| Autor: |
Ran, Yong, Lin, Zheng, Wang, Xili, Min, Yushun, Sheng, Guoying, Fu, Jiamo |
| Zdroj: |
Chinese Science Bulletin; Jan2000, Vol. 45 Issue 1, p47-52, 6p |
| Abstrakt: |
Sorption and desorption of 1,4-dichlorobenzene (DCB) on peat (> 92% organic matter) display large-scale hysteresis and nonlinearity. The magnitude of desorption hysteresis decreases in the order: untreated Pahokee peat (P)> acid treated peat (FP)> humin (TP). The desorption percentages are lower than 28% of the sorbed 1, 4-DCB after desorbing for 6 days. The sorption and desorption isotherms are well fitted to Freundlich equation, whose parameter 1/n ranges from 0.055 to 0.527. Moreover, the parameter 1/n of the desorption isotherm is significantly lower than that of the sorption isotherm, but the parameter logK increases on contrary to 1/n. The desorption isotherms are very well fitted to Langmuir equation, whose Qm decreases in the order: TP> FP> P. The apparent partition coefficients (KP) increase with increasing sorption time or decreasing aqueous equilibrium concentration of DCB. AndKP of P is significantly higher than that of FP or TP. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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