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Coordinatively Unsaturated Selenides over CuFeSe2 toward Highly Efficient Mercury Immobilization
Hailong Li1, Hongxiao Zu1, Qin Li1
1School of Energy Science and Engineering, Central South University, Changsha 410083, China.
Environmental Science & Technology
|December 21, 2021
Summary
Copper iron diselenide (CuFeSe2) significantly enhances mercury (Hg0) removal rates by optimizing unsaturated selenide ligands. This novel approach boosts adsorption efficiency for industrial applications like coal combustion flue gas cleanup.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Metal selenides show potential for mercury (Hg0) remediation.
- Low adsorption rates hinder practical application of current metal selenides.
Purpose of the Study:
- To enhance the Hg0 adsorption rate of metal selenides by adjusting selenide saturation.
- To develop an efficient Hg0 remediator for coal combustion flue gas.
Main Methods:
- Utilized copper iron diselenide (CuFeSe2) for its surface reconstruction properties.
- Investigated Hg0 adsorption rates and performance under flue gas conditions.
- Employed density functional theory (DFT) for mechanistic interpretation.
Main Results:
- Achieved a high Hg0 adsorption rate of 900.71 μg·g-1·min-1 with CuFeSe2.
- Demonstrated superior performance compared to existing metal selenides.
- Confirmed the crucial role of unsaturated selenides in Hg0 adsorption via DFT.
Conclusions:
- Optimizing selenide saturation in CuFeSe2 dramatically increases Hg0 adsorption rates.
- CuFeSe2 exhibits excellent resistance to flue gas interference and temperature fluctuations.
- This strategy facilitates the rational design of selenide-based sorbents for environmental remediation.
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