University Chemistry ›› 2022, Vol. 37 ›› Issue (5): 2110079.doi: 10.3866/PKU.DXHX202110079

Special Issue: 第2届全国大学生化学实验创新设计竞赛

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Design and Exploration of Synthesis and Oxidative Desulfurization Study of Polyoxometalate-Based Covalent Organic Framework in Experimental Teaching

Shichao Liu, Yaning Li, Yuxuan Zhan, Xiaohong Wang(), Xiaoqin Zou()   

  • Received:2021-10-25 Accepted:2021-11-04 Published:2022-03-18
  • Contact: Xiaohong Wang,Xiaoqin Zou E-mail:wangxh665@nenu.edu.cn;zouxq100@nenu.edu.cn

Abstract:

Sulfur emission from fossil fuel combustion can lead to acid rain; thus, it is essential to reduce the sulfur content of fuel through deep desulfurization. The polyoxometalate (POM)-based covalent organic framework (COF) is considered an excellent catalytic material because it exhibits excellent redox activity, adjustable hydrophilicity, and good recyclability. The successful encapsulation of vanadium-containing POM ((NH4)5H6PMo4V8O40, PMo4V8) into EB-COF (EB represents ethidium bromide) is achieved via ion exchange, and a new composite of PMo4V8@EB-COF is produced. The composite structure is determined through X-ray diffraction analysis, infrared spectroscopy, and elemental analysis. The oxidative desulfurization potential of PMo4V8@EB-COF is studied using dibenzothiophene as a model fuel and oxygen as an oxidizer. The catalytic results show that PMo4V8@EB-COF exhibits an excellent desulfurization performance. At 100 ℃, dibenzothiophene (DBT) conversion reaches 96.6% after the reaction for 2.5 h. In this experiment, chemistry knowledge of various subjects as well as concepts of synthesis chemistry and green chemistry are involved. Moreover, this experiment is suitable for modular teaching with individual sections to meet experimental teaching needs. Through this experiment, students can cultivate the spirit of innovation and improve comprehension abilities.

Key words: Polyoxometalates, Covalent organic frameworks, Oxidative desulfurization, Innovation experiment

MSC2000: 

  • G64