| 研究実績の概要 |
The highest amount of adsorption of As (III) by DMAPAAQ + FeOOH gel was 27.68 mg/g and the adsorption followed the Langmuir isotherm. The gel selectively adsorbed As (III) with the presence of co-existing sulphate and chloride ions of upto 20 mM. The reusability of DMAPAAQ + FeOOH gel for adsorption of As (III) and As (V) for eight complete consecutive cycles could be achieved, with the same pieces gel being used throughout the eight cycles. TEM images showed that there were 6-13 nm of iron particles in the gel structure. Also, there was 62.01 wt% of iron hydroxide contents in the gel, suggested by TG analysis. XRD analysis suggests that the polymer structure of the DMAPAAQ + FeOOH gel is amorphous. The adsorption mechanism for both As (III) and As (V) were confirmed by XPS analysis.
|
| 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
The results of our research, removal of As (V) using a composite of polymer gel and iron hydroxide, were published in two renowned international journals. Also, we made an oral and two poster presentations at two international conferences. Moreover, we achieved an Excellent Poster Award. Currently, we are conducting the research on removal of As (III), which is more difficult to remove because it is hard to oxidize. Although we fulfilled our objectives, we could have achieved more if we had the instrument to detect As(III) and As(V) separately. Because of not having the instrument, we invested our time to finding an alternative. For this reason, we could not progress after autumn as much as we originally planned. We hope to find a solution soon and make good progress in 2020.
|
| 今後の研究の推進方策 |
In future, our plan is to examine the conversion of rate between As(III) and As (V) during the adsorption process. Also, we will study the increase in oxidation of As (III) into As (V). Our first specific objective to fulfill the plan is to find the proper instrument to accurately and specifically measure As (III) and As (V) separately. This step is important to measure the amount of As(III) being oxidized into As (V). In addition, we will examine, the increase of amount of As(III) being oxidized because of using our gel, DMAPAAQ + FeOOH. Our broad objective is to focus on increasing the adsorption amount of total arsenic.
|
