TY - JOUR
T1 - Sustainable removal of Hg(II) by sulfur-modified pine-needle biochar
AU - Jeon, Cheolho
AU - Solis, Kurt Louis
AU - An, Ha Rim
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.
KW - Engineered biochar
KW - Potentially toxic element
KW - Remediation
KW - Sulfur functionalization
KW - Wastewater
UR - http://www.scopus.com/inward/record.url?scp=85077928985&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.122048
DO - 10.1016/j.jhazmat.2020.122048
M3 - Article
C2 - 31955026
AN - SCOPUS:85077928985
SN - 0304-3894
VL - 388
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 122048
ER -