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11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Selenium Functionalized Metal-Organic Framework MIL-101 for Efficient and Permanent Sequestration of Mercury
Jianping Yang1, Wenbing Zhu1, Wenqi Qu1
1School of Energy Science and Engineering , Central South University , Changsha 410083 , China.
Environmental Science & Technology
|January 24, 2019
Summary
Selenium functionalized MIL-101 (Se/MIL-101) effectively removes mercury from coal power plants. This advanced material shows superior adsorption capacity and rate, ensuring stable mercury sequestration with minimal re-emission.
Area of Science:
- Environmental Chemistry
- Materials Science
- Chemical Engineering
Background:
- Mercury emissions from coal-fired power plants pose significant public health and environmental risks.
- Effective mercury abatement technologies are crucial for regulatory compliance and ecological protection.
- Current methods often struggle with efficiency, stability, and complete mercury sequestration.
Purpose of the Study:
- To develop a novel material for efficient mercury removal from coal-fired power plant emissions.
- To evaluate the mercury adsorption capacity, rate, and stability of selenium functionalized MIL-101 (Se/MIL-101).
- To assess the potential for permanent mercury sequestration and application in flue gas treatment and wastewater remediation.
Main Methods:
- Synthesis of selenium functionalized metal-organic framework MIL-101 (Se/MIL-101).
- Characterization of Se/MIL-101 for mercury adsorption performance, including capacity and kinetics.
- Testing of Se/MIL-101 stability under simulated flue gas conditions (SO2, NO, H2O).
- Evaluation of mercury transformation into mercury selenide (HgSe) and immobilization in gypsum and desulfurization effluent.
Main Results:
- Se/MIL-101 demonstrated a high mercury adsorption capacity (148.19 mg·g⁻¹), significantly outperforming commercial activated carbons.
- The initial mercury adsorption rate was exceptionally high (44.8 μg·g⁻¹·min⁻¹), exceeding existing sorbents.
- Se/MIL-101 maintained stability in simulated flue gas and converted gaseous mercury (Hg⁰) to stable mercury selenide (HgSe).
- Mercury-laden Se/MIL-101 effectively immobilized mercury in gypsum and removed mercury ions from effluent to undetectable levels (<0.0035 μg·L⁻¹).
Conclusions:
- Se/MIL-101 is a highly effective material for mercury removal from coal-fired power plants.
- Its superior adsorption capacity, rapid kinetics, and stable sequestration offer a promising solution for mercury pollution control.
- The material facilitates permanent mercury sequestration, addressing critical environmental and health concerns.
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