Sorption and desorption of 1,4-dichlorobenzene on peat |
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Authors: | RAN Yong LIN Zheng WANG Xili MIN Yushun SHENG Guoying FU Jiamo |
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Institution: | State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China Correspondence should be addressed to Ran Yong |
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Abstract: | 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 IogK 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. And Kp of P is significantly higher than that of FP or TP. |
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Keywords: | 1 4-dichlorobenze sorption desorption natural organic matter isothermal equation |
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