%

“…Carbon nanotubes (CNTs) are attractive materials for the chromatographic stationary phase, and previous studies have demonstrated that CNTs have good separation ability due to chemical and thermal stability and a high surface-to-volume ratio [9][10][11][12]. These studies used a conventional steel, glass, or fused-silica column.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nanotube Stationary Phase in a Microfabricated Column for High-Performance Gas Chromatography

Nakai¹,

Okawa²,

Takada³

et al. 2009

AIP Conference Proceedings

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Abstract. We report a microfabricated gas chromatography (GC) column that uses a thin layer of high-quality singlewalled carbon nanotubes (SWNTs) as a stationary phase. This 1.0-m-long, 160-μm-wide, 250-μm-deep column has the highest separation efficiency reported to date for microfabricated columns having an SWNT stationary phase. Separation efficiency was evaluated with a Golay plot, in which the minimum of the height equivalent to a theoretical plate was 0.062 cm. The microfabricated column was able to separate n-alkanes having high boiling points under temperatureprogrammed conditions. Use of SWNTs as a stationary phase will be potentially useful for high-performance micro-GC.

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Evaluation of multi-walled carbon nanotubes as gas chromatographic column packing

Cited by 93 publications

References 18 publications

Evaluation of carbon nanotubes as a solid-phase extraction adsorbent for the extraction of cephalosporins antibiotics, sulfonamides and phenolic compounds from aqueous solution

Evaluation of carbon nanotubes as a solid-phase extraction adsorbent for the extraction of cephalosporins antibiotics, sulfonamides and phenolic compounds from aqueous solution

Chromatography of carbon nanotubes separated albumin from other serum proteins: a method for direct analysis of their interactions

Carbon Nanotube Stationary Phase in a Microfabricated Column for High-Performance Gas Chromatography

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