서지주요정보
Study on the adsorption of cadmium species on the montmorillonite using $^{113}Cd$ NMR spectroscopy = 113 카드뮴 핵자기 공명 분광 분석을 이용한 몬트모릴로나이트에 흡착된 카드뮴 핵종에 관한 연구
서명 / 저자 Study on the adsorption of cadmium species on the montmorillonite using $^{113}Cd$ NMR spectroscopy = 113 카드뮴 핵자기 공명 분광 분석을 이용한 몬트모릴로나이트에 흡착된 카드뮴 핵종에 관한 연구 / Song-Hui Jun.
저자명 Jun, Song-Hui ; 전송희
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006767

소장위치/청구기호

학술문화관(문화관) 보존서고

MCH 96022

SMS전송

도서상태

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반납예정일

초록정보

We report the use of $^{113}Cd$ NMR spectroscopy for the identification of cadmium species that are adsorbed when montmorillonite are in contact with aqueous $CdCl_2$ solution. This was done by (a) determining the change in the concentration od cadmium and chloride concentrations in the supernatant solutions from the peak intensity and chemical shift data and (b) $^{113}Cd$ MAS NMR on the sedimented montmorillonite that has been cadmium exchanged. Montmorillonite is a 2:1 type layer, smectite group, dioctahedral clay and general approximate formula of montmorillonite is as follows ; ◁수식 삽입▷(원문을 참조하세요) Four series of the sample solutions $([CdCl_2] = 5.14\times10^{-2}, 4.11\times10^{-2}, 3.08\times10^{-2}, 2.06\times10^{-2}M)$ with 1%, 2%, and 3% (w/v) montmorillonites were prepared. Applying suitable NMR conditions(the pulse width of 30 ˚ the total delay of 25s), the concentrationof free aquoCd in the supernatant was determined by integration of the Cd peak intensities and the change of chloride in the supernatant. The concentration of free aquo Cd and the change of chloride concentration in the supernatants were determined by integration of the Cd peak intensities and the observed chemical shift data. The result shows that there is decrease of only cadmium concentration and no decrease of chloride concentration. This implies that $CdCl^+$ species are not adsorbed and only $Cd^{2+}$ species are adsorbed on the montmorillonite. To verify this result, the direct method of $^{113}Cd$ solid-state MAS NMR performed with the Cd exchanged montmorillonite. The $^{113}Cd$ chemical shift of -8 ppm obtained in the cadmium exchanged montmorillonite is similar to that observed in cadmium complexes, such as solid $[Cd(H_2O)_6](ClO_4)_2$ with -9 ppm. This result is another evidence to confirm the fact that only $Cd^{2+}$ is adsorbed on montmorillonite.

서지기타정보

서지기타정보
청구기호 {MCH 96022
형태사항 vii, 61 p. : 삽도 ; 26 cm
언어 영어
일반주기 저자명의 한글표기 : 전송희
지도교수의 영문표기 : Hi-Chung Moon
지도교수의 한글표기 : 문희정
학위논문 학위논문(석사) - 한국과학기술원 : 화학과,
서지주기 Reference : p. 52-58
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