title: Spectroscopic study on biological mackinawite (FeS) synthesized by ferric reducing bacteria (FRB) and sulfate reducing bacteria (SRB): Implications for in-situ remediation of acid mine drainage.
abstract: Mackinawite (FeS), widespread in low temperature aquatic environments, is generally considered to be the first Fe sulfide formed in sedimentary environments which has shown effective immobilization of heavy metals and toxic oxyanions through various sorption reactions. The spectroscopic study researches on mackinawite formed by FRB and SRB and its environmental implication for in-situ remediation of acid mine drainage where contains large amounts of Fe3+and SO42-. The XRD result of biologically synthetic particles shows that these particles are mainly composed of mackinawite (FeS0.9). The Raman peaks observed at 208, 256, 282, 298cm-1are attributed to FeS stretching vibrations of mackinawite. The Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR) reveals that the diagnostic bands of low intensity for these FeS particles occur at 412-425cm-1and 607-622cm-1, which are assigned to the stretching vibrations of SS and FeS bonds. The Raman and IR vibrations from organic components both confirm that these particles are biogenic origin. The IR spectra of biologically synthesized mackinawite for different aging times show that the nano-sized particles mackinwate will be completely oxidized within 10h. All these findings have good implications for in-situ remediation of acid mine drainage.
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China; School of Environment and Resource, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China. Electronic address: fqdong@swust.edu.cn.
authors.forename: Faqin
authors.initials: F
authors.lastname: Dong
mesh_terms: D041801:Acidiphilium / Q000378:metabolism*; D000332:Aerobiosis; D001673:Biodegradation, Environmental; D003460:Crystallization; D003901:Desulfovibrio / Q000378:metabolism*; D005296:Ferrous Compounds / Q000737:chemistry* / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D008906:Mining; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013431:Sulfates / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism; D014961:X-Ray Diffraction
chemical_list: D005296:Ferrous Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; C022597:ferrous sulfide
keywords: Biological synthesis; Infrared spectroscopy; Mackinawite; Oxidization process; Raman spectroscopy