Effects of activation method on the pore structure of activated carbons from apricot stones

Gergova, K.; Eser, Semih

doi:10.1016/0008-6223(96)00028-0

Cited by 136 publications

(70 citation statements)

References 17 publications

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“…In this study, activated carbons were prepared from apricot stones by using the one-step steam activation method. The onestep activation method with steam has advantages over the two-step method, due to its simplicity and efficiency in the preparation of activated carbons from lignocellulosic materials [11] and anthracite [12]. The one-step method eliminates the separate carbonization step that is used in the conventional two-step method and employs lower temperatures in the preparation of the activated carbons.…”

Section: Introductionmentioning

confidence: 99%

“…Although, in the literature there are a number of studies on the physical and chemical characterization of apricot stones [1,[9][10][11] as activated carbons, there is no research on the stones and their carbons due to their raw material preparation. The abundant production of apricot stones in Malatya/Turkey, make these stones versatile lignocellulosic activated carbon precursors for Turkey, however, the number of techniques used in the preparation of the precursors lead to a different approach in the scientific investigation of their properties as activated carbons.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of activated carbons by one-step steam pyrolysis/activation from apricot stones

Şentorun-Shalaby

Uçak-Astarlıogˇlu

Artok

et al. 2006

Microporous and Mesoporous Materials

177

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The activated carbons were prepared from Malatya (a city located in the south-east of Turkey) apricot stones by one-step steam pyrolysis/activation process and characterized for their pore structures. Three kinds of apricot stones that differ in their sulfur content, because of the different drying processes, were chosen for this study to investigate the effect of sulfur in the activated carbon production. The effect of process variables, such as activation temperature, soak time, and particle size range was studied on these samples. The activation temperature and time tested were in the ranges of 650-850°C for 1-4 h. The activated carbons were evaluated for their chemical (elemental composition), surface (BET surface area, mercury porosimetry), and adsorption (iodine number) properties. Carbonization behavior of the apricot stones was investigated by thermogravimetric analysis. Scanning electron microscopy (SEM) was used to follow the changes in the carbon texture upon activation.The experimental results revealed that carbons obtained by the same conditions of activation show differences in their pore structures and adsorption characteristics due to their sulfur contents. The highest BET surface area carbon (1092 m 2 /g) was obtained from the low sulfur content (0.04%) apricot stone with a particle size range of 1-3.35 mm at the activation conditions of 800°C for 4 h. The experimental results showed that commercial production of porous activated carbons from Malatya apricot stones is feasible in Turkey.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of activated carbons by one-step steam pyrolysis/activation from apricot stones

Şentorun-Shalaby

Uçak-Astarlıogˇlu

Artok

et al. 2006

Microporous and Mesoporous Materials

177

View full text Add to dashboard Cite

show abstract

“…Nesse sentido, devido à grande diversidade e quantidade de materiais lignocelulósicos produzidos (HAMEED & RAHMAN, 2008), intensificam-se os estudos para a produção de carvão ativado de diversas origens, já que as características dos resíduos vegetais são de alta qualidade e adsorvem uma diversidade de gases e líquidos poluentes (GERGOVA & ESER, 1996).…”

Section: Introductionunclassified

Estudo Da Capacidade De Adsorção De Corantes Orgânicos Sobre Carvões Ativados Com Ácido Fosfórico Obtidos a Partir Do Caroço De Jaca (Artocarpus Heterophyllus)

Borges¹,

Alves²,

Brito³

et al. 2015

Anais Do XXXVII Congresso Brasileiro De Sistemas Particulados

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RESUMOCarvões ativados são materiais carbonosos com porosidade elevada, o que os tornam capazes de adsorver moléculas em fase gasosa e/ou líquida, e que pode ser produzido por diversos materiais como os resíduos de biomassa produzidos pelas industriais de alimentos. Portanto o presente estudo trata da produção de carvão ativado (CA) com a proposta de estudar a capacidade de adsorção de corantes orgânicos em solução aquosa sobre CA preparado a partir do caroço da jaca, avaliando o potencial de utilização deste resíduo como novo material precursor. Foram preparados carvões pelo método de ativação química, usando o agente químico ácido fosfórico (H 3 PO 4 ) na razão de impregnação (Ri) de 1:1 (CA1) e 1:2 (CA2) (Ri= massa do caroço de jaca/ massa do ativante em solução). Após a obtenção as amostras de CA foram caracterizadas quanto ao teor de umidade, cinzas e pH e os resultados obtidos na razão de 1:1 e 1:2 foram 2,00% e 2,65% de umidade, 2,33% e 1,91% de cinzas e 2,58 e 3,35 de pH respectivamente. Depois da caracterização foram feitos os estudos do pH ótimo de adsorção, o estudo de massa dos carvões sobre a adsorção do azul de metileno (AM) a 50 mg L 1 e a cinética, a partir disso verificou-se uma maior capacidade de adsorção usando-se massas a partir de 0,04g em solução de azul de metileno com pH8. Nos experimentos cinéticos que foram realizados para verificar o tempo necessário para se atingir o equilíbrio de adsorção, observou-se uma capacidade de remoção de até 99,9% de AM.

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“…For the former, the route involves carbonization of carbonaceous starting materials derived from natural materials, such as coal [25] and low-cost agricultural by-products [26][27][28][29][30][31] in an inert atmosphere (such as N 2 or Ar) and activation of the resulting char by CO 2 or H 2 O at high temperatures (600-1100 • C) [27] [32,33]. For the latter, carbonization and activation are carried out in the presence of CO 2 or H 2 O without an additional inert gas [34]. The one-step procedure was proposed to be more economically viable than the two-step procedure due to its lower activation temperature (500-900 • C).…”

Section: Introductionmentioning

confidence: 99%

Physical activation of diatomite-templated carbons and its effect on the adsorption of methylene blue (MB)

Liu

Yuan

et al. 2013

Applied Surface Science

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Effects of activation method on the pore structure of activated carbons from apricot stones

Cited by 136 publications

References 17 publications

Preparation and characterization of activated carbons by one-step steam pyrolysis/activation from apricot stones

Preparation and characterization of activated carbons by one-step steam pyrolysis/activation from apricot stones

Estudo Da Capacidade De Adsorção De Corantes Orgânicos Sobre Carvões Ativados Com Ácido Fosfórico Obtidos a Partir Do Caroço De Jaca (Artocarpus Heterophyllus)

Physical activation of diatomite-templated carbons and its effect on the adsorption of methylene blue (MB)

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