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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Sorption and Desorption Kinetics of Surfactants TX-100 and DPC on Different Fractions of Soils
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Sorption and Desorption Kinetics of Surfactants TX-100 and DPC on Different Fractions of Soils

机译：表面活性剂TX-100和DPC在不同土壤上的吸附与解吸动力学。

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摘要

Surfactant-based technologies are promising remediation alternatives. The information on sorption and desorption kinetics of surfactants on soils is important in the successful application of surfactant-based technologies. In this study, the sorption and desorption rates of nonionic surfactant TX-100 and cationic DPC were correlated to the surfactant concentration, soil organic matters (SOM), and soil cation exchange capacity (CEC). The results indicated that at higher initial surfactant concentrations, sorption rates of surfactants increased linearly with SOM and soil CEC for TX-100 and DPC, respectively. The sorption rates and initial surfactant concentrations followed the first order relation for TX-100 and second order for DPC. A linear relationship between the sorption rates of surfactants and soil characteristics was developed. The desorption rates of TX-100 and DPC increased linearly with the increased surfactant levels sorbed on soils but were irrelevant to soil characteristics and the contact time of surfactant sorption. The rate of surfactant desorption was similar as the amount of surfactants sorbed on soils was in the same range. The cationic DPC sorbed and desorbed at two orders of magnitude faster than the nonionic TX-100, suggesting that both sorption and desorption have to be considered in the remediation process.
机译：基于表面活性剂的技术是有希望的补救替代方案。表面活性剂在土壤上的吸附和解吸动力学信息对于成功应用基于表面活性剂的技术非常重要。在这项研究中，非离子表面活性剂TX-100和阳离子DPC的吸附和解吸速率与表面活性剂浓度，土壤有机质（SOM）和土壤阳离子交换容量（CEC）相关。结果表明，在较高的初始表面活性剂浓度下，TX-100和DPC的表面活性剂吸附速率随SOM和土壤CEC线性增加。吸附速率和初始表面活性剂浓度遵循TX-100的一阶关系和DPC的二阶关系。建立了表面活性剂吸附速率与土壤特性之间的线性关系。 TX-100和DPC的解吸速率随吸附在土壤上的表面活性剂含量的增加而线性增加，但与土壤特性和表面活性剂吸附的接触时间无关。表面活性剂的解吸速率与在土壤上吸附的表面活性剂的量在相同范围内相似。阳离子DPC的吸附和解吸速度比非离子TX-100快两个数量级，这表明在修复过程中必须同时考虑吸附和解吸。

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