Estimation of surface area and pore volume of activated carbons by methylene blue and iodine numbers

Nunes, Cleiton Antônio; Guerreiro, Mário César

doi:10.1590/s0100-40422011000300020

Cited by 166 publications

(78 citation statements)

References 12 publications

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“…Two charcoal materials were added to randomly selected sample units in amounts corresponding to 2% or 4% by weight (Table 4): activated charcoal (Merck KGaA, iodine adsorption ≥ 890 mg g -1 , methylene blue adsorption ≥ 180 mg/g, pH H2O = 10.10) and crushed and sieved (0.2 mm) household charcoal (Skogens kol AB, pyrolysis temperature ≥ 600 • C, Brunauer-Emmet-Teller (BET) surface area = 8 m 2 g -1 , produced from deciduous trees, pH H2O = 7.16). For activated charcoal, BET was calculated to ≥790 m 2 /g according to Nunes and Guerreiro (2011).…”

Section: Methodsmentioning

confidence: 99%

Charcoal Application to Arable Soil: Effects on CO₂Emissions

Carlsson¹,

Andrén²,

Stenström³

et al. 2012

Communications in Soil Science and Plant Analysis

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Activated carbon and commercial household charcoal were added to soil in a 36-day incubation study at 20 • C measuring carbon dioxide evolution. The black carbon materials were found to decompose slowly, releasing between 1.4% and 0.8% of their carbon content per year, respectively. The main experiment tested whether the black carbon additions to soil (2% and 4% by mass) affected decomposition of selected substrates in soil, both respiration dynamics and total respiration. The results indicated that the black carbon materials tested had no effect on total respiration from added glucose. However, decomposition rates of amylose, xylan, casein, and ryegrass were reduced in soil with addition of activated carbon but were not significantly affected by household charcoal. A larger surface area of activated carbon than that of household charcoal, and thus a greater adsorption capacity for organic compounds and exo-enzymes required to break down water-insoluble substrates, may explain the results.

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Section: Methodsmentioning

confidence: 99%

Charcoal Application to Arable Soil: Effects on CO₂Emissions

Carlsson¹,

Andrén²,

Stenström³

et al. 2012

Communications in Soil Science and Plant Analysis

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“…In spite of this, no detailed study has been found concerning the quantitative realationships between methylene blue and iodinen numbers and the stuctural characteristics of the AC (Nunes and Guerreiro, 2011).…”

Section: Figure 1 Horizontal Furnacementioning

confidence: 99%

“…The surface area of activated carbon are usually measured using the Brunauer-Emment-Teller (BET) method, which employs the nitrogen adsorption at different pressure at the temperature of liquid nitrogen (Nunes and Guerreiro, 2011). Additional information about the structure of activated carbons can be obtained by the adsorption characteristics of differerent adsorbates, such as methylene blue and iodine adsorption.…”

Section: Figure 1 Horizontal Furnacementioning

confidence: 99%

Potential study of Indonesia coal for adsorbed natural gas

Monika¹

2017

IMJ

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Low rank coal was used as a precursor for the preparation of adsorbed natural gas by chemical activation with KOH-NaOH mixtures. Chemical activation process is commonly used and involves two major steps, which are heating process and chemical treatment process. The experiments were used in the various of temperatures, contact times, and rasio of sample and chemical compound. The result of process was obtained of the iodine number around of 1004 mg/g and 1198 mg/g . Based on the other study, the iodine number at 1004 mg/g and 1198 mg/g have surface area between 1000 mg/g up to 1200 mg/g. These surface area provide a methane capacity between 75 mg/g up to 80 mg/g. Keywords: activated carbon, adsorbed natural gas, surface area, iodine number. ABSTRAK

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“…The polar groups are responsible for a higher methylene blue adsorbed amount, which leads to an intensification of the stain colour, thus providing information about the performance of the material (testing of UV-protective coatings, correlation with the water adsorption values). Methylene blue adsorption from aqueous solutions has been widely used in determinations regarding the oxidation degree for cellulosic materials or for surface area determinations of different oxide materials, calcium carbonate [10], graphite, activated carbons, yeast [11,12], etc. Also, staining with this dye is frequently used in medicine and microbiology in order to enhance the visibility of the cellular components or to highlight possible dysfunctionalities (such as abnormal growth) [13].…”

Section: Introductionmentioning

confidence: 99%