Recyclable MnCl2-Fe2O3@CNT as Sulfur and Water-Resistant Sorbent for Gaseous Elemental Mercury Removal from Coal Combustion Flue Gas
Zhuo Liu, Yuchi Chen, Hao Rong, Cui Jie, Xiyan Peng, Honghu Li
TL;DR
A new material made from carbon nanotubes is developed to efficiently and durably remove mercury from coal plant emissions, even in the presence of sulfur and water.
Contribution
A novel MnCl2-Fe2O3@CNT composite is developed with enhanced resistance to sulfur dioxide and water for mercury removal.
Findings
MnCl2(10)FeCNT achieves 25.06 mg·g−1 mercury removal capacity.
The material retains >90% efficiency after five regeneration cycles.
Active chlorine and oxygen species are key to mercury capture as HgCl2.
Abstract
Mercury poses serious hazards to human health. Carbon nanotube (CNT) is a potential material for elemental mercury (Hg0) adsorption removal, however, it shows susceptibility to SO2 and H2O. Herein, CNT is first decorated with Fe2O3 then modified with MnCl2 (MnCl2-Fe2O3@CNT) to enhance SO2 and H2O resistance. The Hg0 removal performance and physical–chemical properties of samples are comprehensively studied. MnCl2(10)FeCNT (10 wt% MnCl2 content) has a high specific surface area (775.76 m2·g−1) and abundant active chlorine (35.01% Cl* content) as well as oxygen species (84.23% Oα content), which endows it with excellent Hg0 adsorption capacity (25.06 mg·g−1) and good SO2 and H2O resistance. Additionally, the superparamagnetic property can enable MnCl2(10)FeCNT to be conveniently recycled. After fifth regeneration, MnCl2(10)FeCNT can still achieve >90% Hg0 removal. The abundant active…
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Taxonomy
TopicsMercury impact and mitigation studies · Air Quality and Health Impacts · Industrial Gas Emission Control