Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar

Cheolho Jeon; Kurt Louis Solis; Ha Rim An; Yongseok Hong; Avanthi Deshani Igalavithana; Yong Sik Ok

doi:10.1016/j.jhazmat.2020.122048

Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar

Cheolho Jeon, Kurt Louis Solis, Ha Rim An, Yongseok Hong, Avanthi Deshani Igalavithana, Yong Sik Ok

Research output: Contribution to journal › Article › peer-review

90 Citations (Scopus)

Abstract

Sulfur-modified pine-needle biochar (BC–S) was produced for the removal of Hg(II) in aqueous media via post-pyrolysis 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.

Original language	English
Article number	122048
Journal	Journal of hazardous materials
Volume	388
DOIs	https://doi.org/10.1016/j.jhazmat.2020.122048
Publication status	Published - 2020 Apr 15

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) in the Ministry of Science, ICT & Future Planning ( 2018R1D1A1B07049757 ) and by the Korea Institute of Energy Technology Evaluation and Planning ( 20193410100050 ) in Ministry of Trade, Industry and Energy in Korea. Appendix A

Publisher Copyright:
© 2020

Keywords

Engineered biochar
Potentially toxic element
Remediation
Sulfur functionalization
Wastewater

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution
Health, Toxicology and Mutagenesis

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10.1016/j.jhazmat.2020.122048

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title = "Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar",

abstract = "Sulfur-modified pine-needle biochar (BC–S) was produced for the removal of Hg(II) in aqueous media via post-pyrolysis 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 KF 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.",

keywords = "Engineered biochar, Potentially toxic element, Remediation, Sulfur functionalization, Wastewater",

author = "Cheolho Jeon and Solis, {Kurt Louis} and An, {Ha Rim} and Yongseok Hong and Igalavithana, {Avanthi Deshani} and Ok, {Yong Sik}",

note = "Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) in the Ministry of Science, ICT & Future Planning ( 2018R1D1A1B07049757 ) and by the Korea Institute of Energy Technology Evaluation and Planning ( 20193410100050 ) in Ministry of Trade, Industry and Energy in Korea. Appendix A Publisher Copyright: {\textcopyright} 2020",

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AU - Jeon, Cheolho

AU - Solis, Kurt Louis

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AU - Hong, Yongseok

AU - Igalavithana, Avanthi Deshani

AU - Ok, Yong Sik

N1 - Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) in the Ministry of Science, ICT & Future Planning ( 2018R1D1A1B07049757 ) and by the Korea Institute of Energy Technology Evaluation and Planning ( 20193410100050 ) in Ministry of Trade, Industry and Energy in Korea. Appendix A Publisher Copyright: © 2020

PY - 2020/4/15

Y1 - 2020/4/15

N2 - Sulfur-modified pine-needle biochar (BC–S) was produced for the removal of Hg(II) in aqueous media via post-pyrolysis 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 KF 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.

AB - Sulfur-modified pine-needle biochar (BC–S) was produced for the removal of Hg(II) in aqueous media via post-pyrolysis 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 KF 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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Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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