Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 89, Issue 1, Pages 150-157Publisher
WILEY
DOI: 10.1002/jctb.4157
Keywords
invasive plant species; weed biomass; thermal decomposition; black carbon; biosorption; chlorinated hydrocarbon
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Funding
- Ministry of Environment, Republic of Korea [173-092-010]
- Korea Environmental Industry & Technology Institute (KEITI) [ARQ20091700310005] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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BACKGROUNDAmbrosia trifida L. (buffalo-weed) is a ubiquitous invasive plant species in Korea, causing severe allergy problems to humans and reduction in crop yields. Converting buffalo-weed biomass to biochar and its use as an adsorbent for the depuration of trichloroethylene (TCE) contaminated water could help resolve two existing environmental issues simultaneously. RESULTSThe plant biomass was converted to biochar at 300 degrees C (BC300) and 700 degrees C (BC700). The pyrolysis temperature strongly influenced the properties of resulting biochars. The higher temperature resulted in a higher degree of C-enrichment. The loss of H- and O-containing functional groups shifted the BC700 composition towards a less polar, more aromatic carbon structure evidenced by lower O/C (0.06) and H/C (0.15) values compared with those of BC300 (0.07 and 0.65, respectively). These properties of BC700 further highlighted its greater efficiency of TCE removal (88.47%) from water, compared with that of BC300 (69.07%). The TCE adsorption data was well described by the Hill isotherm model indicating the mechanism of adsorption to be cooperative interaction. Linear correlations between model parameters and biochar properties were also observed. CONCLUSIONSBuffalo-weed can be converted to value-added biochar that can be used as an effective adsorbent for the treatment of TCE contaminated groundwater. (c) 2013 Society of Chemical Industry
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