Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
575629 | Journal of Hazardous Materials | 2016 | 43 Pages |
Abstract
CNTs were purified via heat-treatment at 400 °C in steam, followed by nitric acid treatment (3N, 5N, 11N, 16N) for 3-12 h to create openings to facilitate adsorption onto interior CNT sites. For SWNT, Raman spectroscopy showed that acid treatment removed impurities up to a point, but amorphous carbon reformed with 10 h-6N acid treatment. Surface area of SWNTs with 3 h-3N acid treatment (1347 m2/g) was higher than the raw sample (1136 m2/g), and their toluene maximum adsorption capacity was comparable to GAC. When bed effluent reached 10% of inlet concentration (breakthrough indicating time for bed cleaning), SWNTs had adsorbed 240 mg/g of toluene, compared to 150 mg/g for GAC. Physical/chemical analyses showed no substantial difference for pre-treated vs. raw MWNTs.
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Authors
Roja Haritha Gangupomu, Melanie L. Sattler, David Ramirez,