| 研究実績の概要 |
Owing to the great financial support from JSPS, significant results and outcomes have been achieved. Based on the previous research of paper-based sensor, effect of pH and temperature, measurement accuracy and storage were further studied. Therefore, a user-friendly, low-cost, sensitive and ion-species-selective paper-based sensor to inspect drinking and industrial water for excessive levels has been successfully developed, especially for people in developing countries.
In addition, a new topic has been started and now in progress to develop a cellulose-based absorbent modified with quinizarin for selective copper ion recovery from waste water. So far, the cellulose-based absorbent has been successfully prepared. It was reinforced using cellulose nanofiber for better physical strength. And the copper ion adsorption, effects of pH, selectivity and recyclability have been studied. The results show that a pure, porous, low-cost, biodegradable and recyclable cellulose absorbent reinforced using cellulose nanofiber was successfully prepared and non-covalently modified with quinizarin for the selective recovery of copper ion from water. It is porous but physically strong. And it shows good capacity, recyclability and selectivity for copper ion recovery from water in practical application.
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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
To summarize the experiment so far, the research is implemented as we expected in the research plan.
A dual-function paper-based sensor for qualitative and quantitative detection of copper ion in water has been successfully developed. Besides, a pure, porous, low-cost, biodegradable and recyclable cellulose-based absorbent reinforced using cellulose nanofiber was successfully prepared and non-covalently modified with quinizarin for the selective recovery of copper ion from water. We prepared porous cellulose disks by the viscose process, reinforced the disks with cellulose nanofiber, and functionalized cellulose disks non-covalently with quinizarin. Cellulose nanofibers prepared by aqueous counter collision method (ACC-CNF) as reinforcement agents for the cellulose sponge were added to gain better physical strength and endurance. Moreover, the quinizarin functionalized cellulose disks were evaluated in copper ion adsorption and the effect of other parameter such as pH, selectivity and recyclability. As a result, the cellulose-based absorbent shows good capacity, recyclability and selectivity for copper recovery from water in practical application.
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| 今後の研究の推進方策 |
The future plan is to finish this research by adding the following experiments:
1. Additional characterization, by using scanning electron microscope to observe the cellulose-based absorbent and the ones reinforced with cellulose nanofiber and modified with quinizarin, and measure the surface area and pore size of the cellulose-based absorbents; 2. Completion of kinetic, thermodynamic, and isotherm studies; 3. Study of the crystal change of aqueous counter collision-cellulose nanofiber in cellulose sponge formation.
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