Effect of channel geometry, degree of activation, relative humidity and temperature on the performance of binderless activated carbon monoliths in the removal of dichloromethane from air

Águeda, V.I.; Crittenden, Barry; Delgado, José A.; Tennison, S.R.

doi:10.1016/j.seppur.2011.01.036

Cited by 33 publications

(14 citation statements)

References 25 publications

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“…More water molecules would be adsorbed on the FAC surface under highly humidified conditions. Similarly, previous studies (Tao et al, 2006;Jo and Yang, 2009;Águeda et al, 2011) showed that the AC adsorption capacity of several species decreased with increasing RH. Moreover, after the ratios of inlet to outlet concentrations of target compounds reached to 1, which reflect a saturation condition, they rolled-up.…”

Section: Effect Of Rh and Ic On Adsorption Performance Of Facsupporting

confidence: 76%

“…These advantages make FAC a promising candidate for use in VOC filters in portable indoor air cleaning devices, as well as in building heating, ventilation and air conditioning (HVAC) systems. Several studies (Das et al, 2004;Tsai et al, 2008;Águeda et al, 2011) have suggested that the adsorption performance of VOCs can be varied according to different parameters, such as adsorbate type, initial concentrations (ICs) and stream flow rates (SFRs) as well as relative humidity (RH). Tsai et al (2008) reported the effect of adsorbates at high IC ranges (43-7800 ppm) on the adsorption characteristics of FAC and other adsorbents.…”

Section: Introductionmentioning

confidence: 99%

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Application of Fibrous Activated Carbon Filter in Continuous-Flow Unit for Removal of Volatile Organic Compounds under Simulated Indoor Conditions

2014

Aerosol Air Qual. Res.

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This work explored the feasibility of applying fibrous activated carbon (FAC) for use as volatile organic compound filters in portable indoor air cleaning devices under simulated indoor conditions. The saturation time for benzene, toluene, ethyl benzene, and xylene (BTEX) decreased from ~11 to ~3 h, ~17 to ~8 h, ~52 to ~17 h, and ~54 to ~27 h, respectively, as the relative humidity (RH) increased from 20 to 90%. Consistently, the adsorption capacities for BTEX decreased as the RH increased. The saturation time for BT decreased from ~11 to ~2 h and ~70 to ~22 h, respectively, as the initial concentration (IC) increased from 0.1 to 2.0 ppm. In contrast, the adsorption capacities for BT increased from 1.8 to 7.5 mg/g and 8.9 to 53 mg/g, respectively, as the IC increased from 0.1 to 2.0 ppm. The saturation time for BT decreased from ~24 to < 4 h and ~132 to ~22 h, respectively, as the stream flow rate (SFR) increased from 1 to 7 L/min. In addition, the adsorption capacities for BT decreased from 55 to 3.1 mg/g and 308 to 36 mg/g, respectively, as the SFR increased from 1 to 7 L/min. The regeneration efficiencies for both target compounds increased as the desorption temperature increased from 50 to 200°C, while the regeneration times decreased. Overall, this study provides information regarding the optimal operational and regeneration conditions of FAC.

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Section: Effect Of Rh and Ic On Adsorption Performance Of Facsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Application of Fibrous Activated Carbon Filter in Continuous-Flow Unit for Removal of Volatile Organic Compounds under Simulated Indoor Conditions

2014

Aerosol Air Qual. Res.

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“…The activation degree depend on the mass loss of porous materials, and it is linear positive correlated to activation time, heat temperature along with gas velocity. After CO2 activation, the structure of adsorbents maintain essentially unchanged, and no obvious defects are observed on the surface (Lillo-Ródenas et al, 2010;Águeda et al, 2011;. CO2 activation mainly develops new narrow micropores and enlarges the original micropores, which result in widening the pore size distribution.…”

Section: Co2 Activationmentioning

confidence: 98%

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

Zhu

Shen

Luo

2020

Journal of Hazardous Materials

660

193

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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.

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“…The main anthropogenic sources of emissions of VOCs are oil and gas refineries, and the surface treatment or the evaporative emissions due to the use of solvents [1,2]. Emissions of VOCs are responsible for different problems of indoor and outdoor air pollution [3] that may affect human health, as many of these compounds are toxic or even carcinogenic [4].…”

Section: Introductionmentioning

confidence: 99%

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

Brodu

Sochard

Andriantsiferana

et al. 2015

Environmental Technology

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The adsorption of toluene (TOL) as a target volatile organic compound has been studied experimentally and modelled on various hydrophobic zeolites: Faujasite (FAU), ZSM-5 (Z) and Mordenite (MOR). The influence of the nature of the compensating cation (H+ or Na+) has also been investigated for ZSM-5 zeolite, which is known to possess three kinds of adsorption sites (sinusoidal channels, straight channels and intersections). Type I isotherms observed on FAU, Na-Z and MOR fitted well with the Langmuir model. A deviation from a type I isotherm was observed for H-Z, because of the structure of this zeolite. The Successive Langmuir Model was more successful to fit the 'bump' of the experimental curve than the Double Langmuir. Classical shapes were found for MOR, FAU and Na-Z breakthrough curves that were fitted with good accuracy using the Linear Driving Force (LDF) approximation. In the case of H-Z, a change of profile was observed during the dynamic adsorption and the differences seen between the Na-Z and H-Z behaviours were explained by the strong interactions between Na+ and adsorbed TOL at the intersection sites. The Na+ cations prevented reorientation of TOL molecules at the intersection and thereby avoided the filling of the sinusoidal channel segments. Thus, a specific model was developed for fitting the breakthrough curve of H-Z. The model developed took into account these two types of adsorption sites with the overall uptake for each site being given by an LDF approximation.

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Effect of channel geometry, degree of activation, relative humidity and temperature on the performance of binderless activated carbon monoliths in the removal of dichloromethane from air

Cited by 33 publications

References 25 publications

Application of Fibrous Activated Carbon Filter in Continuous-Flow Unit for Removal of Volatile Organic Compounds under Simulated Indoor Conditions

Application of Fibrous Activated Carbon Filter in Continuous-Flow Unit for Removal of Volatile Organic Compounds under Simulated Indoor Conditions

A critical review on VOCs adsorption by different porous materials: Species, mechanisms and modification methods

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

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