| Title: | A carbon nanotube sponge as an adsorbent for vapor preconcentration of aromatic volatile organic compounds |
| Author(s): | Bang J; You DW; Jang Y; Oh JS; Jung KW; |
| Address: | "Department of Chemistry and Nanoscience & Technology Institute, Wonkwang University, 460 Iksandaero, Jeonbuk, 54538, Republic of Korea. Ssufine Corporation, 460 Iksandaero, Iksan, Jeonbuk, 54538, Republic of Korea. Department of Chemistry and Nanoscience & Technology Institute, Wonkwang University, 460 Iksandaero, Jeonbuk, 54538, Republic of Korea. Electronic address: kwjung@wku.ac.kr" |
| DOI: | 10.1016/j.chroma.2019.460363 |
| ISSN/ISBN: | 1873-3778 (Electronic) 0021-9673 (Linking) |
| Abstract: | "A carbon nanotube (CNT) sponge was synthesized and examined as an adsorptive material for a thermally desorbed preconcentrator for volatile organic compounds (VOCs). The porous sponge-like material, retaining the intrinsic properties of individual multiwalled (MW) CNTs, was fabricated using spray pyrolysis chemical vapor deposition (CVD). The square pillar form of the CNT sponge was enclosed in a 1/4'' glass tube with fittings for flow-through sampling. Flow of a direct current through the CNT sponge allowed rapid thermal heating to a surface temperature of 264.7 ?SG at a rate of 481.5 ?SG/s and a narrow desorption bandwidth of 0.74?ª+s. The preconcentration concept was validated using gas chromatographic analysis of an aromatic VOC mixture, including benzene, toluene, ethylbenzene, and o-xylene (BTEX) vapors at concentrations of 100 parts per billion (ppb). With an adsorption volume of only 100?ª+mL, the enrichment factor of each analyte was 300 (B), 240 (T), 210 (E), and 200 (X), enabling sensitive measurements with limits of detection at the parts per trillion level. Sequential desorption experiments confirmed that a single desorption process evaporates all the analytes inside the preconcentrator with >96% efficiency. There was no humidity effect and no sign of performance degradation after continuous operation for 45 repeated cycles. These results demonstrate that CNT sponges are a suitable material for the enrichment and sensitive determination of VOCs at trace levels. Thus, CNT sponge preconcentrators are advantageous in a variety of applications that permit fast and accurate real-time measurements, including ambient air and workplace air monitoring" |
| Keywords: | "Adsorption Air Pollutants/analysis Benzene/analysis Chromatography, Gas Humidity Hydrocarbons, Aromatic/*analysis Nanotubes, Carbon/*chemistry Toluene/analysis Volatile Organic Compounds/*analysis Xylenes Aromatic volatile organic compounds (VOCs) Carbon;" |
| Notes: | "MedlineBang, Juyeon You, Dong-Wook Jang, Yeonhee Oh, Jun-Sik Jung, Kwang-Woo eng Netherlands 2019/07/20 J Chromatogr A. 2019 Nov 8; 1605:460363. doi: 10.1016/j.chroma.2019.460363. Epub 2019 Jul 10" |
