| 研究課題/領域番号 |
17F17081
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| 研究機関 | 九州大学 |
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研究代表者 |
笹木 圭子 九州大学, 工学研究院, 教授 (30311525)
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| 研究分担者 |
KANCHARLA SRINIVASARAO 九州大学, 工学(系)研究科(研究院), 外国人特別研究員
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| 研究期間 (年度) |
2017-04-26 – 2019-03-31
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| キーワード | Ionic liquid / Graphene oxide / Palladium extraction / Radioactive palladium / Organo-montmorillonite / Perchlorate removal / Gemini surfactant |
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| 研究実績の概要 |
Aminopropylimidazolium 2,2’-(ethylenedithio)diacetate ionic liquid functionalized
graphene oxide ((Im) 2 DTDA-GO) was prepared and utilized for the extraction of palladium (Pd) from HCl and HNO 3 medium. The synthesis of (Im) 2 DTDA-GO was
achieved in two steps. In the first step, GO was covalently functionalized with 1-3 (aminopropyl) imidazole through amide bond formation to prepare Im-GO. In the second step, Im-GO was treated with 2,2’-(ethylenedithio)diacetic acid to synthesize the(Im) 2 DTDA-GO. The Im-GO has shown a promising ability to extract the Pd from HCl medium (Pd adsorption was 0.92 mmol/g of Im-GO; amount of active N sites present was 0.87 mmol/g of Im-GO), mostly through electrostatic interaction with the anionic form PdCl42-, whereas the efficiency of Im-GO was limited in HNO3 medium where Pd exist as metal cation. The high level radioactive waste (HLRW) of nuclear cycle contains several metal ions along with Pd of longer half-life in 1-3 M HNO3 medium. The stability of the developed adsorbent in such strongly acid medium is one of the challenging task for the selective extraction and storage of radioactive Pd.The prepared (Im) 2 DTDA-GO is stable in high acidic medium and have shown promising ability for Pd extraction from such a strongly acidic medium.
In addition, gemini surfactant modified-montmorillonite (GCn-Mt) were prepared for the adsorption of perchlorate (ClO4－) from aqueous solution. The GC n-Mt has shown enhanced adsorption ability for ClO4－ than the previously reported single chain modified montmorillonites.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Aminopropylimidazolium 2,2’-(ethylenedithio)diacetate ionic liquid functionalized
graphene oxide ((Im) 2 DTDA-GO) was successfully synthesized and characterized by H-NMR and C-NMR. Based on fundamental results of Pd adsorption capacity on Im-GO in HCl matrix, the adsorption mechanism can be expected to be electrostatic interaction of the anionic form PdCl42- with N in Im-GO, because the molar ratio of Pd, The great performance was not observed in HNO3 matrix because of the form of Pd2+. Key points were overcome.
Synthesis of the composite with Fe3O4 has not yet been carried out. Adsorption of Am(III), Cm(III) on Im-GO in the matrix of HCl has also not yet been examined.
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| 今後の研究の推進方策 |
1. Preparation of ligands having ethylenedithio functional group for the selective extraction of Pd through solvent extraction technique.
2. Preparation of palladium nanoparticles from the extracted Pd ions.
3. Development of novel functional materials for the extraction of Pd.
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