Preparation of Bamboo Activated Carbon using Low-temperature Carbonization and Air Oxidation

Sakuma, Miki; Amano, Yoshimasa; Machida, Motoi

doi:10.3985/jjsmcwm.22.337

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…The flow rate of atmospheric gas supplied was 200 mL/min. The yield Y (%) of rice hull coal was calculated according to the following formula [14][15]:…”

Section: Experimental Methods 21 Preparation Of Rice Hull Charcoalmentioning

confidence: 99%

Relationship between the Presence and Absence of Oxygen at the Time of Carbonization of Rice Hull Charcoal and Adsorption Abilities toward Cesium and Strontium

Sato

Kobayasi

Kawamura

et al. 2018

Trans. Mat. Res. Soc. Japan

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The relationships of adsorption abilities of cesium and strontium in the presence or absence of oxygen in the atmosphere during carbonization of rice hull charcoal was investigated. Rice hulls were carbonized at 400-1000 °C by flowing nitrogen gas containing 100% nitrogen or 3% oxygen. The amount of acidic functional groups was higher with 3% oxygen. The rice hull charcoal carbonized in any atmosphere decreased the amount of acidic functional groups with increase in carbonization temperature. A correlation was found between cesium adsorption rate and acidic functional group content. However, there was no correlation between strontium adsorption rate and acidic functional group content. The specific surface area was largest at 237 cm 2 /g at 800 °C for charcoal carbonized with 3% oxygen and largest at 124 cm 2 /g at 600 °C for charcoal carbonized with 0% oxygen. From the measurement results of pore distributions, it was found that the volumes of mesopores were larger in charcoal carbonized in 3% oxygen atmosphere than that carbonized under 0% oxygen. There was a high correlation between the pore volume of mesopores and the adsorption amount of strontium. It seemed that rice hull charcoal carbonized with 3% oxygen had a large adsorption rate of strontium.

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“…The flow rate of atmospheric gas supplied was 200 mL/min. The yield Y (%) of rice hull coal was calculated according to the following formula [14][15]:…”

Section: Experimental Methods 21 Preparation Of Rice Hull Charcoalmentioning

confidence: 99%

Relationship between the Presence and Absence of Oxygen at the Time of Carbonization of Rice Hull Charcoal and Adsorption Abilities toward Cesium and Strontium

Sato

Kobayasi

Kawamura

et al. 2018

Trans. Mat. Res. Soc. Japan

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“…The yield Y (%) of rice hull charcoal carbonized at each temperature was calculated according to the following equation. 16,17) Y…”

Section: Preparation Of Rice Hull Charcoalmentioning

confidence: 99%

Rice Hull Charcoal for Adsorption of Cesium and Strontium in Aqueous Solution

et al. 2019

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The adsorption capacity of rice hull charcoal for cesium and strontium in aqueous solution was examined. Rice husk carbonized at various temperatures was added to aqueous solutions of cesium and strontium and stirred, whereupon, samples carbonized at 400°C adsorbed cesium, and those carbonized at 800°C adsorbed strontium. In view of this result, it was inferred that the mechanisms of adsorption of cesium and strontium on rice hull charcoal are different. FTIR analysis and Boehm titration results indicated that charcoal carbonized at 400°C had acidic functional groups. In addition, the pH of the rice hull charcoal carbonized at high temperature tended to be higher, which is attributed to precipitation of inorganic substances such as potassium on the surface of rice hull charcoal. Pore distribution measurements showed that many mesopores were formed in rice hull charcoal carbonized at 800°C. It was concluded that cesium adsorbs primarily on acidic functional groups on the surface of rice hull charcoal and strontium undergoes ion exchange with potassium, or adsorbs on mesopores.

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Adsorption Properties of Rice Hull Charcoal for Cesium and Strontium in Aqueous Solution

Kobayashi

Noda

Shibata

et al. 2018

J. Soc. Mat. Sci., Japan

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The adsorption capacity of cesium and strontium in the aqueous solution of rice hull charcoal was examined. Rice husk which was carbonized at various temperatures was added to each of cesium aqueous solution and strontium aqueous solution and stirred. As a result, rice hull charcoal carbonized at 400°C adsorbed the cesium. Rice hull charcoal carbonized at 800°C adsorbed the strontium. From this result, it was considered that the adsorption mechanism of rice hull charcoal cesium and strontium are different. From the analysis results by FTIR and Boehm method, charcoal carbonized at 400°C had acidic functional group. There was a tendency that the pH of the rice hull charcoal carbonized at high temperature became higher. It is considered to be due to precipitation of inorganic substances such as potassium on the surface of rice hull charcoal. As a result of pore distribution measurement, it was found that many mesopores were formed in rice hull charcoal carbonized at 800°C. It is assumed that cesium adsorbs primarily on acidic functional groups on the surface of rice hull charcoal, strontium undergoes ion exchange with potassium, or adsorbs to mesopores.

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Preparation of Bamboo Activated Carbon using Low-temperature Carbonization and Air Oxidation

Cited by 4 publications

References 23 publications

Relationship between the Presence and Absence of Oxygen at the Time of Carbonization of Rice Hull Charcoal and Adsorption Abilities toward Cesium and Strontium

Relationship between the Presence and Absence of Oxygen at the Time of Carbonization of Rice Hull Charcoal and Adsorption Abilities toward Cesium and Strontium

Rice Hull Charcoal for Adsorption of Cesium and Strontium in Aqueous Solution

Adsorption Properties of Rice Hull Charcoal for Cesium and Strontium in Aqueous Solution

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