Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.107045
Keywords
Industrial waste; Raffinate slag; Sulfur-containing carbon-based sorbents; Hg-0 capture; Coal-fired flue gas
Categories
Funding
- Fundation of CHN ENERGY 2030 Project [GJNY2030XDXM-19-17]
- National Natural Science Foundation of China [U1710107]
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The study demonstrated that sorbents prepared from industrial waste CLR-RS showed excellent Hg-0 removal performance under N-2 + O-2 and N-2 + O-2 + SO2 + NO + H2O conditions, suggesting their potential application for industrial Hg-0 capture. Sustainable utilization could be achieved through recycling RS.
Capture of elemental mercury (Hg-0) attracts global attention because of its toxicity and bioaccumulation. Carbon-based sorbents are extensively studied due to the high porosity that can increase Hg-0 adsorption ability. In this study, the RS-based sorbents were prepared from sulfur-containing coal liquefaction residue raffinate slag (CLR-RS), an industrial waste, by CH3COOK activation. The N-2 adsorption, XRD, SEM, XRF, Hg-TPD, and XPS techniques were used to study the physicochemical properties of sorbents. The sorbent that was prepared at 850 degrees C from the blend of CH3COOK/RS at 3:5 (by mass) exhibited excellent Hg-0 removal performance under N-2 + O-2, and an improved performance was observed under N-2 + O-2 + SO2 + NO + H2O. The Hg-TPD and XPS analyses revealed that HgS and HgO were formed on used RS-based sorbents. O-2 in flue gas could improve the ability in capturing Hg-0 by promoting the formation of HgS and HgO. The findings have suggested that the prepared sorbents based on CLR-RS could be potentially applied for industrial Hg-0 capture, and the sustainable utilization could be realized by recycling RS.
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