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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Phosphate adsorption on the iron oxyhydroxides goethite (α-FeOOH), akaganeite (β-FeOOH), and lepidocrocite (γ-FeOOH): a 31P NMR Study

등록일
2012년 2월 16일 16시 05분 20초
접수번호
1145
발표코드
INOR.O-8 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 12시 : 30분
발표형식
구두발표
발표분야
무기화학 - General Oral Presentation
저자 및
공동저자
김종식, Wei Li1, Brian L. Phillips2, Clare P. Grey3
동아대학교 화학과, Korea
1Delaware Environmental Institute, University of Delaware, United States
2Department of Geosciences, Stony Brook University, United States
3Chemistry Department, University of Cambridge, United Kingdom

Phosphate adsorption on the surfaces of the iron oxyhydroxide polymorphs goethite, akaganeite, and lepidocrocite were studied by using 31P static spin-echo mapping NMR experiments to determine how this environmentally-important anion binds to common soil minerals. The large 31P hyperfine shifts confirm the formation of inner-sphere complexes between the phosphate anion and the iron oxyhydroxide surface, the large shifts indicating the presence of Fe3+?O?P covalent bonds. Binding was explored as a function of pH and phosphate concentrations, the phosphate ion binding via two oxygen ions to the oxyhydroxide surface under all conditions and for all the surfaces. To support our analysis of the NMR spectra, adsorption of dimethyl phosphinic acid (DPA) on iron oxyhydroxides was also investigated, since this ion can only bond via one Fe?O?P interaction to the surface. The 31P hyperfine shifts observed for this anion were 50% of those seen for the phosphate anions, confirming that the phosphate ions bind to the surface via two P?O?Fe linkages.


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