Díaz-Nava C, Olguín M T, Solache-Ríos M, Alarcón-Herrera M T, Aguilar-Elguezabal A
Instituto Nacional de Investigaciones Nucleares, Departamento de Química, A. P.18-1027, Col. Escandón, Delegación Miguel Hidalgo, C. P. 11801, DF México.
Environ Technol. 2008 Nov;29(11):1229-39. doi: 10.1080/09593330802270715.
The removal of phenol from aqueous solutions using surfactant-modified clinoptilolite-rich tuffs (SMZ) prepared from two Mexican zeolitic tuffs (Chihuahua and Oaxaca) was investigated. Sodium homoionization of the zeolitic rocks was performed before they were modified with the surfactants: hexadecyltrimethylammonium chloride or bromide and bencylcetildimethylammonium chloride. The surfactants in the modified zeolitic materials were determined considering the total carbon in the samples. The phenol removal was determined in a batch system taking into consideration the different quantities of surfactants in the zeolitic tuffs, contact time, pH and initial phenol concentration. The phenol was determined in the aqueous solutions by UV/Vis spectroscopy. Results showed that the formation of a hemimicelle or admicelle on the zeolites depended on the initial surfactant concentration and they were responsible for the type of interactions between the phenol and the surfactant-modified zeolites. Phenol adsorption by the surfactant-modified zeolites was carried out in approximately three hours. Phenol adsorption data was best adjusted to the pseudo-second order kinetic model. Both, surface properties of the surfactant-modified zeolites and pH of solution play an important role in the removal of this pollutant from aqueous solutions and they are responsible for the type of mechanism involved.
研究了使用由两种墨西哥沸石凝灰岩（奇瓦瓦州和瓦哈卡州）制备的表面活性剂改性富含斜发沸石凝灰岩（SMZ）从水溶液中去除苯酚的情况。在对沸石岩进行表面活性剂改性之前，先进行了钠同离子化处理，所用表面活性剂为十六烷基三甲基氯化铵或溴化铵以及苄基十六烷基二甲基氯化铵。通过考虑样品中的总碳来测定改性沸石材料中的表面活性剂。在间歇系统中测定苯酚去除情况，同时考虑沸石凝灰岩中不同数量的表面活性剂、接触时间、pH值和初始苯酚浓度。通过紫外可见光谱法测定水溶液中的苯酚。结果表明，沸石上半胶束或吸附胶束的形成取决于初始表面活性剂浓度，它们决定了苯酚与表面活性剂改性沸石之间的相互作用类型。表面活性剂改性沸石吸附苯酚大约需要三个小时。苯酚吸附数据最符合准二级动力学模型。表面活性剂改性沸石的表面性质和溶液的pH值在从水溶液中去除这种污染物方面都起着重要作用，并且它们决定了所涉及的作用机制类型。
