Adsorption Measurement of Water/Ethanol Mixtures on Activated Carbon Fiber

Dreisbach, F.; Lösch, H. W.; Nakai, Kenta

doi:10.1002/1521-4125(200110)24:10<1001::aid-ceat1001>3.0.co;2-o

Cited by 14 publications

(4 citation statements)

References 5 publications

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“…Subtracting out the gas-phase contribution from the total hydrogen loading data in Figure enables one to establish a hydrogen isotherm. In Figure , isotherm data from the capsule unit based on the experimental data shown in Figure are compared to literature data for the H 2 −GX31 system measured by a traditional gravimetric sorption technique , and a differential pressure adsorption unit (DPAU) . In addition, data are included for a second, completely independent, capsule investigation using a 1.6787 g sample.…”

Section: Resultsmentioning

confidence: 99%

A Simple Technique for the Measurement of H₂ Sorption Capacities

Zielinski

McKeon

Kimak

2006

Ind. Eng. Chem. Res.

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An accurate (and low-cost) experimental technique has been developed to screen the effectiveness of an adsorbent in improving gas storage capacity within a pressurized vessel. Specifically, the capsule technique is shown to be effective in directly measuring the total H 2 contained within a pressurized vessel and can be used to evaluate the amount of gas in the free space and adsorbed on the solid, that is, a sorption isotherm. The capsule technique was benchmarked by measuring isotherm data for CH 4 on an activated carbon sample and was then subsequently evaluated for use with H 2 . The capsule data are in excellent agreement with the total storage capacities expected from calculations using equation of state information. In addition, H 2 isotherm data from the sorption capsule are found to be within 1% of values obtained from a more sophisticated differential pressure adsorption unit (DPAU). Conditions for when the adsorbent aids or hinders storage are also discussed in terms of the 2010 DOE H 2 storage targets.

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Section: Resultsmentioning

confidence: 99%

A Simple Technique for the Measurement of H₂ Sorption Capacities

Zielinski

McKeon

Kimak

2006

Ind. Eng. Chem. Res.

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“…The CO 2 adsorption isotherms in the absence of water vapor were measured at 313 K on a ChemiSorb HTP chemical adsorption analyzer (Micromeritics, Japan) after pretreatment of the adsorbent material under a He flow at 343 K for 6 h. In contrast, the CO 2 adsorption isotherms in the presence of water vapor (moisture pre-adsorption) at 313 K were obtained on BELSORP-BG (BEL Japan, Inc.) after pretreatment of the adsorbent material at 343 K for 6 h under vacuum. Measurements obtained on BELSORP-BG are based on a gravimetric–volumetric method for determination of the binary component gaseous adsorption isotherms. − …”

Section: Methodsmentioning

confidence: 99%

Carbon Dioxide Adsorption onto Polyethylenimine-Functionalized Porous Chitosan Beads

Fujiki

Yogo

2014

Energy Fuels

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Polyethylenimine-functionalized porous chitosan (PEI−CS) beads were prepared and their CO 2 adsorption performance was evaluated. The CO 2 adsorption capacity of PEI−CS was dependent upon both the amine content and surface area of the functionalized beads. PEI−CS showed a CO 2 adsorption capacity of 2.3 mmol/g at 313 K and 15 kPa of CO 2 in the absence of water vapor that considerably increased to 3.6 mmol/g in the presence of water vapor. To rationalize this phenomenon, the CO 2 adsorption mechanisms in the absence and presence of water vapor were investigated by diffuse reflectance infrared Fourier transform spectroscopy. The results indicated that the mechanism of CO 2 adsorption onto PEI−CS, in both the absence and presence of water vapor, involved the formation of carbamate. Therefore, the higher CO 2 adsorption capacity in the presence of water vapor was attributed to the increased accessibility to amino groups of PEI−CS, owing to swelling of the polyethylenimine chain and/or chitosan framework upon adsorption of water. The herein reported chitosan-based material displays high CO 2 adsorption capacity as well as excellent regenerability and, thereby, shows potential as an adsorbent for CO 2 capture.

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“…In the present study, we have explored some effects of water vapor on the chemo-resistive behavior of a set of different vQRS, exposed to different types of VOC having different polarities and present in exhaled breath. Water molecules can interact with analytes before impacting the transducer but also compete with them upon adsorption in the conductive polymer nanocomposite (CPC) layer and during their diffusion to the nano-junctions of the conducting architecture [48][49][50][51][52]. Polar VOC can be soluble in water at different degrees and sometimes can create hydrogen bondings [53][54][55].…”

Section: Name Pvp Aps Appmentioning

confidence: 99%

Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

et al. 2018

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The anticipated diagnosis of various fatal diseases from the analysis of volatile organic compounds (VOC) biomarkers of the volatolome is the object of very dynamic research. Nanocomposite-based quantum resistive vapor sensors (vQRS) exhibit strong advantages in the detection of biomarkers, as they can operate at room temperature with low consumption and sub ppm (part per million) sensitivity. However, to meet this application they need to detect some ppm or less amounts of biomarkers in patients' breath, skin, or urine in complex blends of numerous VOC, most of the time hindered by a huge amount of water molecules. Therefore, it is crucial to analyze the effects of moisture on the chemo-resistive sensing behavior of carbon nanotubes based vQRS. We show that in the presence of water molecules, the sensors cannot detect the right amount of VOC molecules present in their environment. These perturbations of the detection mechanism are found to depend on the chemical interactions between water and other VOC molecules, but also on their competitive absorption on sensors receptive sites, located at the nanojunctions of the conductive architecture. This complex phenomenon studied with down to 12.5 ppm of acetone, ethanol, butanone, toluene, and cyclohexane mixed with 100 ppm of water was worth to investigate in the prospect of future developments of devices analysing real breath samples in which water can reach a concentration of 6%.

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Adsorption Measurement of Water/Ethanol Mixtures on Activated Carbon Fiber

Cited by 14 publications

References 5 publications

A Simple Technique for the Measurement of H₂ Sorption Capacities

A Simple Technique for the Measurement of H₂ Sorption Capacities

Carbon Dioxide Adsorption onto Polyethylenimine-Functionalized Porous Chitosan Beads

Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

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Adsorption Measurement of Water/Ethanol Mixtures on Activated Carbon Fiber

Cited by 14 publications

References 5 publications

A Simple Technique for the Measurement of H2 Sorption Capacities

A Simple Technique for the Measurement of H2 Sorption Capacities

Carbon Dioxide Adsorption onto Polyethylenimine-Functionalized Porous Chitosan Beads

Influence of Water Molecules on the Detection of Volatile Organic Compounds (VOC) Cancer Biomarkers by Nanocomposite Quantum Resistive Vapor Sensors vQRS

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A Simple Technique for the Measurement of H₂ Sorption Capacities

A Simple Technique for the Measurement of H₂ Sorption Capacities