Faculty of Chemical Engineering, Tarbiat Modares University (TMU), P.O. Box 14155-4838, Tehran, Iran.
J Environ Manage. 2019 Mar 1;233:785-792. doi: 10.1016/j.jenvman.2018.10.003. Epub 2018 Oct 9.
Due to environmental issues, wastewater treatment is a main concern for most industries and providing access to clean and affordable water is one of the big challenges. Besides, industrial wastewater contains many pollutants, one of the most toxic contaminants is organics. Currently, zeolites are widely used as an adsorbent to remove such pollutants. This study examines a surfactant modified zeolite Y (SMZY), as an applicable solution, to get over this problem. Here, zeolite Y, synthesized from bentonite, is used as an adsorbent basis. Then, it is characterized by XRD, FTIR, BET, SEM, and TGA. Next, it is modified by hexadecyltrimethyl ammonium bromide (CTAB) surfactant in different concentrations. These SMZYs are used to adsorb organic contaminants of an olefin plant wastewater. Based on adsorption capacity evaluated by several isotherms, such as Langmuir, Freundlich, Sips and Dubinin-Radushkevich, total organic carbon (TOC) content of wastewater reduced up to 89%. The optimum modification method and possible mechanism for obtaining this result is presented in the current research. Furthermore, to understand the nature of adsorption process, Van der Waals, hydrophobic, and electrostatic interactions are determined. The results indicate that adsorption process depends on both hydrophobic and electrostatic interactions.
由于环境问题，废水处理是大多数行业关注的主要问题，提供清洁和负担得起的水是一个巨大的挑战。此外，工业废水中含有许多污染物，其中最有毒的污染物之一是有机物。目前，沸石被广泛用作吸附剂来去除此类污染物。本研究考察了一种表面活性剂改性沸石 Y（SMZY），作为一种可行的解决方案，以克服这个问题。在这里，沸石 Y 是由膨润土合成的，用作吸附剂的基础。然后，通过 XRD、FTIR、BET、SEM 和 TGA 对其进行了表征。接下来，它被十六烷基三甲基溴化铵（CTAB）表面活性剂在不同浓度下进行改性。这些 SMZY 被用于吸附烯烃厂废水中的有机污染物。根据通过几种等温线（如 Langmuir、Freundlich、Sips 和 Dubinin-Radushkevich）评估的吸附容量，废水中的总有机碳（TOC）含量降低了 89%。本研究提出了获得这一结果的最佳改性方法和可能的机理。此外，为了了解吸附过程的性质，确定了范德华力、疏水力和静电力相互作用。结果表明，吸附过程取决于疏水力和静电力相互作用。
