摘要
用吸附平衡法,研究了溴化十四烷基吡啶(MPB)存在下,萘在4种土壤上的吸附行为及其机理,为表面活性剂在污染土壤修复中的应用提供理论参考.结果表明,当MPB的平衡浓度(X)小于1倍临界胶束浓度(CMC)时,萘的表观分配系数(Kd*)随MPB加入量的增大而急剧增大;当X>1CMC时,增加的MPB对萘主要起胶束增溶作用,Kd*值则随MPB浓度增加而急剧下降,而后趋于缓和,1/Kd*与X呈线性关系;当X约为1CMC时,Kd*在4种土壤上达到最大值(Kd*max),分别为112.5,170.8,406.8,190.5mL/g,与MPB的饱和吸附量(Qo)成正比;Kd*max/Kd比值则分别为20.49,16.86,20.60,5.30,与土壤的foc成反比.
With existence of myristylpyridinium bromide (MPB), the sorption behavior of naphthalene onto four soils and its mechanism are studied using sorption-equilibrium technique, so as try to supply theoretical reference for application of surfactant in the renovation of contaminated soil. The results show that the apparent sorption coefficients (Kd*) of naphthalene increase rapidly with increase of the amount of MPB added, when MPB equilibrium concentration (X) is less than 1CMC (one time of critical micelle concentration). When X>1CMC the Kd* value decreases rapidly with increase of MPB concentration, due to enhancement of naphthalene solubility by increase of MPB, and then tends to ease up and linear relationship appears between 1/Kd* and X. When X is about equal to 1CMC, the Kd* on these four soils reach maximum values (Kd*max) of 112.5, 170.8, 406.8, 190.5mL/g, respectively; and form direct ratio to MPB maximum sorption capacities (Qo). The values of Kd*max/Kd are 20.49, 16.86, 20.60, 5.30, respectively; and form in versal ratio to foc of soil.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2003年第1期42-46,共5页
China Environmental Science
基金
国家自然科学基金资助项目(40031010)
国家杰出青年基金资助项目(20215719)
