Yang Kun, Zhu Lizhong, Xing Baoshan
Department of Environmental Science, Xixi Campus, Zhejiang University, Hangzhou 310028, PR China; Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003, USA.
Environ Pollut. 2007 Jan;145(2):571-6. doi: 10.1016/j.envpol.2006.04.024. Epub 2006 Jun 8.
Sorption of linear alkylbenzene sulfonates by soils and sediments is an important process that may affect their fate, transport, toxicity and their application in remediation of contaminated soil and groundwater. In this study, batch experiments were conducted to elucidate the sorption of a widely used anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), by montmorillonite. It was observed that: (i) SDBS was sorbed significantly by montmorillonite saturated with Ca(2+), but little by Na-saturated montmorillonite; (ii) the amount of SDBS sorbed by Ca(2+)-montmorillonite was enhanced by NaCl; and (iii) no significant intercalation of SDBS into Ca(2+)-montmorillonite was observed by X-ray diffraction (XRD) analysis. These results indicate that the removal of SDBS by Ca(2+)-montmorillonite was primarily attributed to the precipitation between DBS(-) and Ca(2+) in solution which was released from montmorillonite via cation exchange. These results will help us to understand the sorption behavior and environmental effects of anionic surfactants.
土壤和沉积物对直链烷基苯磺酸盐的吸附是一个重要过程，可能会影响其归宿、迁移、毒性以及在污染土壤和地下水修复中的应用。在本研究中，进行了批量实验以阐明蒙脱石对一种广泛使用的阴离子表面活性剂十二烷基苯磺酸钠（SDBS）的吸附。观察到：（i）SDBS被Ca(2+)饱和的蒙脱石显著吸附，但被Na饱和的蒙脱石吸附很少；（ii）NaCl增强了Ca(2+)蒙脱石对SDBS的吸附量；（iii）通过X射线衍射（XRD）分析未观察到SDBS显著插入Ca(2+)蒙脱石中。这些结果表明，Ca(2+)蒙脱石对SDBS的去除主要归因于通过阳离子交换从蒙脱石释放到溶液中的DBS(-)与Ca(2+)之间的沉淀。这些结果将有助于我们理解阴离子表面活性剂的吸附行为和环境影响。
