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Solvothermal Synthesis of MIL-96 and UiO-66-NH2 on Atomic Layer Deposited Metal Oxide Coatings on Fiber Mats
Published on: June 13, 2018
UiO-66 and its Br-modified derivates for elemental mercury removal
Xiao Zhang1, Boxiong Shen2, Sheaowen Zhu1
1College of Environmental Science and Engineering, Nankai University, Tianjin, China.
Phenyl bromine-appended metal-organic frameworks (Br-MOFs) efficiently remove elemental mercury (Hg0) from flue gas. These novel Br-MOFs demonstrate high stability and low environmental risk compared to traditional adsorbents.
Area of Science:
- Materials Science
- Environmental Chemistry
- Chemical Engineering
Background:
- Elemental mercury (Hg0) is a toxic pollutant emitted from industrial processes, necessitating effective removal strategies.
- Conventional adsorbents often suffer from instability and environmental concerns, such as bromine leaching.
Purpose of the Study:
- To synthesize and evaluate phenyl bromine-appended metal-organic frameworks (Br-MOFs) for elemental mercury (Hg0) removal.
- To assess the stability of bromine on the Br-MOFs during Hg0 adsorption.
- To compare the performance of Br-MOFs with un-functionalized MOFs and bromine-impregnated activated carbon.
Main Methods:
- Synthesis of phenyl bromine-appended metal-organic frameworks (Br-MOFs).
- Characterization using Powder X-ray Diffraction (PXRD), nitrogen adsorption, Thermogravimetric Analysis (TGA), and X-ray Photoelectron Spectroscopy (XPS).
- Hg0 removal efficiency testing under simulated flue gas conditions at elevated temperatures, including the presence of SO2 and steam.
Main Results:
- The optimal Br-MOF achieved over 99% Hg0 removal efficiency for 48 hours at 200°C.
- Br-MOFs maintained crystalline integrity and demonstrated high bromine stability, preventing leaching.
- Performance of Br-MOFs surpassed un-functionalized MOFs (59.8% removal) and bromine-impregnated activated carbon (91.2% removal within 5h).
- Enhanced Hg0 removal was observed in the presence of SO2, but efficiency decreased with steam.
Conclusions:
- Phenyl bromine-appended MOFs are effective and stable adsorbents for elemental mercury removal from flue gas.
- Br-MOFs offer a promising low-environmental-risk alternative to conventional mercury adsorbents.
- The stability and high efficiency of Br-MOFs highlight their potential for industrial applications in pollution control.
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