Title: Caesium and strontium adsorption ability of activated bamboo charcoal

Authors: Shingo Hayakawa; Soichiro Matsubara; Yusuke Sumi; Syo Yamamoto; Norihisa Kawamura; Toru Nonami

Addresses: Department of Information Science, Graduate School of Chukyo University, 101-2, Yagotohonmachi, Nagoya Showa-ku, Aichi, Japan ' Department of Information Science, Graduate School of Chukyo University, 101-2, Yagotohonmachi, Nagoya Showa-ku, Aichi, Japan ' Department of Mechanical and Systems Engineering, Chukyo University, 101-2, Yagotohon-machi, Nagoya-shi Showa-ku, Aichi, Japan ' Institute Advanced Studies in Artificial Intelligence, Chukyo University, 101 tokodachi, kaizu-cho, Toyota-shi, Aichi, Japan ' Institute Advanced Studies in Artificial Intelligence, Chukyo University, 101 tokodachi, kaizu-cho, Toyota-shi, Aichi, Japan ' Department of Information Science, Graduate School of Chukyo University, 101-2, Yagotohonmachi, Nagoya Showa-ku, Aichi, Japan

Abstract: We developed an activated charcoal by creating bamboo charcoal that was carbonised at a temperature between 400 to 1000°C and then kept it at a temperature of 270°C for 2 h. One gram of activated charcoal was added to 100 mL of aqueous caesium of 2.67 × 10^-2 mmol/L and 100 mL of strontium aqueous solution, and was stirred for 1 h. The caesium adsorption amount of bamboo charcoal, which was carbonised at 400°C, increased from 70.0% to 88.9%. In addition, the amount of strontium absorbed increased from 76.5% to 89.0 % because of the activation. The pH of the activated charcoal increased along with an increase in the carbonation temperature. The pH of the activated charcoal that was carbonated at 400°C was 5.2, and that for the activated charcoal carbonated at 1000°C was 9.74. We also determined that the pH of activated charcoal and the amount of caesium absorbed had a strong correlation, and the correlation coefficient was 0.987. The caesium absorption capacity of bamboo charcoal is said to be related to the acid functionality of the surface rather than the size of the surface area. Therefore, it was considered that generation of a new acidic functional group was a factor that improved adsorption ability.

Keywords: bamboo charcoal; carbonisation; activated carbon; adsorption; caesium; strontium; surface functional groups.

DOI: 10.1504/IJNT.2018.098434

International Journal of Nanotechnology, 2018 Vol.15 No.8/9/10, pp.683 - 688

Published online: 22 Mar 2019 *

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