Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar
- Authors
- Jeon, Cheolho; Solis, Kurt Louis; An, Ha-Rim; Hong, Yongseok; Igalavithana, Avanthi Deshani; Ok, Yong Sik
- Issue Date
- 15-Apr-2020
- Publisher
- ELSEVIER
- Keywords
- Potentially toxic element; Remediation; Sulfur functionalization; Wastewater; Engineered biochar
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.388
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 388
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56618
- DOI
- 10.1016/j.jhazmat.2020.122048
- ISSN
- 0304-3894
- Abstract
- Sulfur-modified pine-needle biochar (BC-S) was produced for the removal of Hg(II) in aqueous media via postpyrolysis S stream exposure. Fourier-transform infrared spectroscopy, elemental analysis, and X-ray photoelectron spectroscopy confirmed the addition of S(0) groups on the surface of BC-S. Hg(II) adsorption on BC-S was best described by the Freundlich isotherm with a K-F of 21.0 mg L g(-1) and a pseudo-second-order adsorption kinetics model with a rate of 0.35 g mg(-1) min(-1). Hg(II) removal on BC-S was found to be an endothermic process that relied on C-Hg and S-Hg interactions rather than reduction by S(0) groups. The adsorption increased with increasing solution pH and decreased with increasing dissolved organic matter concentration, but was unaffected by increasing salt concentrations. BC-S showed a maximum of 3 % S leaching in aqueous media after 28-d exposure time, and exposure to aqueous media did not convert Hg(II) to elemental Hg. Overall, BC-S exhibited superior Hg(II) removal performance over unmodified BC, thus having potential applications in natural water and wastewater treatment with no significant threat of secondary pollution.
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Collections - Graduate School > Department of Environmental Engineering > 1. Journal Articles
- College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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