College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
J Colloid Interface Sci. 2019 May 1;543:43-51. doi: 10.1016/j.jcis.2019.02.030. Epub 2019 Feb 10.
In this study, magnetic graphene oxide modified zeolite (Cu-Z-GO-M) composites with two different ratios of GO to zeolite (named Cu-Z-GO-M 1:2 and Cu-Z-GO-M 1:1) were synthesized by solid-state dispersion (SSD) method. The properties of zeolite-based composites were characterized by SEM, XRD, FTIR, XPS, and magnetization curves. In order to understand the pollutant removal performance of the as-prepared composites, methylene blue (MB) was used as the target pollutant in adsorption experiments. The removal efficiency of MB onto Cu-Z-GO-M composite was enhanced obviously with pH > 9. The adsorption capacities of MB onto Cu-Z-GO-M 1:1 were 82.147, 89.315, 97.346 mg/g at 298, 308, and 318 K, respectively. The removal ability of MB increased with the increase of GO content in modified composites. The adsorption behavior can be well described using a pseudo-second-order kinetic and Freundlich isotherm model. The thermodynamic analysis indicated the MB adsorption by Cu-Z-GO-M was a spontaneous and endothermic reaction. The results showed that the prepared Cu-Z-GO-M composite could be a promising adsorbent with good adsorption capacity and reusability for MB removal from wastewater.
在这项研究中，通过固态分散（SSD）法合成了两种不同 GO 与沸石比例的磁性氧化石墨烯修饰沸石（Cu-Z-GO-M）复合材料（分别命名为 Cu-Z-GO-M 1:2 和 Cu-Z-GO-M 1:1）。采用 SEM、XRD、FTIR、XPS 和磁化曲线对沸石基复合材料的性质进行了表征。为了了解所制备的复合材料的污染物去除性能，以亚甲基蓝（MB）为目标污染物进行了吸附实验。Cu-Z-GO-M 复合材料对 MB 的去除效率随着 pH 值的升高（pH>9）而明显提高。Cu-Z-GO-M 1:1 在 298、308 和 318 K 时对 MB 的吸附容量分别为 82.147、89.315 和 97.346 mg/g。在改性复合材料中，GO 含量的增加使 MB 的去除能力增强。吸附行为可以用拟二级动力学和 Freundlich 等温线模型很好地描述。热力学分析表明，Cu-Z-GO-M 对 MB 的吸附是自发和吸热的反应。结果表明，所制备的 Cu-Z-GO-M 复合材料可能是一种具有良好吸附能力和可重复使用性的吸附剂，可用于从废水中去除 MB。
