Preparation of activated carbon from bamboo (phyllostachys heterocycla) and influence of potassium fraction on activation process

Wakisaka, Hiroyuki; Miyake, Hajime; Kawahara, Yutaka

doi:10.7209/tanso.2006.272

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…The ash of bamboo includes various elements especially much amount of potassium which significantly contributes to the development of surface area 17) . In this study the air oxidation treatment for the bamboo charcoals was conducted without any treatments for ash removal.…”

Section: Air Oxidation Treatment Of the Prepared Bamboo Charcoalsmentioning

confidence: 99%

“…Wakisaka et al 17) and Haiping et al 25) reported the effect of potassium for the carbonization of activated carbons and found that potassium could promote the activation with considerable developments of both surface area and pore volume. In this study the highest content of potassium was observed in the ash of bamboo charcoals thereby significant developments of surface area and pore volume could be expected for the air oxidation treatment.…”

Section: Surface and Pore Properties Of The Air Oxidation Bamboo Charmentioning

confidence: 99%

“…A little increases in the surface area and total pore volume were observed for the oxidation temperatures of both 180 (BC-AO-180) and 280 °C (BC-AO-280) while the surface area total pore volume and mesopore and macropore volume indicated approximately 3 times 2 times and 2.5 times higher values than those for non-oxidized bamboo charcoals (BC) respectively at the oxidation temperature of 380 °C (BC-AO-380). According to the report from Wakisaka et al 17) potassium in bamboo charcoal could significantly lead to the increase in weight loss in CO 2 gas activation process. On the other hand Haiping et al examined the effect of K 2 CO 3 on pyrolysis temperature for cellulose and revealed that K 2 CO 3 could lower the onset temperature for pyrolysis 25) .…”

Section: Surface and Pore Properties Of The Air Oxidation Bamboo Charmentioning

confidence: 99%

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Water vapor adsorption-desorption properties of bamboo charcoals prepared by air oxidation following low temperature carbonization

Sakuma

Amano

Machida

2012

TANSO

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Bamboo charcoals were prepared by low temperature carbonization at 500 °C and subsequent treatments such as air oxidation at 180-380 °C for the introduction of functional groups on the surface and outgassing at 1000 °C for their removal were conducted to examine the relationship between the amount of water vapor adsorption and the surface properties of the prepared charcoals. The air oxidation treatment was effective in developing surface area and pore volume as well as surface functional groups and the developments were in proportion to the treatment temperature. Air oxidation of the prepared charcoal at 380 °C increased surface area from 250 m 2 /g to 590 m 2 /g and pore volume from 0.16 mL/g to 0.31 mL/g. At a relative humidity below 50% the charcoals oxidized at 380 °C were able to adsorb approximately twice the amount of water vapor compared to those oxidized at 180 °C and 280 °C indicating that the water vapor adsorption depends on the surface functional groups. In a relative humidity above 50% the outgassed bamboo charcoals adsorbed a large amount of water vapor indicating that mesopores and macropores rather than surface functional groups contributed to water vapor adsorption.

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Section: Air Oxidation Treatment Of the Prepared Bamboo Charcoalsmentioning

confidence: 99%

Section: Surface and Pore Properties Of The Air Oxidation Bamboo Charmentioning

confidence: 99%

Section: Surface and Pore Properties Of The Air Oxidation Bamboo Charmentioning

confidence: 99%

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Water vapor adsorption-desorption properties of bamboo charcoals prepared by air oxidation following low temperature carbonization

Sakuma

Amano

Machida

2012

TANSO

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“…In the case of bamboo, ca. 1 wt% of ash is included, and the main component (80-90 wt%) of the ash is potassium [19,20]. Thus, the additional activation effects by naturally included potassium are expected via simple steam activation.…”

Section: Introductionmentioning

confidence: 99%

Pore structure and the properties of electric double layer capacitor electrode of bamboo-derived activated carbon prepared by superheated steam

et al. 2018

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Bamboo-derived activated carbon prepared by superheated steam (BAC) exhibited performance for utilization as an electric double layer capacitor (EDLC) electrode. Pore structure and EDLC performances were investigated by comparison with phenol resin-derived activated carbon (MSP-20), which is commercially available and often used for the purpose. The nitrogen adsorption isotherm showed that BAC had a large BET-specific surface area of 1268 g/m 2 with a developed pore structure, especially of the mesopore, in comparison with MSP-20. It is considered that inherent ash in bamboo promoted activation, in addition to physical activation by superheated steam. Capacitance per electrode volume (C V) was 52 F/cm 3 with BAC. Because the density of BAC is high (0.78 g/cm 3) compared with that of MSP-20 (0.58 g/cm 3), sufficient C V for usage was obtained, although the capacitance per electrode mass (C M) at 5 mA/cm 2 itself of BAC (67 F/g) was lower than that of MSP-20 (126 F/g). With IR drop, the resistance value of BAC (9.7 Ω) was lower than that of MSP-20 (10.5 Ω). Especially, the diffusion resistance of BAC disclosed to be smaller than that of MSP-20. These results indicated that BAC produced by steam activation is a promising material with a pore structure suitable for ion transfer in EDLC.

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“…The present authors have been studying structure and properties of carbons derived from various cellulosic materials [10,11]. Carbonization of cellulosic materials usually proceeds through a solid phase and the carbons obtained show peculiar textures reflecting the original textures of the starting materials such as the cellular structure.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Triacetylcellulose Waste for the Production of Carbonaceous Adsorbents

et al. 2012

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Triacetylcellulose(TAC)-based globular activated carbons having the adsorption capacity comparable with commercial ones have been derived using a carbonization system developed for this purpose. The carbonization of TAC proceeds through a liquid phase causing bubbling due to the emission of the decomposition gases. The phosphorus compounds resulting from the starting material of TAC waste promote the activation reactions to produce micro-pores.

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Preparation of activated carbon from bamboo (phyllostachys heterocycla) and influence of potassium fraction on activation process

Cited by 6 publications

References 2 publications

Water vapor adsorption-desorption properties of bamboo charcoals prepared by air oxidation following low temperature carbonization

Water vapor adsorption-desorption properties of bamboo charcoals prepared by air oxidation following low temperature carbonization

Pore structure and the properties of electric double layer capacitor electrode of bamboo-derived activated carbon prepared by superheated steam

Utilization of Triacetylcellulose Waste for the Production of Carbonaceous Adsorbents

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