2023 Fiscal Year Final Research Report
Development of plasma treatment apparatus for granular active carbide as Cs adsorbent with volume-reducing ability and backup performance
| Project/Area Number |
22K18833
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 22:Civil engineering and related fields
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| Research Institution | Kyushu University |
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Principal Investigator |
KUBA Takahiro 九州大学, 工学研究院, 教授 (60284527)
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| Co-Investigator(Kenkyū-buntansha) |
藤林 恵 九州大学, 工学研究院, 助教 (70552397)
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| Project Period (FY) |
2022-06-30 – 2024-03-31
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| Keywords | セシウム / プラズマ処理 / 炭化物 / 活性炭 / 吸着 / ドライ賦活化プロセス |
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| Outline of Final Research Achievements |
Researchers are looking to find an effective adsorbent for the Cs (cesium) removal from wastewater or natural environment. Among the different adsorbents, functional activated carbon (AC) demonstrated a significant result for Cs removal. However, chemical treatment on AC is always difficult and environmentally unfriendly. Therefore, plasma treatment on AC to make it functionalized is one of the alternative choices.
In this study, AC was treated with plasma under oxygen atmosphere by changing effect of its material, specific surface area and particle size, and also distance between electrodes of plasma processor, followed by Cs adsorption batch test. This study concludes that the adsorbent material and particle size, and also distance between electrodes and voltage are critical parameters in plasma treatment for utilizing Cs adsorption and that the specific surface area of the sample has no effect on the amount of Cs adsorption.
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| Free Research Field |
水環境工学
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| Academic Significance and Societal Importance of the Research Achievements |
当研究室では、多くの実績を有するゼオライトのCs吸着能に匹敵し得る竹炭・木炭の化学的賦活化手法を確立したことから、竹炭・木炭・活性炭といった炭化物の持つメリット、すなわち、焼却により最終処分量の大幅減容化に応用できる。一方で、化学的賦活化の欠点 (長時間・高コスト・比表面積減少、ウェットプロセスであるが故に廃水の処理費が必要) を補う新たな手法として、大気圧非平衡プラズマによる賦活化手法に着目した。これはドライプロセスであることから、緊急時のバックアップ吸着剤として長期保存が可能であること、また、再度の賦活化も容易であることが予想され、実際に、それを実験的に証明した。
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