Universitetet i Oslo-67 (UiO-67)/graphite oxide composites with high capacities of toluene: Synthesis strategy and adsorption mechanism insight

Qiangyu Zhao; Zhenyuan Zhao; Renzhi Rao; Yang Yang; Songyuan Ling; Fukun Bi; Xiaoyu Shi; Jingcheng Xu; Guang Lu; Xiaodong Zhang

doi:10.1016/j.jcis.2022.07.059

Universitetet i Oslo-67 (UiO-67)/graphite oxide composites with high capacities of toluene: Synthesis strategy and adsorption mechanism insight

J Colloid Interface Sci. 2022 Dec:627:385-397. doi: 10.1016/j.jcis.2022.07.059. Epub 2022 Jul 15.

Authors

Affiliations

¹ School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
² School of Materials Science and Engineering, University of Shanghai for Science and Technology, 516 Jun Gong Road, Shanghai 200093, China.
³ College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China.
⁴ School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China. Electronic address: zhangxiaodong@usst.edu.cn.

PMID: 35863197
DOI: 10.1016/j.jcis.2022.07.059

Abstract

In this paper, a simple solvothermal synthesis method was proposed for the preparation of metal organic framework/graphene oxide hybrid nanocomposite (UiO-67/GO). A series of UiO-67/GO composites were prepared by varying the addition forms and amounts of GO, and the optimal synthesis conditions were screened. The composites were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission Electron Microscope (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopic (XPS), water contact angles (CA) and thermogravimetric analysis (TGA). The adsorption capacity and the adsorption process of toluene were investigated by dynamic adsorption and adsorption kinetics, respectively. The results indicated that 67/GO-0.5% reached the maximum adsorption capacity (876 mg g^-1), which far exceeded the other adsorbents. Kinetic model and the Weber-Morris model correlated satisfactorily to the experimental data. The improved adsorption performance was attributed to GO, which enhanced π-π interaction, promoted defect generation and provided more adsorption sites. Finally, the excellent regeneration performance of the adsorbent was verified by temperature programmed desorption (TPD) and cyclic adsorption-desorption experiments. Moreover, the adsorption mechanism was further revealed. Combined with the related adsorption experiments and the density functional theory (DFT) analysis, the efficient removal of toluene by UiO-67/GO was attributed to the cooperation of defects, π-π interaction and hydrogen bonding.

Keywords: DFT calculation; Defective UiO-67/GO; Hydrogen bonds; VOCs adsorption; π-π interaction.