Issue 36, 2020

Advances in magnetically recyclable remediators for elemental mercury degradation in coal combustion flue gas

Abstract

The coal-energy conversion process is recognized as one of the largest single known sources for elemental mercury (Hg0) emission worldwide. With the implementation of the Minamata Convention, the rational design of proper remediators for Hg0 degradation and recovery from coal combustion flue gas (CCFG) is of great urgency. To achieve these goals, magnetic materials hold unique potentials as magnetic remediators not only exhibiting high Hg0 degradation efficiencies, but also achieving remediator recycling by the use of an external magnetic field. With these promises, magnetic Hg0 remediators have been evolving in the last ten years and undergoing a revolutionary phase. In this review, the magnetic remediators used for Hg0 degradation from CCFG are categorized into two groups, i.e., raw magnetic materials (RMMs) and functionalized magnetic materials (FMMs), among which the FMMs are obtained by (1) adding favorable supports, (2) loading active components, (3) incorporating active ligands, (4) sulfuring/selenizing, and/or (5) activating by external energetic field based on the RMMs. Among these magnetic remediators, RMMs generally exhibited limited Hg0 degradation performances. Therefore, the functions of modification methods are summarized to elaborate on their intrinsic roles. Moreover, the influential factors and involved mechanisms accounting for Hg0 degradation over different magnetic remediators are reviewed as fundamentals to guide the rational design process. Finally, research gaps are proposed from both macrocosmic and microcosmic visions to shed light on further research directions.

Graphical abstract: Advances in magnetically recyclable remediators for elemental mercury degradation in coal combustion flue gas

Article information

Article type
Review Article
Submitted
27 Jun 2020
Accepted
25 Aug 2020
First published
25 Aug 2020

J. Mater. Chem. A, 2020,8, 18624-18650

Advances in magnetically recyclable remediators for elemental mercury degradation in coal combustion flue gas

Z. Yang, J. Yang, H. Li, W. Qu, L. Leng, J. Zhao, Y. Feng, Z. Xu, H. Liu and K. Shih, J. Mater. Chem. A, 2020, 8, 18624 DOI: 10.1039/D0TA06311H

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