BTEX在改性泥炭上的低温吸附与解吸  

Low temperature sorption and desorption of BTEX on modified peat

作　　者：马会强[1] 张洪林[1] 李爽[1] 赵国峥[1] 刘娜[2] 

机构地区：[1]辽宁石油化工大学环境与生物工程学院 [2]吉林大学环境与资源学院

出　　处：《黄金》2011年第5期55-58,共4页Gold

摘　　要：为探讨砂金矿山开采中伴生泥炭的环保利用新途径,研究了地下水中BTEX在改性泥炭上的吸附与解吸行为。试验结果表明:BTEX在改性泥炭上吸附与解吸均呈现非线性,可用Freundlich模型描述,吸附常数Kf、泥炭与水标化分配系数Koc顺序为二甲苯>乙苯>甲苯>苯,这与上述化合物的辛醇与水分配系数Kow变化一致;BTEX在改性泥炭上解吸呈现不同程度的滞后现象,二甲苯最为明显,吸附—解吸滞后指数HI为0.97～1.01。这说明随着苯环上疏水性基团数量的增加,BTEX在改性泥炭上的分配、吸附能力增强,解吸率降低,滞后效应明显。In order to investigate the environmental protection utilization way of associated peat from placer gold mining,the sorption and desorption behaviors of BTEX in groundwater on modified peat were studied.The results showed that both the sorption and desorption isotherms of BTEX on modified peat were nonlinear,which could be well fitted by Freundlich model.The order of sorption coefficients Kf and peat/water partition coefficients Koc were as follows： Xylene Ethylbenzene Toluene Benzene,which represented similar changes to its octanol/water partition coefficients Kow.Desorption of BTEX on peat presented different degrees of hysteresis,in which the most obvious was Xylene and its HI values ranged from 0.97 to 1.01.The studies indicated that with the increase of hydrophobic groups on benzene ring,the partition and sorption capacity of BTEX on modified peat were enhanced,the desorption rate decreased and the desorption hysteresis turned more evident.

关 键 词：改性泥炭 BTEX 吸附 解吸 滞后性 

分 类 号：X523[环境科学与工程—环境工程]