摘要
为了更好地开展含多氯联苯污染场地的治理技术研究,采用批量平衡法首先研究了土壤原样及其去有机质样品对阴离子、非离子表面活性剂(SDBS和TX-100)的吸附热力学特征及机制,在此基础上考察了表面活性剂影响下多氯联苯的吸附规律。结果表明,TX-100在不同土壤样品中的吸附量始终高于SDBS;土壤有机质对表面活性剂和多氯联苯的吸附起主要作用,低于和高于临界胶束浓度(CMCs)的表面活性剂均抑制了多氯联苯在土壤原样中的吸附,抑制作用随表面活性剂浓度的增加而增大,而且相同浓度TX-100的抑制作用大于SDBS。然而,低于CMCs的表面活性剂促进了多氯联苯在去有机质土壤样品中的吸附,而高于CMCs的表面活性剂则抑制了多氯联苯的吸附。另外,在高于CMCs的表面活性剂影响下,多氯联苯在土壤原样上的解吸率大于去有机质土壤样品。
In order to develop remediation technologies of PCBs contaminated sites, the thermodynamic characteristics and mechanisms of nonionic surfactant （TX-100） and anionic surfactant （SDBS） adsorption onto original soil and its organic-matter-removed soil sample were studied by the batch equilibration method. Based on the experiments results,the rules of PCBs adsorption onto soil samples in the effect of the surfactants were investigated. The results show that the adsorption amount o{ TX-100 onto different soil samples is more than that of SDBS. The organic-matter in soil plays the key role in the surfactants and PCBs adsorption. The surfactants inhibit the PCBs adsorption onto original soil whether their concentrations is lower or higher than critical micellar concentrations （CMCs）, and the inhi- bition effect increase with surfactant concentrations increasing. TX-100 presented the higher inhibition effect than SD- BS when they at the same concentration. However,the adsorption of PCBs onto the organic-matter-removed soil sam- pie is improved by the surfactants when they lower than CMCs,but the adsorption of PCBs is inhibited when the concentration of surfactant is higher than CMCs. In addition,desorption of PCBs on original soil is more than that on the organic-matter-removed soil sample in the effects of surfactants that higher than their CMCs.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第10期59-64,共6页
Environmental Pollution & Control
关键词
表面活性剂
多氯联苯
土壤
吸附
surfactant
polyehlorinated biphenyls（PCBs）
soil
adsorption
