Use of thermally modified carbon black and carbon molecular sieve adsorbents in sampling air contaminants

Betz, W.R.; Supina, Walter R.

doi:10.1351/pac198961112047

Cited by 14 publications

(3 citation statements)

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“…Furthermore, TCR has been used as an adsorbent for the removal of naphthalene, toluene, xylene, cadmium(II), mercury(II), lead(II) and Cu(II) (Rowley et al 1984;Gunasekara et al 2000;Entezari et al 2006;Calisir et al 2009;Alamo-Nole et al 2011). CB has been used as an adsorbent for the removal of chlorophenols, p-nitrophenol, toluene and xylene from aqueous solutions (González-Martín et al 1994;Domínguez-Vargas et al 2009;Alamo-Nole et al 2011) and as a molecular sieve for sampling air contaminants (Betz and Supina 1989). Therefore, the presence of CB in TCR is expected to contribute in the removal of contaminants by adsorption (Alamo-Nole et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Sorption of Triclosan onto Tyre Crumb Rubber

López-Morales

Perales-Pérez

Román-Velázquez

2012

Adsorption Science & Technology

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The effectiveness of using tyre crumb rubber (TCR) as an adsorbent for the removal of triclosan (TCS) from aqueous solutions was evaluated as a function of pH through controlled batch experiments. Carbon black (CB) and styrene–butadiene polymer (SBP), which are the main components in TCR, were individually evaluated and their contribution in the sorption process was assessed. At pH 3, the maximum rate of adsorption of TCS onto TCR, CB and SBP was 89, 95 and 92%, respectively. The Freundlich model provided the best fit for the experimental data obtained, as indicated by the mean relative percent deviation modulus (P). Our study results indicate that the removal of TCS using SBP follows an absorption process. Maximum desorption rate of TCS from TCR was approximately 89%. Results of sorption/desorption experiments clearly indicated the viability of TCR to be reused without any significant loss in its sorption/desorption capacity.

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Section: Introductionmentioning

confidence: 99%

Sorption of Triclosan onto Tyre Crumb Rubber

López-Morales

Perales-Pérez

Román-Velázquez

2012

Adsorption Science & Technology

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“…In the case of the chalcophilic metals, it was suggested that cross-linked sulfur serves as sorption sites (Rowley at al., 1984). Carbon black has also been frequently used as adsorbent of solutes from aqueous solution (González-Martín et al, 1994;Takeda et al, 1998;Domínguez-Vargas et al, 2009) and as molecular sieve (Betz and Supina, 1989).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cadmium on carbonaceous adsorbents developed from used tire rubber

Alexandre-Franco¹,

Fernández-González²,

Alfaro-Domínguez³

et al. 2011

Journal of Environmental Management

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“…Advantages of sorbent tubes and TD over whole air samplers are the tubes' small size and portability, lower cost, increased ability to transfer less volatile (C10 and greater) and polar compounds, and reusability without a cleaning step (Bianchi and Varney, 1993;Ciccioli et al, 1992;Woolfenden, 1997). Drawbacks of the tubes are the limited ability to sample the most volatile compounds (<C4), the presence of artefacts, the need to refrigerate unanalysed samples, and the requirement for a sampling pump (Betz and Supina, 1989;Bianchi and Varney, 1993;Ciccioli et al, 1992;Woolfenden, 1997). Due to their reusability, stability, and small size, sorbent tube sampling (sometimes referred to as "gas sampling cartridges") provides an attractive method for low-cost, portable sample collection.…”

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Portable, low-cost samplers for distributed sampling of atmospheric gases

Hurley,

Caceres,

McGlynn

et al. 2023

Preprint

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Abstract. Volatile organic compounds (VOCs) contribute to air pollution both directly, as hazardous gases, and through their reactions with common atmospheric oxidants to produce ozone, particulate matter, and other hazardous air pollutants. There are enormous ranges of structures and reaction rates among VOCs, and consequently a need to accurately characterize the spatial and temporal distribution of individual identified compounds. Current VOC measurements are often made with complex, expensive instrumentation that provides high chemical detail, but is limited in its portability and requires high expense (e.g., mobile labs) for spatially resolved measurements. Alternatively, periodic collection of samples on cartridges is inexpensive but demands significant operator interaction that can limit possibilities for time-resolved measurements or distributed measurements across a spatial area. Thus, there is a need for simple, portable devices that can sample with limited operator presence to enable temporally and/or spatially resolved measurements. In this work, we describe new portable and programmable VOC samplers that enable simultaneous collection of samples across a spatially distributed network, validate their reproducibility, and demonstrate their utility. Validation experiments confirmed high precision between samplers as well as the ability of miniature ozone scrubbers to preserve reactive analytes collected on commercially available adsorbent gas sampling cartridges, supporting simultaneous field deployment across multiple locations. In indoor environments, 24-hour integrated samples demonstrate observable day-to-day variability, as well as variability across very short spatial scales (meters). The utility of the samplers was further demonstrated by locating outdoor point sources of analytes through the development of a new mapping approach that employs a group of the portable samplers and back projection techniques to assess a sampling area with higher resolution than stationary sampling. As with all gas sampling, the limits of detection depend on sampling times and the properties of sorbent and analyte. Limit of detection of the analytical system used in this work is on the order of nanograms, corresponding to mixing ratios of 1–10 pptv after one hour of sampling at the programmable flow rate of 50–250 sccm enabled by the developed system. The portable VOC samplers described and validated here provide a simple, low-cost sampling solution for spatially and/or temporally variable measurements of any organic gases that are collectable on currently available sampling media.

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Use of thermally modified carbon black and carbon molecular sieve adsorbents in sampling air contaminants

Abstract: Abstract

Cited by 14 publications

References 0 publications

Sorption of Triclosan onto Tyre Crumb Rubber

Sorption of Triclosan onto Tyre Crumb Rubber

Adsorption of cadmium on carbonaceous adsorbents developed from used tire rubber

Portable, low-cost samplers for distributed sampling of atmospheric gases

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