Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Saridara, Chutarat; Ragunath, S.; Pu, Yong; Mitra, Somenath

doi:10.1016/j.aca.2010.01.037

Cited by 18 publications

(11 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The precision in desorption from f‐MWNT was also excellent. This was consistent with previous publications where the desorption bandwidths from single and multiwalled tubes had been found to be narrower than to conventional carbon‐based sorbents for both volatile as well as semivolatile organics , and the desorption profiles from f‐MWNTs were found to be more favorable for polar analytes .…”

Section: Resultssupporting

confidence: 92%

“…Since the carbon in the CFCs is tetrahedral and is bonded to atoms of different electronegativities, it has a strong dipole moment, which creates an electrophilic carbon atom that is attracted to nucleophilic sites in COOH and PA. As a result, both PA and carboxylic functionalities showed strong interactions with the CFCs leading to relatively longer breakthrough times. This was consistent with previous publications . On the other hand, the functional groups of ODA did not provide significant interactions with CFCs, consequently a very short breakthrough times was observed.…”

Section: Resultssupporting

confidence: 92%

“…The retention has both enthalpy and specific components. The maximum Δ H s was for MWNTs, which suggested that energetically it had the strongest interaction with the analyte and this was in conformity with what has been previously reported . However, specific interactions were predominant for COOH and PA functionalities where polarity played an important role.…”

Section: Resultssupporting

confidence: 89%

“…GC analysis provides some inherent advantages because it is a high‐resolution separation technique, and cost‐effective analytical platforms can be developed that can serve as field instruments. However, this is a challenging task because the concentration of CO 2 and other background gases is high, and the concentration of CFCs is relatively low (sub‐ppm to ppb) .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced preconcentration of selected chlorofluorocarbons on multiwalled carbon nanotubes with polar functionalities

et al. 2015

Self Cite

View full text Add to dashboard Cite

Chromatographic monitoring of chlorofluorocarbons in air requires the preconcentration of these highly volatile species. In this paper, we present functionalized multiwalled carbon nanotubes as effective sorbents for a microtrap designed for chlorofluorocarbons preconcentration. Among the commercial carbons and carbon nanotubes studied, functionalization via carboxylation and propyl amine was most effective for dichlorofluoromethane and trichlorofluoromethane (Freon 11), which were selected as representative chlorofluorocarbons. The results show that carbon nanotubes functionalized with a polar groups led to as much as a 300% increase in breakthrough volume and the desorption bandwidth was reduced by 2.5 times.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced preconcentration of selected chlorofluorocarbons on multiwalled carbon nanotubes with polar functionalities

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…18,19 Pervaporation is an effective separation method utilising membrane permeation and evaporation. 20 The hollow-fibre membrane pervaporation technique shows a low efficiency for semivolatile compounds and could be "environmentally unfriendly" because the volatilised solvent escapes to the atmosphere.…”

Section: -6mentioning

confidence: 99%

A Rapid Preconcentration Method Using Modified GP-MSE for Sensitive Determination of Trace Semivolatile Organic Pollutants in the Gas Phase of Ambient Air

He¹,

Qing-juan²,

Yang³

et al. 2014

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

A sensitive concentration method utilising modified gas-purge microsyringe extraction (GP-MSE) was developed. Concentration (reduction in volume) to a microlitre volume was achieved. PAHs were utilised as semivolatile analytes to optimise the various parameters that affect the concentration efficiency. The injection rate and temperature were the key factors that affected the concentration efficiency. An efficient concentration (75.0−96.1%) of PAHs was obtained under the optimised conditions. The method exhibited good reproducibility (RSD values that ranged from 1.5 to 9.0%). The GP-MSE concentration method enhances the volume reduction (concentration factor), leading to a low method detection limit (0.5−15 ng L -1). Furthermore, this method offers the advantage of small-volume sampling, enabling even the detection of diurnal hourly changes in the concentration of PAHs in ambient air. Utilising this method in combination with GC−MS, the diurnal hourly flux of PAHs from the gas phase of ambient air was measured. Indeed, the proposed technique is a simple, fast, low-cost and environmentally friendly.

show abstract

Micropreconcentration units based on carbon nanotubes (CNT)

Hussain

Mitra

2010

Anal Bioanal Chem

View full text Add to dashboard Cite

Carbon nanotubes (CNT) have some highly desirable sorbent characteristics which make them attractive for a variety of analytical applications. High adsorption capacity and rapid desorbability make CNT excellent candidates for micro-scale devices for gas and liquid-phase analysis. In gas-phase analysis one can implement a micro-concentrator or a micro-sorbent trap, which have been used in a variety of on-line chromatography and sensing applications. Interesting liquid-phase microtrapping applications include micro-scale solid-phase extraction (μ-SPE) and solid-phase micro extraction (SPME). In addition, the ease of surface functionalization, self assembly by chemical vapor deposition, and the formation of diverse polymer composites may well make CNT the high-performance sorbent of the future.

show abstract

Methane preconcentration in a microtrap using multiwalled carbon nanotubes as sorbents

Cited by 18 publications

References 52 publications

Enhanced preconcentration of selected chlorofluorocarbons on multiwalled carbon nanotubes with polar functionalities

Enhanced preconcentration of selected chlorofluorocarbons on multiwalled carbon nanotubes with polar functionalities

A Rapid Preconcentration Method Using Modified GP-MSE for Sensitive Determination of Trace Semivolatile Organic Pollutants in the Gas Phase of Ambient Air

Micropreconcentration units based on carbon nanotubes (CNT)

Contact Info

Product

Resources

About