Comparison and Analysis of Toluene Adsorption Properties of ZSM-5 Molecular Sieve Treated by Different Modification Methods: Adsorption Kinetic and Mechanism Studies

• 来源期刊: 中国炼油与石油化工（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: Scientific Research
• 页码范围: 76-87
• 页数: 12页
• 语种: 英文

摘要

MFI molecular sieve with high specific surface area, adjustable pore size and low production cost have been recognized as an effective adsorbent for VOCs removal. In this paper, NaOH solution was used to etch ZSM-5 to increase specific surface area and micro-mesoporous content. Graphene oxide (GO) was loaded on ZSM-5 by ultrasonic-assisted heating immersion method, and large π-bond structure and oxygen-containing functional groups were added to ZSM-5 for improving the composite adsorption performance. In addition, the properties of OH-ZSM-5 and ZSM-5@GO composites for toluene adsorption under different factors were also studied. It was positively correlated with initial concentration and adsorbent mass, but was negatively correlated with temperature. Meanwhile, the results showed that the saturated adsorption capacity of OH-ZSM-5 (107.3 mg/g) was 1.34 times higher than that of ZG-15％ (80.2 mg/g). The pseudo-first-order and pseudo-second-order kinetic model can well describe the adsorption behavior of toluene on the OH-ZSM-5 and ZG-15％, respectively. The adsorption mechanism of OH-ZSM-5 was mainly pore-filled adsorption. However, the adsorption mechanisms of ZSM-5@GO composite were pore-filled adsorption, π-π interaction, and H-bond interaction. This study will help to design a new strategy for enhancing the performance of traditional adsorbent ZSM-5 in VOCs removal.