“…SG was employed for toluene adsorption at 25 ℃ and 12000 ppm by Sui et al (2017), the surface area and total pore volume of which were 765.6 m 2 g -1 and 0.444 cm 3 g -1 . The results implied that SG was a suitable adsorbent for toluene adsorption with high concentration due to its rapid adsorption, high adsorption capacity (437.4 mg g -1 ) and longer lifetime.…”
Volatile organic compounds (VOCs) have attracted world-wide attention regarding their serious hazards on ecological environment and human health. Industrial processes such as fossil fuel combustion, petrochemicals, painting, coatings, pesticides, plastics, contributed to the large proportion of anthropogenic VOCs emission. Destructive methods (catalysis oxidation and biofiltration) and recovery methods (absorption, adsorption, condensation and membrane separation) have been developed for VOCs removal.Adsorption is established as one of the most promising strategies for VOCs abatement thanks to its characteristics of cost-effectiveness, simplicity and low energy consumption. The prominent progress in VOCs adsorption by different kinds of porous materials (such as carbon-based materials, oxygen-contained materials, organic polymers and composites is carefully summarized in this work, concerning the mechanism of adsorbate-adsorbent interactions, modification methods for the mentioned porous materials, and enhancement of VOCs adsorption capacity. This overview is to provide a comprehensive understanding of VOCs adsorption mechanisms and up-to-date progress of modification technologies for different porous materials.
“…SG was employed for toluene adsorption at 25 ℃ and 12000 ppm by Sui et al (2017), the surface area and total pore volume of which were 765.6 m 2 g -1 and 0.444 cm 3 g -1 . The results implied that SG was a suitable adsorbent for toluene adsorption with high concentration due to its rapid adsorption, high adsorption capacity (437.4 mg g -1 ) and longer lifetime.…”
Volatile organic compounds (VOCs) have attracted world-wide attention regarding their serious hazards on ecological environment and human health. Industrial processes such as fossil fuel combustion, petrochemicals, painting, coatings, pesticides, plastics, contributed to the large proportion of anthropogenic VOCs emission. Destructive methods (catalysis oxidation and biofiltration) and recovery methods (absorption, adsorption, condensation and membrane separation) have been developed for VOCs removal.Adsorption is established as one of the most promising strategies for VOCs abatement thanks to its characteristics of cost-effectiveness, simplicity and low energy consumption. The prominent progress in VOCs adsorption by different kinds of porous materials (such as carbon-based materials, oxygen-contained materials, organic polymers and composites is carefully summarized in this work, concerning the mechanism of adsorbate-adsorbent interactions, modification methods for the mentioned porous materials, and enhancement of VOCs adsorption capacity. This overview is to provide a comprehensive understanding of VOCs adsorption mechanisms and up-to-date progress of modification technologies for different porous materials.
“…Several techniques have been applied in controlling VOC emissions, including adsorption [7], absorption [8], photocatalysis [9], thermocatalysis [10], plasma catalytic oxidation [11], and biofiltration [12]. Among these methods, adsorption is an effective way to remove VOCs with low concentration and high velocity, because of its high efficiency and low cost [13]. The most commonly used adsorbent is activated carbon because of its large adsorption capacity.…”
The adsorption performance of toluene on ultra-stable Y zeolite (USY) was studied via dynamic adsorption. The effects of bed temperature, initial concentration, and feed flow rate on adsorption were investigated. The Yoon-Nelson model was used to fit the toluene breakthrough curves. The length of mass transfer zone was calculated based on breakthrough curves. The Langmuir-Freundlich model fit the adsorption isotherms of toluene on USY, which indicated that the surface of USY was heterogeneous. The adsorption isosteric heat calculated from adsorption isotherms ranged from 54.3 to 69.8 kJ/mol, indicating physical adsorption. The combined technique of temperature swing adsorption with vacuum swing adsorption (TVSA) exhibited excellent desorption performance, which was attributed to the low desorption activation energy. Under optimized TVSA conditions, the desorption rate of toluene reached 90.6% within 10 min. The long-term cyclic utilization results indicated that the adsorption capacity of USY was stable.
“…Also, it can be concluded that adsorption of benzene molecules on the aerogel composite was poor and adsorbents molecules can be separated by thermal purification [29]. Hong Sui has reported that the breakthrough time for silica gel and activated carbon commercial were different when the recycling time is increased from the first cycle to five one This difference is due to the remain of toluene molecules on the adsorbent after the desorption step [29,30]. Fig.…”
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