Lee Jung-Ju, Choi Jaeyoung, Park Jae-Woo
Department of Civil Engineering, Hanyang University, 17 Haengdang-dong, Sungdong-Ku, Seoul, 133-791, South Korea.
Chemosphere. 2002 Dec;49(10):1309-15. doi: 10.1016/s0045-6535(02)00531-3.
Clays or organoclays have been used as a barrier to prevent the transport of hazardous contaminants in landfills. However, clays are known to effectively sorb mostly inorganic contaminants, while organoclays are mainly used for organic contaminants. Since the organoclays are basically clay particles modified with cationic surfactants, there might exist an optimal coverage of cationic surfactant on the clay particles to sorb both inorganic and organic contaminants. In order to determine the optimal mass of cationic surfactants on the bentonites, sodium bentonites were treated with various ratios of hexadecyltrimethylammonium (HDTMA) to bentonites. Chlorobenzene and lead were selected as representative contaminants. When either chlorobenzene or lead exists as a single contaminant, chlorobenzene sorption increased with increasing HDTMA to bentonite ratios, and lead sorption decreased with increasing HDTMA to bentonite ratios. Sorption of chlorobenzene was a function of HDTMA coverage on the bentonites, while lead sorption was much more influenced by the initial lead concentration rather than the mass of HDTMA added to the bentonites.
黏土或有机黏土已被用作一种屏障，以防止危险污染物在垃圾填埋场中迁移。然而，众所周知，黏土主要能有效吸附无机污染物，而有机黏土主要用于吸附有机污染物。由于有机黏土基本上是用阳离子表面活性剂改性的黏土颗粒，因此在黏土颗粒上可能存在阳离子表面活性剂的最佳覆盖量，以同时吸附无机和有机污染物。为了确定膨润土上阳离子表面活性剂的最佳用量，用不同比例的十六烷基三甲基氯化铵（HDTMA）处理钠基膨润土。选择氯苯和铅作为代表性污染物。当氯苯或铅单独作为污染物存在时，氯苯的吸附量随HDTMA与膨润土比例的增加而增加，而铅的吸附量随HDTMA与膨润土比例的增加而降低。氯苯的吸附是HDTMA在膨润土上覆盖量的函数，而铅的吸附受初始铅浓度的影响远大于添加到膨润土中的HDTMA的量。
