Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 424, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127612
Keywords
Layered double hydroxides (LDHs) catalysts; Persulfate activation mechanism; Advanced oxidation processes (AOPs); Environmental remediation
Categories
Funding
- National Natural Science Foundation of China [52100181, 51979103, 51679085, 51521006, 51508177]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- China Postdoctoral Science Foundation [2021T140192, 2021M690054]
- Funds of Hunan Science and Technology Innovation Project [2018RS3115, 2020RC5012]
- Key Research and Development Project of Hunan Province of China [2017SK2241]
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This work provides a comprehensive summary of the application of LDHs and their composites in persulfate-based advanced oxidation processes (persulfate-AOPs), covering their structural characteristics, classification, catalytic mechanisms, and performance in contaminant degradation.
Recently, persulfate-based advanced oxidation processes (persulfate-AOPs) are booming rapidly due to their promising potential in treating refractory contaminants. As a type of popular two-dimensional material, layered double hydroxides (LDHs) are widely used in energy conversion, medicine, environment remediation and other fields for the advantages of high specific surface area (SSA), good tunability, biocompatibility and facile fabrication. These excellent physicochemical characteristics may enable LDH-based materials to be promising catalysts in persulfate-AOPs. In this work, we make a summary of LDHs and their composites in persulfate-AOPs from different aspects. Firstly, we introduce different structure and important properties of LDH-based materials briefly. Secondly, various LDH-based materials are classified according to the type of foreign materials (metal or carbonaceous materials, mainly). Latterly, we discuss the mechanisms of persulfate activation (including radical pathway and nonradical pathway) by these catalysts in detail, which involve (i) bimetallic synergism for radical generation, (ii) the role of carbonaceous materials in radical generation, (iii) singlet oxygen (1O2) production and several special nonradical mechanisms. In addition, the catalytic performance of LDH-based catalysts for contaminants are also summarized. Finally, challenges and future prospects of LDH-based composites in environmental remediation are proposed. We expect this review could bring new insights for the development of LDHbased catalyst and exploration of reaction mechanism.
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