본문 바로가기
HOME> 논문 > 논문 검색상세

논문 상세정보

Applied geochemistry : journal of the International Association of Geochemistry and Cosmochemistry v.91, 2018년, pp.14 - 22   SCI SCIE SCOPUS
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Formation and characterization of ternary (Na, NH4, H3O)-jarosites produced from Acidithiobacillus ferrooxidans cultures

Jones, F. Sandy (School of Environment and Natural Resources, Ohio State University, Columbus, OH 43210, USA ) ; Bigham, Jerry M. (School of Environment and Natural Resources, Ohio State University, Columbus, OH 43210, USA ) ; Gramp, Jonathan P. (Department of Microbiology, Ohio State University, Columbus, OH 43210, USA ) ; Tuovinen, Olli H. (Department of Microbiology, Ohio State University, Columbus, OH 43210, USA ) ;
  • 초록  

    Abstract The purpose of this study was to characterize a series of (Na, NH 4 , H 3 O)-jarosites produced with various combinations of NH 4 + + Na + in cultures of Acidithiobacillus ferrooxidans that simulated acid solutions from bioleaching systems. The solution concentrations utilized were 6.1, 80, 160 and 320 mM for NH 4 + and 0, 50, 100, 250 and 500 mM for Na + as their respective sulfates. Media at pH 2.2 were inoculated with iron-oxidizing A. ferrooxidans and incubated in shake flasks at 22 ± 2 °C. As the bacteria oxidized ferrous sulfate, ferric iron hydrolyzed and precipitated as schwertmannite (idealized formula Fe 8 O 8 (OH) 6 (SO 4 ).nH 2 O) and/or as solid solution jarosites [(Na, NH 4 , H 3 O)-Fe 3 (SO 4 ) 2 (OH) 6 )] depending on the relative and absolute concentrations of NH 4 + and Na + . The precipitates were characterized by elemental analysis, X-ray diffraction, specific surface area, and Munsell color. Schwertmannite was the dominant mineral product at low combinations of Na + (≤50 mM) and NH 4 + (≤80 mM) in the media after 2 weeks of aging. At higher single or combined concentrations and with aging for 6 and 11 weeks, the formation of yellowish, solid solution jarosites was enhanced. Precipitation of jarosite-group minerals was favored by NH 4 + relative to Na + . Color (Munsell hue) was a useful tool for assessing sample mineralogy after extended aging, but the presence of abundant, poorly crystalline schwertmannite tended to mask the color of admixed jarosite-group minerals after only 2 weeks of contact with the culture media. The purest samples of jarosite-type minerals had specific surface areas 2 /g. Unit cell edge lengths and cell volume calculations from powder XRD data indicated that the jarositic phases produced were ternary (Na, NH 4 , H 3 O)-solid solutions. Most products also appeared to be deficient in structural Fe, especially at low NH 4 contents. Thus, ferric iron precipitation from the simulated bioleaching systems yielded solid solutions of jarosites with chemical compositions that were dependent on the relative concentrations of Na + and NH 4 + in the synthesis media. No phase separations involving discrete, end-member Na-, NH 4 -, or H 3 O-jarosites were detected. Highlights Ternary (Na, NH 4 , H 3 O) jarosites were precipitated in cultures of A. ferrooxidans . H 3 O substitution for structural Na/NH 4 occurred in all samples. Crystallization of jarosites was enhanced by NH 4 + relative to Na + and by aging. Schwertmannite was formed at low NH 4 + (≤80 mM) and all Na + concentrations. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Acidithiobacillus ferrooxidans .   Iron oxidizing bacteria .   Jarosites .   Natrojarosite .   Schwertmannite.  

 활용도 분석

  • 상세보기

    amChart 영역
  • 원문보기

    amChart 영역

원문보기

무료다운로드
  • 원문이 없습니다.

유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.

원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.

NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.

이 논문과 함께 출판된 논문 + 더보기