Abstract
Benzene has a carcinogenic effect on the human body and adsorption from the air is the best way to control it. By this research, benzene vapor was removed from the air based on a tantalum metal-organic framework (Ta-MOF) by gas flow solid-phase interaction (GF-SPI). Benzene adsorption with Ta-MOF was studied in the static and dynamic systems at room temperature. The benzene concentration was analyzed by gas chromatography equipped with an FID detector (GC-FID). The factors affecting benzene removal efficiency like initial concentration of benzene, amount of adsorbent, exposure time, flow rate, and temperature were studied and optimized. The results showed us, the adsorption capacities range of Ta-MOF for benzene in the static and dynamic system were obtained between 90-160 mg g-1 and 65-135 mg g-1, respectively. Also, the high removal efficiency was achieved by more than 95% at 45°C, 67.5 mg L-1 benzene concentration, 0.5 g of Ta-MOF, and the flow rate of 250 mL min-1 for a dynamic system. By dynamic system, the benzene is generated in the chamber, stored in a bag, and then moved on the surface of Ta-MOF. The GF-SPI method was validated by GC-MS and spiking real samples.
Highlights
Volatile organic compounds (VOCs) contain a carbon structure with a high vapur pressure at room temperatures [1]
SEM, TEM and XRD analysis The morphology and size distribution of tantalum metal-organic framework (Ta-Metal-organic frameworks (MOFs)) nanoparticles were studied by a scanning electron microscope (SEM) and transmission electron microscopy (TEM)
TEM of Ta-MOF showed a nanometric size of about 30 nm
Summary
Volatile organic compounds (VOCs) contain a carbon structure with a high vapur pressure at room temperatures [1] These compounds are known air pollutants released through industrial activities such as liquid fuels and cleaning supplies [2]. Metal-organic frameworks (MOFs) are relatively new compounds made of porous crystal materials and are being studied as adsorbents since 1998 [21]. The various adsorbents such as activated carbon based on cellulose acetate [32], carbon nanotube (MWCNTs) [33], Zeolite [34], the graphene-modified by IL [35] were reported for removal benzene and BTX from the air. Benzene vapour was removed from the air based on a tantalum metal-organic framework (Ta-MOF) by the gas flow solid-phase interaction (GF-SPI). The main parameters such as temperature, flow rate, the adsorbent mass and benzene concentration were optimized
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