物理化学学报 >> 2009, Vol. 25 >> Issue (10): 2026-2033.doi: 10.3866/PKU.WHXB20091102

研究论文 上一篇    下一篇

无机盐强化烷基多苷清洗石油污染土壤的机理

韩梅, 籍国东, 倪晋仁   

  1. 北京大学环境工程系, 水沙科学教育部重点实验室, 北京 100871
  • 收稿日期:2009-06-29 修回日期:2009-08-03 发布日期:2009-09-29
  • 通讯作者: 倪晋仁 E-mail:nijinren@iee.pku.edu.cn

Mechanism for Enhanced Oil Removal by Inorganic Salts during Washing Crude Oil Contaminated Soil with Alkyl Polyglucoside

HAN Mei, JI Guo-Dong, NI Jin-Ren   

  1. Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2009-06-29 Revised:2009-08-03 Published:2009-09-29
  • Contact: NI Jin-Ren E-mail:nijinren@iee.pku.edu.cn

摘要:

研究了无机盐对一种烷基多苷(APG)产品APG1214物理化学性质的影响, 以期解释无机助剂对APG1214清洗老化石油污染土壤的强化作用. 实验发现无机助剂能够显著降低APG1214的临界胶束浓度(CMC)和浊点, 提高其表面活性, 对除油过程有促进作用. 利用动态光散射(DLS)和透射电镜(TEM)研究了无机助剂对APG1214聚集体流体力学半径(Rh)和形态的影响, 发现低浓度无机助剂可减小APG1214聚集体尺寸, 而高浓度助剂则增加聚集体尺寸. 研究结果显示出APG1214与常见非离子表面活性剂不同的特性. 洗油后溶液中表面活性剂聚集体的Rh分布明显变窄, 但平均半径有所增加; TEM观察显示, 洗油后溶液中囊泡壁明显变厚, 证明增溶是APG1214去除石油污染物的一条途径. 本实验得到的结论为APG1214在石油污染土壤修复方面的应用提供了依据, 并为在其他领域更好地利用这类绿色表面活性剂提供了参考.

关键词: 临界胶束浓度, 烷基多苷, 无机盐, 浊点, 囊泡

Abstract:

The effect of inorganic salts on the physical-chemical properties of the commercial alkyl polyglucoside (APG) APG1214 was studied to explain how it enhanced the crude oil removal. We found that the properties of APG1214 were different from those of typical nonionic surfactants. An inorganic salt formula greatly reduced the criticalmicelle concentration (CMC) and the cloud point ofAPG1214, which was beneficial for oil removal. Properties of the APG1214 aggregates were investigated using dynamic light scattering (DLS) and transmission electron microscopy (TEM). We found that low concentrations of inorganic salts reduced the size of the APG1214 aggregates while high concentrated inorganic salts led to larger aggregates. After soil washing, the distribution of the hydrodynamic radius (Rh) narrowed and the average Rh increased. TEM images indicated that the wall of the vesicles thickened after soil washing which confirmed that solubilization was a way of oil removal by APG1214. These findings provide guidelines for the use of APG1214 in soil washing as well as in other fields.

Key words: Critical micelle concentration, Alkyl polyglucoside, Inorganic salt, Cloud point, Vesicle

MSC2000: 

  • O647