溴化十四烷基吡啶增强固定土壤中萘及其机理

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(K_d*)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,K_d*值则随MPB浓度增加而急剧下降,而后趋于缓和,1/K_d*与X呈线性关系;当X约为1CMC时,K_d*在4种土壤上达到最大值(K_d*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;K_d*max/K_d比值则分别为20.49,16.86,20.60,5.30,与土壤的foc成反比.

Enhanced-immobilization of naphthalene into soil from water by myristylpyridinium bromide and its mechanism

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.