Advances in magnetically recyclable remediators for elemental mercury degradation in coal combustion flue gas,Journal of Materials Chemistry A

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Advances in magnetically recyclable remediators for elemental mercury degradation in coal combustion flue gas
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-25 , DOI: 10.1039/d0ta06311h
Zequn Yang _{1,

2,

3,

4,

5} , Jianping Yang _{1,

2,

3,

4} , Hailong Li _{1,

2,

3,

4} , Wenqi Qu _{1,

2,

3,

4} , Lijian Leng _{1,

2,

3,

4} , Jiexia Zhao _{1,

2,

3,

4} , Yong Feng _{4,

6,

7,

8} , Zhengyong Xu _{3,

4,

9} , Hui Liu _{2,

3,

4,

10} , Kaimin Shih _{4,

5,

11,

12}

Affiliation

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.

中文翻译：

磁可再生修复剂在燃煤烟气中汞降解中的研究进展

煤炭-能源转化过程被公认为全球范围内最大的已知单质汞（Hg ⁰）排放源之一。随着《水am公约》的实施，合理设计适当的补救措施，以解决Hg ^0的降解和从燃煤烟气（CCFG）中回收的问题。为了实现这些目标，磁性材料具有独特的潜力，作为磁性修复剂，不仅显示出高的Hg ⁰降解效率，而且还通过使用外部磁场实现了修复剂的循环利用。有了这些承诺，磁性Hg ⁰修复剂在过去十年中一直在发展，并处于革命阶段。在本次审查中，用于Hg ⁰的磁性修复剂CCFG的降解可分为两大类，即原始磁性材料（RMM）和功能化磁性材料（FMM），其中，这些FMM是通过（1）添加有利的载体，（2）加载活性成分，（3）加入活性配体，（4）硫化/硒化，和/或（5）通过基于RMM的外部高能场活化。在这些磁修复剂中，RMM通常表现出有限的Hg ⁰降解性能。因此，总结了修改方法的功能，以阐述其内在作用。此外，影响汞⁰的影响因素和涉及机制回顾了不同磁补救剂的老化问题，以此作为指导合理设计过程的基础。最后，从宏观和微观的角度提出了研究空白，以阐明进一步的研究方向。

更新日期：2020-09-22

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