Adsorption of volatile organic compounds by means of activated carbon fibre-based monoliths

Fuertes, Antonio B.; Marbán, Gregorio; Nevskaia, D.M.

doi:10.1016/s0008-6223(02)00274-9

Cited by 117 publications

(78 citation statements)

References 13 publications

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“…The adsorption capacity for these compounds also showed the same ascending trend under the same RH conditions ( Table 1), suggesting that it depends on chemical type. This suggestion is supported by Fuertes et al (2003), who reported that the adsorption capacity showed a strong dependence on the nature of the adsorbate. For example, the adsorption capacity for benzene was 29 mg/g under 20% RH, whereas it was 183 mg/g for xylene.…”

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

confidence: 55%

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: 55%

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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“…In addition, the ACF maintained a stable BDO concentration without a rapid increase. The ACF exhibited a relatively higher specific surface area, adsorptivity, and desorptivity and a lower pressure drop compared with granular carbon (Huang et al, 2003;Fuertes, et al, 2003). Moreover, ACF can reduce fire hazards caused by heat accumulation on AC beds.…”

Section: Resultsmentioning

confidence: 99%

“…Numerous studies on the adsorption of VOCs with activated carbon (AC) have been conducted (Sun et al, 2012;Gnesdilov et al, 2007;Lou et al, 2006;Bansal and Goyal, 2005;Khan and Ghoshal, 2000;Popescu et al, 2001;Ruthven and Wiley, 1984), and most of the studies have applied fixed-bed adsorption systems Kim et al, 2002). In addition, studies on recovering VOCs by using ACF have been reported (Liu et al, 2012;Huang et al, 2003;Lordgooei et al, 1998;Fuertes et al, 2003). The specific surface area of ACFs ranges from 700 m 2 /g to 2400 m 2 /g, which provides larger surface areas compared with commonly used GAC (Lou et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Mass transfer of vapors to and from an ACF is enhanced because of its small nominal fiber diameter (10-12 μm). The physical properties of ACFs provide rapid adsorption and high adsorption capacities for a wide range of organic vapors (Huang et al, 2003;Lordgooei et al, 1998;Lo et al, 2002;Fuertes et al, 2003). In field application, steam is commonly applied as the heat source for regenerating AC (Shivaji et al, 2012;Duan et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Adsorption–desorption characteristics of methyl ethyl ketone with modified activated carbon and inhibition of 2,3-butanediol production

Nien

Chang²,

Chang

2015

Journal of the Air & Waste Management Association

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Activated carbon (AC) is seldom applied for recovering ketone-based volatile organic compounds because of safety concerns. Adsorption of methyl ethyl ketone (MEK) with AC is a highly exothermic reaction that potentially causes fires in AC beds. Moreover, 2,3-butanediol (BDO) is produced in the desorbed solvent, causing yellowing and odor of the recovered solvent. This study applied a continuous adsorption-desorption apparatus for evaluating the operating capacities and BDO concentration in recovered MEK containing modified and original ACs. AC-1 (TAKETA-G2X) was used as the target for modification. The experimental results indicate that using MgO as the modifier increases the ignition point by 12°C and that applying KNO 3 as the modifier reduces the AC ignition point by 28°C (compared with AC-1). The BDO concentration of the desorbed MEK solvent can be reduced by increasing the loading of the modifying agent (Ethanolamine) (Im-1: 3.1 wt%; Im-5: 6.2 wt%). Moreover, applying the AC pretreated with nitrogen (Im-6) as adsorbent significantly reduces the BDO concentration (from 0.123 wt% to 0.073 wt%). Because desorption and purging procedures were performed in N 2 atmospheres, the BDO concentrations of the desorbed MEK solvents were relatively low and ranged from 0.032 wt% to 0.043 wt%. When the MEK concentration was reduced to 2000 ppm, lower BDO concentrations (0.012-0.022 wt%) were measured in the recovered MEK solvent. The way to modify activated carbon and a better desorbing sequence to effectively inhibit the oxidation of MEK to BDO are developed. The results obtained indicate that the BDO concentration in the desorbed solvent was lower than the original MEK solvent (0.023 wt%). Different approaches can be applied simultaneously to achieve high inhibition effects; however, carbon adsorption performance may be negatively affected.Implications: The study is motivated to improve the quality of recovered solvent and reduce fire hazards, particularly when AC is applied for adsorbing a ketone-based solvent (e.g., MEK). The experimental results indicate that the BDO concentration in the recovered solvent can be reduced and the ignition point of AC can be increased by modifying the AC with an appropriate agent.

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“…Their severe reduction to lowest level needs sorbents with large surface area and pore volume. Zeolites [2], metal-organic framework (MOF) [4] and activated carbons [3,[6][7][8], are the most frequently utilized adsorbents, having great adsorption capacity for VOCs.…”

Section: Introductionmentioning

confidence: 99%

Determination by Modeling of the Interactions during the Adsorption Equilibrium of N-Propanol and Ortho Xylene on Activated Carbon Surface

Hachimi¹

2014

J Chem Eng Process Technol

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Temperature Programmed Adsorption Equilibrium (TPAE) procedure was used to determine the heats of adsorption of ortho xylene and 1-propanol on activated carbon at 300 K. The evolutions of the surface coverage with the adsorption temperature (θ e =f(T a )) were compared to the Temkin model in order to determine the heats of adsorption and reveal the affinity to the surface of activated carbon regarding the polarity of each adsorbate. It has been shown that the heats of adsorption of ortho xylene were E θ0 =100 kJ/mol and E θ1 =62 kJ/mol at 185 Pa, respectively, at low and high surface coverage. Whereas the heats of adsorption of 1-propanol at the adsorption equilibrium was found to be dependent to the surface coverage with E θ0 =67 kJ/mol and E θ1 =58 kJ/mol at 475 Pa. It was shown that ortho-xylene molecules have more affinity to the activated carbon surface than 1-propanol regarding the difference in the heats of adsorption.

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Adsorption of volatile organic compounds by means of activated carbon fibre-based monoliths

Cited by 117 publications

References 13 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

Adsorption–desorption characteristics of methyl ethyl ketone with modified activated carbon and inhibition of 2,3-butanediol production

Determination by Modeling of the Interactions during the Adsorption Equilibrium of N-Propanol and Ortho Xylene on Activated Carbon Surface

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