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| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
MAT.P-402 |
| Subject |
Phosphate adsorption behavior and luminescent property of layered yttrium hydroxide in aqueous solutions |
| Authors |
MINHEE KIM, Song-ho Byeon*
Department of Applied Chemistry, Kyung Hee University, Korea
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| Abstract |
Excessive phosphorus (as phosphates in water) can cause serious eutrophication in lakes, reservoirs, rivers and oceans. On the other hand, phosphorus is essential nutrients for all living organisms, and applying to agriculture as fertilizer is important for food production. Given that only about 1/5 of phosphate fertilizers are included in the diet of humans and animals consumed by humans, most of them flow through food production and consumption. Therefore, special interest is needed to develop efficient materials that can recover phosphorus from environmental waters to reuse. In this study, we explored the possible applications of layered yttrium hydroxide l-Y(OH)3 as an adsorbent for the phosphate recovery from water over a wide pH range. Compared to that (pHpzc < 4) of hexagonal form h-Y(OH))3, the surface charge of l-Y(OH)3 is strongly positive up to pH ~ 11 (pHpzc ~ 11). This new adsorbent revealed high capacity, efficiency, stability, selectivity, and reusability in adsorption of phosphate from a single electrolyte as well as natural waters containing competing anions. In particular, when Ce3+ and Tb3+ were co-doped ( l-Y(OH)3:Ce,Tb), phosphate adsorption led to the characteristic 5D4 → 7FJ (J = 6, 5, and 4) emissions of Tb3+ under commercial 312 nm-UV irradiation. This “luminescence-on” behavior of l-Y(OH)3:Ce,Tb by phosphate adsorption was employed to detect and recover phosphorus at low concentrations in deionized water, mineral water, tap water, and river water. |
| E-mail |
mini3026@naver.com |
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120th General Meeting of the KCS