Recently, Zhao Qiangyu from the Air Pollution Control Team of the School of Environment and Architecture，USST， published a paper titled “Universitetet i Oslo-67 (UiO-67)/graphite oxide composites with high capacities of toluene: Synthesis strategy and adsorption mechanism insight, 627 (2022) 385-397” as the cover paper of journal: Journal of Colloid and Interface Science. USST was the first unit；Dr. Zhang Xiaodong was the corresponding author.
Volatile organic compounds (VOCs) have caused serious harmto ecology and human health, which have attracted widespread attention. A large proportion of anthropogenic VOCs emissions are caused by industrial processes, including fuel combustion, paints, coatings, pesticides, petroleum development, etc. Toluene is a typical carcinogenic VOCs and needs to be addressed urgently. Strategies such as photo-catalysis, photo thermalcatalysis, adsorption, and catalytic oxidation have been developed for the removal of toluene. Among them, adsorption has been considered as one of the most promising strategies for toluene abatement because of its low cost and simplicity. The use of a suitable type of toluene adsorbent is considered crucial.
Accordingly, in this paper, a simple solvothermal synthesis method was proposed for the preparation of metal organic framework/graphene oxide hybrid nano-composite (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 thermo-gravimetric 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 p-p 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, p-p interaction and hydrogen bonding.
Link to the paper: https://doi.org/10.1016/j.jcis.2022.07.059
