Surface modification of adsorbents by dielectric barrier discharge

Kodama, Satoshi; Habaki, Hiroaki; Sekiguchi, Hidetoshi; Kawasaki, Junjiro

doi:10.1016/s0040-6090(02)00030-5

Cited by 61 publications

(30 citation statements)

References 10 publications

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“…The enhanced disappearance rate of selected organic compounds can be explained (i) by the generation of reactive oxidative species ( OH radical and hydrogen peroxide), who take part in the degradation of such compounds [10,11], (ii) by the modification of the sorbent surface [5,12], and (iii) by the electric polarization of the compounds [13,14].…”

Section: Discussionmentioning

confidence: 99%

“…Kodama [12] and Lee [6] both highlighted the role of oxygen in plasma, which creates oxygen radicals that react on the surface of activated carbon, resulting in the creation of weakly acidic functional groups. In our study, the acidification of the adsorbent material is justified by the presence of nitrites and nitrates on the activated carbon, resulting from the dissociation of nitric and nitrous acids.…”

Section: Discussionmentioning

confidence: 99%

“…The formation of ozone may be limited by lowering the applied potential or by increasing the affinity with the ACC. However, ozone can have a beneficial effect on activated carbon by enhancing the ozone transformation into ·OH radicals [21], and to create more acid sites on the surface [5,12]. The accumulation of nitrites and nitrates on the activated carbon by NO 2 production can limit its adsorptive capacity.…”

Section: Discussionmentioning

confidence: 99%

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Enhanced Adsorption of Organic Compounds over an Activated Carbon Cloth by an External-Applied Electric Field

2017

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Adsorption of pollutants on activated carbon is an effective air pollution control technique. In this study, a strong and non-uniform electric field was applied over an activated carbon fiber cloth. The adsorption kinetic of several organic compounds (Acetone, Acetaldehyde, Benzene, Cyclohexane, Ethanol, Methyl Ethyl Ketone, Toluene, 1-Propanol) on the activated carbon cloth was evaluated in the presence and in the absence of an electric field. Results suggest that its application enhances the adsorptive process. A linear correlation was found between such enhancement and the specific heat of liquefaction of the organic compounds.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Enhanced Adsorption of Organic Compounds over an Activated Carbon Cloth by an External-Applied Electric Field

2017

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“…Both specific and nonspecific interactions are important (Arenillas et al 2005;Guo et al 2006;Maroto-Valer et al 2005). As a truth of nonspecific adsorption, molecules of sizes less than 1 nm, especially from a gas phase, can be effectively adsorbed on microporous activated carbon (AC) (Arenillas et al 2005;Drage et al 2007;El-Sayed and Bandosz 2001;Gomes et al 2008;Guo and Lua 2002;Kodama et al 2002;Maroto-Valer et al 2005;Plaza et al 2007;Tamai et al 2006). On the other hand, nitrogen functional groups in the structure of AC affect CO 2 adsorption positively (Arenillas et al 2005;Drage et al 2007;Maroto-Valer et al 2005;Pevida et al 2008;Shafeeyan et al 2010).…”

mentioning

confidence: 99%

Carbon Dioxide Capture with Amine-Grafted Activated Carbon

Houshmand

Daud

Lee

et al. 2011

Water Air Soil Pollut

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There are several possible methods by which amine groups can be grafted on the surface of activated carbon (AC) to improve their capacity for CO 2 adsorption. Ethylenediamine and diethylenetriamine were selected as amino compounds for anchoring on the surface of an oxidized AC. Oxidation of AC was carried out by concentrated nitric acid. For each amino compound, two "in-solvent" and "solventfree" methods with a number of grafting times were studied. Nitrogen adsorption-desorption at 77 K and proximate and ultimate analysis were used to determine physical and chemical characteristics of the samples. Temperature-programmed (TP) CO 2 adsorption test from 30°C to 120°C were performed to investigate the effect of modification on CO 2 capture. The modification clearly had a negative effect on the textural characteristics of the samples, so the samples showed a less CO 2 uptake at lower temperatures. However, the decrease of capture capacity with increasing temperature is to somewhat softer for amine-grafted samples, so that they have a capacity comparable to the parent sample or even more than that at elevated temperatures. This property may give the new adsorbents this opportunity to be used at flue gas temperature with a higher efficiency. CO 2 capture capacity per unit surface area of all the amine-modified samples, however, was significantly improved, compared to the parent sample presenting a great influence of amino groups on the CO 2 capture capacity. Moreover, the used amine compounds and grafting methods were compared in terms of adsorbent characteristics and CO 2 uptake curves. Cyclic adsorption-desorption tests showed a satisfactory regeneration for the modified samples.

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“…Kodama et al . [4] applied DBD plasma to improve adsorbability of granular-activated carbon (GAC) and found that DBD plasma could enhance the adsorption amount of GAC to metal ions. Lee et al .…”

Section: Introductionmentioning

confidence: 99%

DBD regeneration of GAC loaded with acid orange 7

et al. 2009

Asia-Pacific J Chem Eng

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Activated carbon (AC) has been widely used as adsorbent in various industrial applications, such as purification of water in sewage facilities and filtration of air in toxicity-treating factories. However, after exhaustion, AC should be regenerated and reused because of the limited resources for AC production and additional secondary pollution of spent-carbon dumped into water or soil. In this study, a process for regenerating AC based on high active species (O 3 , ·OH, HO 2 , O 2 , ·RO, etc.) generated by dielectric barrier discharge (DBD) oxidation was proposed. The regeneration of granular-activated carbon (GAC) exhausted with azo dye acid orange 7 was investigated to assay this method. The influences of the parameters, such as treatment time, electric field and gas kind, on the readsorption rate were studied systematically. The results of structural properties of GAC analyses showed that the surface area, the micropore area, external surface area, micropore volume and total volume of GAC after three cycles DBD treatment decreased to different extent. The adsorption isotherms indicated that the regeneration efficiency was about 81% after three times DBD plasma regeneration cycles, which confirmed the reuse feasibility of the regenerated GAC.  2009

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Surface modification of adsorbents by dielectric barrier discharge

Cited by 61 publications

References 10 publications

Enhanced Adsorption of Organic Compounds over an Activated Carbon Cloth by an External-Applied Electric Field

Enhanced Adsorption of Organic Compounds over an Activated Carbon Cloth by an External-Applied Electric Field

Carbon Dioxide Capture with Amine-Grafted Activated Carbon

DBD regeneration of GAC loaded with acid orange 7

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