2022 Fiscal Year Final Research Report
Development of new adsorbent based on calcium carbonate and elucidation of removal mechanism of contaminants such as arsenic
Project/Area Number |
19K12388
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 64020:Environmental load reduction and remediation-related
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Research Institution | Azabu University |
Principal Investigator |
Inaba Kazuho 麻布大学, 生命・環境科学部, 教授 (60176401)
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Project Period (FY) |
2019-04-01 – 2023-03-31
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Keywords | ヒ素吸着剤 / 表面分析 / 包埋加工 / 途上国支援 |
Outline of Final Research Achievements |
The size of the new adsorbent, its ease of handling for practical use, and the effect of the embedding process by gel were examined from elemental analysis by X-ray fluorescence analysis and SEM, and from surface observation. In addition, batch adsorption tests were conducted using the prepared embedded adsorbent. As a result, the appropriate particle size and adsorption time were clarified. From the results of surface observation, it was found that the adsorbent adhered to the gel wall when the encapsulation process was applied, and that the signal intensity of calcium and iron was detected higher in the encapsulated adsorbent after arsenic adsorption than before adsorption, suggesting that the adsorbent gradually breaks down from the wall by agitation for a long time even after encapsulation in the gel. Alkaline solution was effective for arsenic desorption, but alginate was less tolerant and was broken by agitation.
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Free Research Field |
環境改善技術
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Academic Significance and Societal Importance of the Research Achievements |
本課題の鉄系吸着剤は、従来報告されてきたヒ素(III)吸着剤の組成とは異なる構造であり、新規性を有している。さらに、最大吸着量は劣るものの、合成が簡便で安全であること、水産廃棄物を使用するため安価であることなどの特徴を有している。物理的衝撃により破砕しやすいという欠点はあるものの、包埋加工することである程度保護することができる。このような特徴はバングラデシュなどの途上国における飲料水汚染の解決に有効と考えられ、社会的な意義は大きいと言える。また、本吸着剤はセレンの吸着にも利用できること、合成に硫酸銅を使用するとアンモニアガスを回収できることなど、応用性も高い。
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