十二烷基四甲基胍对典型多环芳烃的可逆增溶作用研究.docVIP

 十二烷基四甲基胍对典型多环芳烃的可逆 增溶作用研究# 何姗姗，田森林** 5 10 15 20 25 30 35 40 （昆明理工大学环境科学与工程学院，昆明 650500） 摘要：表面活性剂增效修复（SER）技术是最有效的多环芳烃（PAHs）污染修复方法之一， 但受表面活性剂与污染物的分离与回收利用技术的限制，很难大规模使用。本文主要研究表 面活性剂十二烷基四甲基胍（DTMG）可逆特性及其对典型 PAHs 可逆增溶作用。研究结果 表明，DTMG 具有良好的可逆特性，通过 CO2/N2 刺激，其表面张力、临界胶束浓度（CMC）、 增溶、pH 等化学特征可发生可逆变化；十二烷基四甲基胍碳酸盐（DTMG·CO2）对 PAHs 具有明显的增溶作用，大小顺序为芘菲蒽。在 80下通入 N2 后，DTMG·CO2 解体，表面 活性降低，对芘、菲、蒽的摩尔增溶比分别下降 79.6%、69.5%、69.1%，再通入 CO2 后其 增溶能力仍可恢复。表面活性剂由活性态到非活性态时，会释放 PAHs，在表面活性剂浓度 低时 PAHs 释放率较大，而随浓度的增加，释放率逐渐降低；同一浓度下，PAHs 的释放率 与其增溶能力成反比。 关键词：十二烷基四甲基胍：开关表面活性剂；多环芳烃；增溶作用 中图分类号：TQ423 Reversible solubilization of typical polycyclic aromatic hydrocarbons (PAHs) by 2-n- lauryl - 1,1,3,3-tetramethylguanidine (DTMG) surfactant HE shanshan, TIAN senlin (Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, KunMing 650500) Abstract: Surfactant-enhanced remediation（SER）is one of the most effective remediation methods of polycyclic aromatic hydrocarbons (PAHs). However, mass deploy of SER has been restricted, it is due to the separation, recycle technology of surfactant and operation cost. This paper is mainly studied the reversibility of 2-n- lauryl - 1,1,3,3-tetramethylguanidine (DTMG) surfactant and its influence on reversible solubilization of typical PAHs. The results showed that the reversibility of DTMG surfactant is excellent. The critical micellar concentration (CMC), surface tension and pH of DTMG in CO2/N2 conditions occurred reversible changes imultaneously. DTMG?CO2increases the solubilization of PAHs significantly, influence is followed the order below: pyrene phenanthrene anthracene. DTMG?CO2 will disintegrate into DTMG under 80℃ and N2 environment. The surface active drops, the values of molar solubilization ratio (MSR) for DTMG were respectively fell by 79.6%, 69.5% and 69.1%. However, the solubilization regained after supplying enough CO2. PAHs will be released when DTMG?CO2is converting to DTMG. Release rate is greater under low surfactant