Removal of dissolved Zn(II) using coal mine drainage sludge: Implications for acidic wastewater treatment
- Authors
- Cui, Mingcan; Jang, Min; Cannon, Fred S.; Na, Seunmin; Khim, Jeehyeong; Park, Jae Kwang
- Issue Date
- 15-2월-2013
- Publisher
- ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
- Keywords
- Zeta potential; Coal mine drainage sludge; Goethite; Hematite; Complexation; Fourier transform infrared spectroscopy
- Citation
- JOURNAL OF ENVIRONMENTAL MANAGEMENT, v.116, pp.107 - 112
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ENVIRONMENTAL MANAGEMENT
- Volume
- 116
- Start Page
- 107
- End Page
- 112
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/103956
- DOI
- 10.1016/j.jenvman.2012.12.013
- ISSN
- 0301-4797
- Abstract
- The mechanism for the removal of Zn(II) by using coal mine drainage sludge (CMDS) was investigated by spectroscopic analysis and observations of batch tests using model materials. Zeta potential analysis showed that CMDS25 (dried at 25 degrees C) and CMDS550 (dried at 550 degrees C) had a much lower isoelectric point of pH (pH(IEp)) than either goethite or calcite, which are the main constituents of CMDS. This indicates that the negatively charged anion (sulfate) was incorporated into the structural networks and adsorbed on the surface of CMDS via outer-sphere complexation. The removal of Zn(II) by CMDS was thought to be primarily caused by sulfate-complexed iron (oxy)hydroxide and calcite. In particular, the electrostatic attraction of the negatively charged functional group, FeOH-SO42-, to the dissolved Zn(II) could provide high removal efficiencies over a wide pH range. Thermodynamic modeling and Fourier transform infrared spectroscopy (FT-IR) demonstrated that ZnSO4 is the dominant species in the pH range 3-7 as the sulfate complexes with the hydroxyl groups, whereas the precipitation of Zn(II) as ZnCO3 or Zn-5(CO3)(2) (OH)(6) through the dissolution of calcite is the dominant mechanism in the pH range 7-9.6. (C) 2012 Elsevier Ltd. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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