scholarly journals Physical Activation of Wooden Chips and the Effect of Particle Size, Initial Humidity, and Acetic Acid Extraction on the Properties of Activated Carbons

2018 ◽  
Vol 4 (4) ◽  
pp. 66 ◽  
Author(s):  
Davide Bergna ◽  
Henrik Romar ◽  
Ulla Lassi
Keyword(s):  
Particle Size ◽  
Acetic Acid ◽  
Pore Size ◽  
Activated Carbons ◽  
Lower Surface ◽  
Physical Activation ◽  
Acid Extraction ◽  
Size Distributions ◽  
Pore Size Distributions ◽  
Significant Difference

In this research study, two different wooden biomasses (birch and pine) were thermally carbonized and steam-activated into activated carbons in a one-stage process. The effects of particle size and humidity (as received and oven-dried) on the properties, such as specific surface areas, pore volumes, and pore size distributions, of the final activated carbon characteristics were examined. Another set of biomasses (birch, spruce, and pine) was pre-treated before carbonization and the activation steps through an extractive process using a weak acetic acid in Soxhlet extractors. According to the results, the dried samples had a slightly lower surface area, while no difference was observed in the yields. For the extracted samples, there was a significant difference, especially in the pore size distributions, compared to the non-extracted samples. There appeared to be a shift from a meso-microporous distribution to a microporous distribution caused by the extractive pre-treatment.

scholarly journals Broadening the pore size of coal-based activated carbonviaa washing-free chem-physical activation method for high-capacity dye adsorption

RSC Advances ◽  
2018 ◽  
Vol 8 (26) ◽  
pp. 14488-14499 ◽  
Author(s):  
Longxin Li ◽  
Fei Sun ◽  
Jihui Gao ◽  
Lijie Wang ◽  
Xinxin Pi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Pore Size Distribution ◽  
Pore Size ◽  
High Capacity ◽  
Dye Adsorption ◽  
High Rate ◽  
Physical Activation ◽  
Size Distributions ◽  
Pore Size Distributions ◽  
New Type

Aiming to overcome the limitations of the narrow pore size distributions of traditional activated carbon, we demonstrate a new type of activated carbon with a broadened pore size distribution for high-rate and high-capacity aqueous dye adsorption.

Calculation of Pore Size Distributions of Activated Carbons from Adsorption Isotherms

Langmuir ◽  
1999 ◽  
Vol 15 (23) ◽  
pp. 8235-8245 ◽  
Author(s):  
G. M. Davies ◽  
N. A. Seaton ◽  
V. S. Vassiliadis
Keyword(s):  
Pore Size ◽  
Adsorption Isotherms ◽  
Activated Carbons ◽  
Size Distributions ◽  
Pore Size Distributions

scholarly journals Comparison of the Properties of Activated Carbons Produced in a One-stage And a Two-Stage Process

2018 ◽  
Author(s):  
Davide Bergna ◽  
Toni Varila ◽  
Henrik Romar ◽  
Ulla Lassi
Keyword(s):  
Activated Carbons ◽  
Total Carbon ◽  
Physical Activation ◽  
Activation Process ◽  
Two Stage ◽  
Total Carbon Content ◽  
One Stage ◽  
Pore Size Distributions ◽  
Significant Difference ◽  
Stage Process

Activated carbons (ACs) can be produced from biomass in a thermal process either in a direct carbonization-activation process or first by carbonizing the biomass and later on activating the biochars into activated carbons. The properties of the ACs are dependent on the type of process used for production. In this study, the properties of activated carbons produced in a one-stage and a two-stage process are considered. Activated carbons were produced by physical activation of two types of starting materials, biochars produced from spruce and birch chips in a commercial carbonization plant and from the corresponding raw chips. The activated carbons produced were characterized regarding specific surfaces, pore volumes and pore size distributions. The unactivated biochars had some degree of surface area and some porosity. According to the results obtained, two slightly different types of activated carbons are produced depending if a one-stage or a two-stage carbonization and activation process is used. The ACs produced in the one-stage process had higher specific surface areas compared to the ones produced in a two-stage process. In addition, total pore volumes were higher in one-stage process but development of micropores is greater compared to two-stage process. There was no significant difference in total carbon content between one-stage and two-stage process.

scholarly journals Adsorption Energy and Pore-Size Distributions of Activated Carbons Calculated Using Hill's Model

2014 ◽  
Vol 32 (7) ◽  
pp. 571-590 ◽  
Author(s):  
Yosra Ben Torkia ◽  
Nadia Bouaziz ◽  
Shaheen A. Al-Muhtaseb ◽  
Abdelmottaleb Ben Lamine
Keyword(s):  
Pore Size ◽  
Adsorption Energy ◽  
Activated Carbons ◽  
Size Distributions ◽  
Pore Size Distributions

Relationship between pore size distributions and physical properties of clay soils

Soil Research ◽  
1974 ◽  
Vol 12 (2) ◽  
pp. 107 ◽  
Author(s):  
ID Sills ◽  
LAG Aylmore ◽  
JP Quirk
Keyword(s):  
Particle Size ◽  
Pore Size ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Particle Size Analysis ◽  
The Other ◽  
Clay Soils ◽  
Size Analysis ◽  
Size Distributions ◽  
Pore Size Distributions

Pore size distributions using mercury injection and nitrogen sorption techniques were determined on a number of soils classified as clays on the basis of particle size analysis. Some of these soils exhibit markedly different consistencies during texturing and undergo changes in texture during prolonged manipulation, e.g. subplastic, superplastic and self-mulching soils. The pore size distributions for these soils do not differ significantly from those obtained for the normal labile clay soil in the pore size range 2 nm to 50 �m. The clay soils examined, with the exception of the krasnozem, have the majority of their pore volume within pores smaller than 10 nm with the predominant pore size centred around 3 nm plate separation. In the case of the krasnozem, the particle size analysis does not correspond to the texture assessment as a clay loam. Surface and subsoil samples of the krasnozem have high porosities and predominant plate separations of 6 nm. They consequently possess significantly different pore size distributions from the other clays. In the case of the surface sample, only a small proportion of its total pore volume is in pores smaller than 10 nm. These differences in pore structure observed between the krasnozem and the other soils examined may result from differences in mineralogy, and in particular from the high sesquioxide content of the krasnozem.

scholarly journals The comparison of experimental and calculated pore size distributions of activated carbons

Carbon ◽  
2002 ◽  
Vol 40 (3) ◽  
pp. 383-388 ◽  
Author(s):  
F Stoeckli ◽  
A Guillot ◽  
A.M Slasli ◽  
D Hugi-Cleary
Keyword(s):  
Pore Size ◽  
Activated Carbons ◽  
Size Distributions ◽  
Pore Size Distributions
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