2017 Fiscal Year Annual Research Report
ナノ粒子Pdの形成場としての自己組織化イオン液体修飾酸化グラフェン複合体の合成
| Project/Area Number |
17F17081
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| Research Institution | Kyushu University |
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Principal Investigator |
笹木 圭子 九州大学, 工学研究院, 教授 (30311525)
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| Co-Investigator(Kenkyū-buntansha) |
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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| Project Period (FY) |
2017-04-26 – 2019-03-31
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| Keywords | Ionic liquid / Graphene oxide / Palladium extraction / Radioactive palladium / Organo-montmorillonite / Perchlorate removal / Gemini surfactant |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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Research Products
(1 results)
