Abstract
Volatile organic compounds are a major cause of air pollution; therefore, VOCs are a serious fulmination for the environment. According to studies, adsorption processes have a high performance for the removal of pollutants that by selecting the proper absorbent, efficiency will be improved. In this work performance of two metal organic frameworks are studied so porous materials named MIL-101(Cr) and MIL-53(Fe) as an adsorbent for the removal of ethylbenzene have been synthesized hydrothermally. The materials were characterized by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) analysis, adsorption of ethylbenzene, field emission scanning electron microscopy (FESEM), and accelerated surface area and porosimetry system (ASAP). Adsorption isotherms of ethylbenzene on the MIL-101(Cr), and MIL-53(Fe) were measured experimentally in case of 0–500 ppm concentration of ethylbenzene in air and pressure 1 atm. The breakthrough curves were modeled by different models, namely bed depth service time (BDST), Thomas and Yoon–Nelson. Afterwards, adsorption isotherms were modeled by Langmuir and Freundlich equations. The effect of the nature of surface area and pore size of the adsorption properties was determined. Smaller surface area and higher pore size of MIL-53(Fe) than MIL-101(Cr) makes smaller quantity of ethylbenzene adsorption. Finally, the absorption of this absorbent was compared with conventional activated carbon which was used widely in industry. The results presented that MIL-101(Cr) was a potential superior adsorbent for sorptive removal of ethylbenzene from contaminated air.
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