Adsorption characteristics of activated carbons obtained from corncobs

El-Hendawy, Abdel-Nasser A.; Samra, S.E.; Girgis, Badie S.

doi:10.1016/s0927-7757(00)00682-8

Cited by 254 publications

(119 citation statements)

References 34 publications

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“…14 the results of S BET versus burn-off are compared with the reported by other authors from physical activation of other agricultural by-products like apricot stones [24], cherry stones [24], olive stones [1], pecan shells [26], coconut shells [21] and other biomass residues, activated with steam [1,24,[27][28][29][30][31] and CO 2 [1,21,[31][32][33][34][35][36]. It can be observed that the surface area values obtained by oxygen chemisorption-desorption of grape seeds covers the usual range of porosity for activated biomass materials, and that such porosity development can be achieved at burn-off values below the average results.…”

Section: Comparison With Results In Literaturementioning

confidence: 96%

Development of porosity upon physical activation of grape seeds char by gas phase oxygen chemisorption–desorption cycles

Jiménez-Cordero

Heras

Alonso-Morales

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t sNovel method of activation by cycles permits good control of porosity development. S BET values above 1000 m 2 /g can be obtained with burn-off values lower than 40%. The low burn-off helps to maintain granular morphology of the activated carbons.Carbons with unique hollow core structure and wall thickness of 250 lm are produced.The activated carbons showed a good mechanical strength during attrition test. a r t i c l e i n f o t r a c tActivation of grape seeds char upon cyclic oxygen chemisorption-desorption permits a controlled development of porosity versus burn-off using air as a cheap activation agent. In this work the influence of chemisorption and desorption temperature and the number of cycles is investigated. A fast increase of BET surface area (S BET ) is obtained in the two first cycles; that increase becomes then lower although the S BET continues increasing upon the successive cycles. Regarding the Dubinin-Astakhov surface area (S DA ) a slow increase was observed from cycle to cycle. The activation process led to the development of both micro and mesoporosity. Under the optimum conditions for surface area development, i.e. an oxidation temperature of 275°C and desorption temperatures between 850 and 950°C, values of 1129-1256 and 1339-1219 m 2 /g were obtained for S BET and S DA , respectively. Porosity was found to increase mainly during the desorption stage, although chemisorption also led to some surface area development. SEM characterization showed that the activated carbon maintained the granular morphology of the seeds even after 10 cycles showing the egg-shell structure of the precursor with longer and deeper cracks at the outer surface. The activated carbons showed a good mechanical strength during attrition tests.

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Section: Comparison With Results In Literaturementioning

confidence: 96%

Development of porosity upon physical activation of grape seeds char by gas phase oxygen chemisorption–desorption cycles

Jiménez-Cordero

Heras

Alonso-Morales

et al. 2013

Chemical Engineering Journal

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“…Physical activation is a widely used two-step process to activate carbon precursors, which involves pyrolysis carbonization process of raw materials (below 1000 K) followed by a controlled gasification process at relatively higher temperatures ( > 1150 K) in the presence of oxidizing gases such as carbon dioxide, steam, air or their mixtures [50].…”

Section: Physical Activationmentioning

confidence: 99%

Biomass-derived renewable carbon materials for electrochemical energy storage

Gao

Zhang

Song

et al. 2016

Materials Research Letters

447

181

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Electrochemical energy storage devices, such as supercapacitors and batteries, have been proven to be the most effective energy conversion and storage technologies for practical application. However, further development of these energy storage devices is hindered by their poor electrode performance. Carbon materials used in supercapacitors and batteries are often derived from nonrenewable resources under harsh environments. Naturally abundant biomass is a green, alternative carbon source with many desired properties. This review article presents state of the art of renewable carbon materials derived from natural biomasses with an emphasis on their applications in supercapacitors and lithium-sulfur batteries. IMPACT STATEMENTThis review paper provides a comprehensive understanding for obtaining renewable carbons from natural biomass precursors via various activation methods for electrochemical energy storage application, especially for supercapacitor and lithium sulfur battery. ARTICLE HISTORY

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“…Similar hysteresis loops were obtained by other researchers. [7,12] Surface area and pore volume Impregnation ratio (IR) was found to be the most important parameter in the carbonization of carbon precursor using chemical activation. The influence of IR on some of the physical properties of activated carbons including BET surface area (S BET ), micropore surface area (S micro ), total pore volume (V T ), micropore volume (V micro ) and average pore diameter (D p ) are given in Table 1.…”

Section: N 2 Adsorption-desorption Isothermsmentioning

confidence: 99%

Surface properties of activated carbon prepared from wastes

Demiral

2008

Surface & Interface Analysis

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Adsorption characteristics of activated carbons obtained from corncobs

Cited by 254 publications

References 34 publications

Development of porosity upon physical activation of grape seeds char by gas phase oxygen chemisorption–desorption cycles

Development of porosity upon physical activation of grape seeds char by gas phase oxygen chemisorption–desorption cycles

Biomass-derived renewable carbon materials for electrochemical energy storage

Surface properties of activated carbon prepared from wastes

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