Competitive adsorption equilibrium modeling of volatile organic compound (VOC) and water vapor onto activated carbon

Laskar, Imranul I; Hashisho, Zaher; Phillips, John H.; Anderson, James E.; Nichols, Mark

doi:10.1016/j.seppur.2018.11.073

Cited by 58 publications

(17 citation statements)

References 26 publications

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“…Many of them are very toxic, being lethal to humans and animals. Therefore, it is highly necessary to reduce these effect in order to get clean air for a safer, smarter, and greener lifestyle [112,[236][237][238][239]. Several filtration systems have been proposed but AC is widely used to adsorb those compounds from the air.…”

Section: Air Cleaningmentioning

confidence: 99%

The Potentiality of Rice Husk-Derived Activated Carbon: From Synthesis to Application

et al. 2020

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Activated carbon (AC) has been extensively utilized as an adsorbent over the past few decades. AC has widespread applications, including the removal of different contaminants from water and wastewater, and it is also being used in capacitors, battery electrodes, catalytic supports, and gas storage materials because of its specific characteristics e.g., high surface area with electrical properties. The production of AC from naturally occurring precursors (e.g., coal, biomass, coconut shell, sugarcane bagasse, and so on) is highly interesting in terms of the material applications in chemistry; however, recently much focus has been placed on the use of agricultural wastes (e.g., rice husk) to produce AC. Rice husk (RH) is an abundant as well as cheap material which can be converted into AC for various applications. Various pollutants such as textile dyes, organic contaminants, inorganic anions, pesticides, and heavy metals can be effectively removed by RH-derived AC. In addition, RH-derived AC has been applied in supercapacitors, electrodes for Li-ion batteries, catalytic support, and energy storage, among other uses. Cost-effective synthesis of AC can be an alternative for AC production. Therefore, this review mainly covers different synthetic routes and applications of AC produced from RH precursors. Different environmental, catalytic, and energy applications have been pinpointed. Furthermore, AC regeneration, desorption, and relevant environmental concerns have also been covered. Future scopes for further research and development activities are also discussed. Overall, it was found that RH-derived AC has great potential for different applications which can be further explored at real scales, i.e., for industrial applications in the future.

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Section: Air Cleaningmentioning

confidence: 99%

The Potentiality of Rice Husk-Derived Activated Carbon: From Synthesis to Application

et al. 2020

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“…At 0.5 min, before any peak of the BDO molecular appears, water is observed to emerge on the surface of the catalyst . A possible reason for this is that water vapor is typically present in alcohol, which competes with alcohol for adsorption onto the catalysts owing to its higher affinity to the acidic sites than the diol . At 2 min, the intensity of the O−H stretching vibrations of the adsorbed water increases while the bands of the CH 2 group at 1200–1430 cm −1 appear .…”

Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of 1,4‐Butanediol over Mg−Yb Binary Oxides and the Mechanism Study

et al. 2020

ChemCatChem

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In this study, MgÀ Yb binary oxides were synthesized using different MgO concentrations and investigated for the catalytic dehydration of 1,4-butanediol (BDO) into 3-buten-1-ol (BTO). The physicochemical properties of the catalysts were characterized by N 2 physisorption, X-ray diffraction, Raman spectroscopy, temperature-programmed techniques, and diffuse reflectance infrared Fourier transform spectroscopy. The MgÀ Yb binary oxides exhibited superior catalytic activity and better BTO selectivity compared with the pristine Yb 2 O 3 or MgO. Structures of MgÀ OÀ Yb were generated in the binary oxides via the interchange of Yb or Mg in the MgO or Yb 2 O 3 crystalline phases. Extra basic and acidic sites were formed over the MgÀ Yb binary oxides because of the formation of surface defects and the presence of MgÀ OÀ Yb structures, respectively. The acidic as well as basic sites were observed to influence the catalytic performance: BDO reactivity was enhanced by the more acidic sites, while BTO selectivity was favored by the basic sites. The highest BTO yield of 71.1 % was achieved over the Mg7Yb3 catalyst with 90.4 % BDO conversion and 78.6 % BTO selectivity at 350°C. The in situ DRIFTS results indicated that BDO was first adsorbed on the catalyst and then reacted with the acidic sites to generate butoxides. The β-H of the surface butoxides was abstracted by the basic oxygen anions to produce aldehyde species, which dissociated to form BTO.[a] R.

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“…Details on the equilibria formulation and the extended Manes method are provided elsewhere. 26 Adsorbed-Phase Mass Balance. The diffusive adsorbate transport in the adsorbed phase is characterized using the LDF model as mentioned above, and is given as 42,45…”

Section: S K C C (mentioning

confidence: 99%

Modeling the Effect of Relative Humidity on Adsorption Dynamics of Volatile Organic Compound onto Activated Carbon

Laskar

Hashisho

Phillips

et al. 2019

Environ. Sci. Technol.

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A two-dimensional heterogeneous mathematical model was developed and validated to study the effect of relative humidity on volatile organic compound (VOC) adsorption onto activated carbon. The dynamic adsorption model consists of the macroscopic mass, momentum, and energy conservation equations and includes a multicomponent adsorption isotherm to predict the competitive adsorption equilibria between VOC and water vapor, which is described by an extended Manes method. Experimental verifications show that the model predicted the breakthrough profiles during competitive adsorption of the studied VOCs (2-propanol, acetone, n-butanol, toluene, 1,2,4-trimethylbenzene) at relative humidity range 0− 95% with an overall mean relative absolute error (MRAE) of 11.8% for dry (0% RH) conditions and 17.2% for humid (55 and 95% RH) conditions, and normalized root-mean-square error (NRMSE) of 5.5 and 8.4% for dry and humid conditions, respectively. Sensitivity analysis was also conducted to test the robustness of the model in accounting for the impact of relative humidity on VOC adsorption by varying the adsorption temperature. Good agreement was observed between the experimental and simulated results with an overall MRAE of 12.4 and 7.1% for the breakthrough profiles and adsorption capacity, respectively. The model can be used to quantify the impact of carrier gas relative humidity during adsorption of contaminants from gas streams, which is useful when optimizing adsorber design and operating conditions.

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Competitive adsorption equilibrium modeling of volatile organic compound (VOC) and water vapor onto activated carbon

Cited by 58 publications

References 26 publications

The Potentiality of Rice Husk-Derived Activated Carbon: From Synthesis to Application

The Potentiality of Rice Husk-Derived Activated Carbon: From Synthesis to Application

Catalytic Dehydration of 1,4‐Butanediol over Mg−Yb Binary Oxides and the Mechanism Study

Modeling the Effect of Relative Humidity on Adsorption Dynamics of Volatile Organic Compound onto Activated Carbon

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