2016 Fiscal Year Annual Research Report
環境材料として機能化した層状複水酸化物ナノシートの設計
| Project/Area Number |
15F15380
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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) |
PAULMANICKAM KOILRAJ 九州大学, 工学研究院, 外国人特別研究員
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| Project Period (FY) |
2015-11-09 – 2018-03-31
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| Keywords | nano-materials / colloids / LDHs / adsorption |
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| Outline of Annual Research Achievements |
(1) Sorption of Co2+, Ni2+ and Cu2+ on LDH nanosheets.
The presence of amino acid on the surface of LDH proved by FT-IR, 1H MAS-NMR and TEM EDS analyses. The colloidal LDH nanosheets was utilized for the removal of Co2+, Ni2+ and Cu2+ from aqueous solution. It depicted that the maximum adsorption capacity of 0.598, 0.601, 0.030 mmol/g for Co2+, Ni2+ and Cu2+ respectively in the single solution. The selectivity of Co2+ was high in both the binary mixed solution. The selectivity of metal cations are in the order of Co2+ > Ni2+ >and Cu2+. The mechanism of Co2+ adsorption on the amino acid anchored LDH occurs due to the diamine- like coordination. On the other hand, the Cu2+ adsorption occurs by glycine-like coordination with amino acid, rendering very poor sorption capacity of Cu2+.
(2) Sorption of halides and oxyhalides on LDH nanosheets.
The amino acid functionalized colloidal LDH nanosheets was sorption of halides (F-, Cl- , Br- and I- ) and oxy halides (IO3-, BrO3- and ClO4-) on colloidal LDH nanosheets and discussed the mechanism of sorption based on equilibrium pH, zeta potential, hydrated ionic radius and hydration free energy of corresponding anions. The sorption of halides on colloidal LDHs indicates that sorption followed Hofmeister ionic series of ionic activity except nitrate (F- > NO3- > Cl- > Br- > I-). However, in the case of oxyalides the sorption of anion followed the reverse order of corresponding halides, (IO3- > BrO3- > NO3- > ClO4-). Simulation studies indicated that the order of halide adsorption is directly related to the free energy of adsorption.
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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
LDH nanosheets の合成、特性化、環境材料としての評価を進め、3報の査読つき論文に成果公表できたので、おおむね順調に進んでいる。
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| Strategy for Future Research Activity |
Decoration of Fe or Ru nanoparticle on the surface of LDH nanosheets will be performed by the reduction of chelating ligand stablished cation or the reduction of surface adsorbed anionic metal complexes and their physicochemical analysis.
Evaluation of their uptake mechanism, and understanding of the reduction pathways by different analyses such as EXAFS and XPS.
Demonstration of functionalized and metal nano particle decorated nanosheets for the “onsite” remediation in laboratory scale to mimic the real wastewater streams.
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Research Products
(6 results)
