Porous properties of activated carbons from waste newspaper prepared by chemical and physical activation

Okada, Kiyoshi; Yamamoto, Nobuo; Kameshima, Yoshikazu; Yasumori, Atsuo

doi:10.1016/s0021-9797(03)00107-3

Cited by 161 publications

(85 citation statements)

References 23 publications

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“…Meanwhile, in the case of 850-180, 850-220, and 880-140, they exhibited high SBET and large Vt values, even though their burn-off values were consistent with those of 910-100 and 950-60. When activated at 850 to 880 °C, the gasification of the carbon matrix and the diffusion of the activator to the inside of the carbon matrix proceed at a suitable rate, making the extent of the activation process more uniform, while activations at temperatures that are too high (910 to 950 °C) lead to a sintering effect, which causes a recession in the pore structure development (Okada et al 2003).…”

Section: Resultsmentioning

confidence: 99%

Porosity Evolution of Activated Carbon Fiber Prepared from Liquefied Wood. Part II: Water Steam Activation from 850 to 950 °C

Jin¹,

Zhao²

2014

BioResources

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To acquire activated carbon fiber from phenol-liquefied wood (PLWACF) with better developed pore structure and a high proportion of mesoporosity, the porosity evolution of PLWACF activated at temperatures from 850 to 950 °C by water steam was detected by the physical adsorption of N2 at -196 °C. Results showed that the pore structure was well developed by prolonging the activation time at 850 to 910 °C, and it was easy to obtain PLWACF having exceptionally high surface area (larger than 2560 m 2 g -1 ). However, PLWACF with a specific surface area larger than 3000 m 2 g -1 could only be obtained in the late activation stages from 850 to 880 °C. Using this activation process, the mesoporosity was remarkably developed. The mesopore proportion drastically increased with an increase in activation temperature or time, reaching a maximum of 49.5%. The pore size distribution widened as the activation time increased and appeared to accelerate with the use of a higher activation temperature. The mesopore size distribution was enlarged from 2.8 to 5.8 nm.

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Section: Resultsmentioning

confidence: 99%

Porosity Evolution of Activated Carbon Fiber Prepared from Liquefied Wood. Part II: Water Steam Activation from 850 to 950 °C

Jin¹,

Zhao²

2014

BioResources

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“…It can be seen that the carbon prepared in this work has a relatively high monolayer adsorption capacity compared to many other activated carbons . The high adsorption capacity of JAS-MAC is likely due to the higher mesoporosity and mesopore volume optimized by the statistic experimental design [20]. The plot Q m against mesoporous volume (data collected from Table 4, except for the data provided by Reference [19]) shows a positive correlation with R 2 = 0.71 ((P > F) = 0.011).…”

Section: Comparison With Other Activated Carbonsmentioning

confidence: 93%

“…S5(b)). This was maybe resulted from over-activation, which increases surface area rather than pore formation [6,20]. Figure S6(b) shows that the total yield gradually reduced as activation time increased whatever the dosage of ZnCl 2 .…”

Section: Factors Influenced On Mesoporosity Mesopore Volume and Yieldsmentioning

confidence: 99%

Fabrication, characterization and evaluation of mesoporous activated carbons from agricultural waste: Jerusalem artichoke stalk as an example

Luo

2014

Front. Environ. Sci. Eng.

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This work explores the feasibility of Jerusalem artichoke stem (JAS), an agricultural waste, as an alternative precursor for fabrication of mesoporous activated carbon (MAC) via conventional ZnCl 2 activation. The as-prepared JAS-MACs were characterized by thermogravimetric, nitrogen gas adsorption isotherm and high resolution scanning electron microscopy analysis. The interacting effects of chemical dosage, activation temperature and time on the mesoporosity, mesopore volume and carbon yield were investigated, and further optimized by response surface methodology (RSM). The Brunauer-Emmett-Teller surface area, mesoporosity and mesopore volume of the JAS-MAC prepared under optimum condition were identified to be 1631 m 2 $g -1 , 90.16% and 1.11 cm 3 $g -1 , respectively. Compared with commercial activated carbons, this carbon exhibited a comparable monolayer adsorption capacity of 374.5 mg $g -1 for Methylene Blue dye. The findings suggest that RSM could be an effective approach for optimizing the pore structure of fabricated activated carbons.

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“…Physical activation consists of (i) thermal treatment of the precursor in an inert atmosphere and the successively controlled gasification of the carbonaceous material or (ii), the direct activation of the raw material in the presence of the activating gas. The main characteristics of physical activation are: higher temperatures than chemical activation (between 800-1100 °C), a more heterogeneous micropore size and very simple method (Okada et al, 2003). The effect of the type of precursor on the porosity of final materials is well known in the case of chemical activation, whereas in physical activation processes, further studies are needed to determine the relevance of this variable.…”

Section: Thermal Treatments Of Organic Gelsmentioning

confidence: 99%

Designing Nanostructured Carbon Xerogels

Calvo¹,

Menéndez²,

Arenillas³

2011

Nanomaterials

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Porous properties of activated carbons from waste newspaper prepared by chemical and physical activation

Cited by 161 publications

References 23 publications

Porosity Evolution of Activated Carbon Fiber Prepared from Liquefied Wood. Part II: Water Steam Activation from 850 to 950 °C

Porosity Evolution of Activated Carbon Fiber Prepared from Liquefied Wood. Part II: Water Steam Activation from 850 to 950 °C

Fabrication, characterization and evaluation of mesoporous activated carbons from agricultural waste: Jerusalem artichoke stalk as an example

Designing Nanostructured Carbon Xerogels

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