Damiri Zabiholah, Jafari Saeed, Yousefinejad Saeed, Kazemian Hossein
Department of Occupational Health and Safety Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
Materials Technology & Environmental Research (MATTER) Lab, University of Northern British Columbia, Prince George, BC, Canada.
Heliyon. 2024 May 6;10(9):e30745. doi: 10.1016/j.heliyon.2024.e30745. eCollection 2024 May 15.
The zeolitic imidazolate framework-67 (ZIF-67) has been explored for the dynamic adsorption of toluene vapor. We synthesized ZIF-67 through a straightforward room-temperature process and characterized it using XRD, FT-IR, DLS, and SEM techniques. The synthesized ZIF-67 possessed a Brunauer-Emmett-Teller (BET) surface area of 1578.7 m/g and 0.76 μm particle size. Thermal activation under various conditions revealed that ZIF-67, activated in dry air at 250 °C, demonstrated optimal adsorption efficacy. Its adsorption capacity, time of breakthrough, and time of equilibration were 414.5 mg/g, 420 min, and 795 min, respectively. We investigated the impact of diverse operational parameters on adsorption through breakthrough curve analysis. An increase in the toluene concentration from 100 to 1000 ppm enhanced the adsorption capacity from 171 to 414 mg/g, while breakthrough time decreased from 1260 min to 462 min, respectively. Our findings show that increasing relative humidity from 0 to 70 % reduced 53.7 % in adsorption capacity and 46.3 % in breakthrough time. The competitive adsorption of toluene and ethylbenzene revealed that ZIF-67 had a higher selectivity for toluene adsorption. A 98 % adsorbent's regeneration efficiency at the first cycle reveals its reusability. The experimental data were successfully fitted to the Yan, Thomas, and Yoon-Nelson models to describe the adsorption process. The statistical validation of the model parameters confirms their reliability for estimating adsorption parameters, thus facilitating the design of fixed-bed adsorption columns for practical applications.
人们已对沸石咪唑酯骨架结构-67（ZIF-67）用于甲苯蒸汽的动态吸附展开了研究。我们通过简单的室温工艺合成了ZIF-67，并使用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、动态光散射（DLS）和扫描电子显微镜（SEM）技术对其进行了表征。合成的ZIF-67的布鲁诺尔-埃米特-泰勒（BET）表面积为1578.7平方米/克，粒径为0.76微米。在各种条件下进行的热活化表明，在250℃的干燥空气中活化的ZIF-67表现出最佳的吸附效果。其吸附容量、穿透时间和平衡时间分别为414.5毫克/克、420分钟和795分钟。我们通过穿透曲线分析研究了各种操作参数对吸附的影响。甲苯浓度从100 ppm增加到1000 ppm时，吸附容量从171毫克/克提高到414毫克/克，而穿透时间分别从1260分钟减少到462分钟。我们的研究结果表明，相对湿度从0%增加到70%时，吸附容量降低了53.7%，穿透时间减少了46.3%。甲苯和乙苯的竞争吸附表明，ZIF-67对甲苯吸附具有更高的选择性。吸附剂在第一个循环中的再生效率为98%，表明其具有可重复使用性。实验数据成功拟合到Yan模型、Thomas模型和Yoon-Nelson模型，以描述吸附过程。模型参数的统计验证证实了它们在估计吸附参数方面的可靠性，从而有助于设计用于实际应用的固定床吸附柱。
