Breakthrough of toluene vapours in granular activated carbon filled packed bed reactor

Mohan, N.; Kannan, Govind; Upendra, S.; Subha, R.; Kumar, Narender

doi:10.1016/j.jhazmat.2009.02.079

Cited by 97 publications

(36 citation statements)

References 19 publications

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“…Both of them explain that small contact area and short contact time can result in low RE at low concentration. On the other hand, adsorption is a process that molecules accumulate on the free surface area of an adsorbent, which caused by the saturation of free bonding forces (Mohan et al, 2009 Porous adsorbents are used and the adsorption capacity is mainly determined by pore volume and surface area (Zhou et al, 2014). For a given amount of graphite, the pore volume and surface area are determinate.…”

Section: The Effect Of Initial Concentration On the Removal Of Pcdd/fsmentioning

confidence: 99%

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Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Lin

et al. 2016

Aerosol Air Qual. Res.

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The adsorption of the 17 toxic 2,3,7,8-substituted dioxin congeners onto graphite was investigated using a laboratoryscale fixed-bed adsorption system. First, the morphology and microstructure of graphite were characterized by Scanning Electron Microscopy and Brunauer-Emmer-Teller surface estimation. Removal efficiency of the 17 toxic PCDD/Fs varies from 89.31% to 99.96% and the amount adsorbed on graphite is a linear function of the inlet concentration of PCDD/Fs, as it was varied from 2.3-20.7 ng I-TEQ Nm -3 . Operating over 3 hours, it is observed that the saturation time of fixed-bed adsorbers is less when the inlet concentration is higher. The removal efficiency of dioxin depends on vapour pressure and rises strongly with increasing chlorine substitution number. Removal efficiencies strongly correlate with vapour pressure, with R 2 0.96 for PCDDs and 0.99 for PCDFs, respectively. The removal efficiency of dioxin decreases linearly as the temperature increased (R 2 = 0.99). Possibly, π-π interactions between PCDD/Fs and graphite sheets lead to a high adsorption capacity of dioxin. The high mesopores volume and pore structure of graphite are critical factors when adsorbing dioxin.

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Section: The Effect Of Initial Concentration On the Removal Of Pcdd/fsmentioning

confidence: 99%

“…It is seemed that these different trends result from concentration. In fact, the saturation is the main reason (Mohan et al, 2009;Zhou et al, 2015a). It is well known that adsorption and desorption occur simultaneously during adsorption period.…”

Section: The Effect Of Adsorption Time On the Removal Of Pcdd/fsmentioning

confidence: 99%

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Lin

et al. 2016

Aerosol Air Qual. Res.

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“…Industrial activities cause many environmental problems and destruction of several ecosystems due to accumulation of dangerous pollutants such as volatile organic compounds (VOCs), which are the most common pollutants emitted by the different industries. VOCs are normally present in gas or liquid streams and are very harmful for human health, crops, vegetation, and the environment, even at very low concentrations (Mohan et al, 2009). Therefore, there is a pressing need to develop new environment-friendly technologies and new materials for VOCs removal (Andriantsiferana et al, 2013;Essawy et al, 2014;Andriantsiferana et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Production of sugarcane bagasse-based activated carbon for formaldehyde gas removal from potted plants exposure chamber

Mohamed

El‐Hashemy

Abdel‐Latif

et al. 2015

Journal of the Air & Waste Management Association

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Agricultural wastes such as rice straw, sugar beet, and sugarcane bagasse have become a critical environmental issue due to growing agriculture demand. This study aimed to investigate the valorization possibility of sugarcane bagasse waste for activated carbon preparation. It also aimed to fully characterize the prepared activated carbon (BET surface area) via scanning electron microscope (SEM) and in terms of surface functional groups to give a basic understanding of its structure and to study the adsorption capacity of the sugarcane bagasse-based activated carbon using aqueous methylene blue (MB). The second main objective was to evaluate the performance of sugarcane bagasse-based activated carbon for indoor volatile organic compounds removal using the formaldehyde gas (HCHO) as reference model in two potted plants chambers. The first chamber was labeled the polluted chamber (containing formaldehyde gas without activated carbon) and the second was taken as the treated chamber (containing formaldehyde gas with activated carbon). The results indicated that the sugarcane bagasse-based activated carbon has a moderate BET surface area (557 m 2 /g) with total mesoporous volume and microporous volume of 0.310 and 0.273 cm 3 /g, respectively. The prepared activated carbon had remarkable adsorption capacity for MB. Formaldehyde removal rate was then found to be more than 67% in the treated chamber with the sugarcane bagasse-based activated carbon. The plants' responses for this application as dry weight, chlorophyll contents, and protein concentration were also investigated.Implications: Preparation of activated carbon from sugarcane bagasse (SCBAC) is a promising approach to produce cheap and efficient adsorbent for gas pollutants removal. It may be also a solution for the agricultural wastes problems in big cities, particularly in Egypt. MB adsorption tests suggest that the SCBAC have high adsorption capacity. Formaldehyde gas removal in the plant chambers indicates that the SCBAC have potential to recover volatile gases. The results confirmed that the activated carbon produced from sugarcane bagasse waste raw materials can be used as an applicable adsorbent for treating a variety of gas pollutants from the indoor environment.

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“…Adsorption technologies for controlling VOC emissions have been recognized as preferred strategies, especially in cases where the captured organic pollutants have alternative uses [3]. Among various adsorbents, activated carbon is the most widely used for VOC adsorption due to its low cost and well-developed microporosity which ensures excellent adsorption capacity [4]. However, serious diffusion restrictions imposed by micropores in activated carbon tend to inhibit its ability to adsorb large VOC molecules.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and desorption performance of benzene over hierarchically structured carbon–silica aerogel composites

Dou

Wang

et al. 2011

Journal of Hazardous Materials

103

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a b s t r a c tHierarchically structured carbon-silica aerogel (CSA) composites were synthesized from cheap water glass precursors and granulated activated carbon via a post-synthesis surface modification with trimethylchlorosilane (TMCS) and a low-cost ambient pressure drying procedure. The resultant CSA composites possess micro/mesoporous structure and hydrophobic surface. The adsorption and desorption performance of benzene on carbon-silica aerogel composite (CSA-2) under static and dynamic conditions were investigated, comparing with pure silica aerogel (CSA-0) and microporous activated carbon (AC). It was found that CSA-2 has high affinity towards aromatic molecules and fast adsorption kinetics. Excellent performance of dynamic adsorption and desorption observed on CSA-2 is related to its higher adsorption capacity than CSA-0 and less mass transfer resistance than AC, arising from the well-developed microporosity and open foam mesostructure in the CSA composites.

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Breakthrough of toluene vapours in granular activated carbon filled packed bed reactor

Cited by 97 publications

References 19 publications

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Production of sugarcane bagasse-based activated carbon for formaldehyde gas removal from potted plants exposure chamber

Adsorption and desorption performance of benzene over hierarchically structured carbon–silica aerogel composites

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