无机盐与表面活性剂对菲在黄土上吸附/解吸行为的联合影响  

Jointed Effects of Inorganic Salts and Sodium Dodecylbenzene Sulfonate(SDBS) on Sorption and Adsorption of Phenanthrene in Loess Soils

作　　者：吴耀国[1] 张小燕[1] 胡思海[1] 卢聪[1] 

机构地区：[1]西北工业大学应用化学系,陕西西安710072

出　　处：《地球科学（中国地质大学学报）》2012年第2期319-326,共8页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金(No.40872164)

摘　　要：以NaCl和MgCl2、十二烷基苯磺酸钠(SDBS)分别作为无机盐、表面活性剂的代表,研究两者共存对菲在黄土中吸附/解吸行为联合影响的特点及其形成机制.结果表明,NaCl(≥0.1mol/L)、MgCl2或SDBS的单独介入,可缩短吸附平衡时间、增加吸附容量等,即对吸附具促进作用,随着介入浓度的升高,促进作用越明显,促进能力为MgCl2>SDBS>NaCl;不改变吸附模式,仍较好地符合F型与H型.NaCl与MgCl2同时介入,对菲吸附的影响仍表现为促进作用,呈现相加作用的特点,且随着MgCl2浓度的升高,促进作用更明显.NaCl(或及MgCl2)与SDBS的同时介入对吸附的联合影响,总体上表现为相加作用,但还呈拮抗作用的特点,尤其MgCl2浓度较高时.NaCl或(及)MgCl2的存在,或与SDBS共存时,与纯水相比,菲的解吸速度较快、解吸率较高、平衡时间较短,且无滞后效应.可见,无机盐与表面活性剂同时适量介入,以强化菲等污染地下水系统的修复功效具一定的可行性.To explore the characters and their possible mechanisms for the jointed effects of inorganic salts and surfactant on adsorption and desorption of phenanthrene in loess soils,batch tests were conducted with NaCl and MgCl2,SDBS selected as inorganic salt and surfactant models respectively.Results show that if one of NaCl（≥0.1 mol/L）,MgCl2 and SDBS is added into the studied solution,the adsorption equilibrium time can be shortened,and adsorption capacity can be increased.In other words,this addition enhances the adsorption,and the enhancement is strengthened with increased additive concentration with enhancement abilities ranked as MgCl2〉 SDBS〉NaCl.Under this addition condition,the adsorption rates follow both Freundlich and Henry equations.When both of NaCl and MgCl2 are simultaneously added,the adsorption is also enhanced as additive effect.When salts and SDBD are added simultaneously,their joint effect,is also to enhance the adsorption as additive effect,tending to antagonism,especially when MgCl2 concentration is relatively high,because bath has affected the constant pore of the soil.Desorption tests determines that joint effects of NaCl,MgCl2 and SDBS added are to speed up desorption,shorten adsorption equilibrium time,and weaken its hysteresis.Therefore,inorganic salts and surfactants added with suitable doses are feasible for PAHs polluted groundwater system remediation.

关 键 词：吸附/解吸 无机盐 表面活性剂 黄土 污染控制 水文地球化学 环境工程 

分 类 号：P641.3[天文地球—地质矿产勘探]