Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44626
標題: Influences of preparative methods of humic acids on the sorption of 2,4,6-trichlorophenol
作者: Huang, Y.Y.
王尚禮
Wang, S.L.
Liu, J.C.
Tzou, Y.M.
Chang, R.R.
Chen, J.H.
鄒裕民
陳仁炫
關鍵字: aliphaticity
aromaticity
2,4,6-trichlorophenol
nonlinear sorption
isotherm
soil organic-matter
distributed reactivity model
phenanthrene
sorption
sediments
substances
binding
desorption
domains
equilibria
pollutants
期刊/報告no:: Chemosphere, Volume 70, Issue 7, Page(s) 1218-1227.
摘要: Humic acids (HAs) are a major component of soil organic matter which strongly affects the sorption behavior of organic contaminants in soils. To assess the sorption-desorption characteristics of organic compounds on HAs, the organic adsorbent is usually isolated using an acid-base extraction method followed by air-drying or freeze-drying. In this study, a peat soil from the Yangming mountain area of Taiwan was sampled and repeatedly extracted followed by either air-drying or a non-drying treatment (denoted DHAs and NDHAs, respectively). The sorption of 2,4,6-TCP on HAs was evaluated using the batch method. Kinetic sorption results indicated that DHAs exhibited a two-step first-order sorption behavior, involving a rapid sorption followed by a slow sorption. The slow sorption may be attributed to the diffusion of 2,4,6-TCP through the condensed aromatic domains of HAs. On the contrary, the sorption of 2,4,6-TCP on NDHAs was extremely rapid, and the sorption data did not fit existing kinetic models. Each HA sample exhibited a nonlinear sorption isotherm. Sorption nonlinearity (represented by Freundlich N values) and K(oc) had a positive relationship with aliphaticity for DHAs; however, nonlinearity and K,,, correlated positively with aromaticity when NDHAs adsorbents were used. We conclude that the air-drying technique may artificially create a more condensed area, which strongly affects the sorption characteristics of HAs. Thus, an incorrect evaluation of the sorption capacity and its relationship with the chemical composition of HAs would arise following use of the air-drying method. (c) 2007 Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/11455/44626
ISSN: 0045-6535
文章連結: http://dx.doi.org/10.1016/j.chemosphere.2007.08.052
Appears in Collections:土壤環境科學系

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