期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 431, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.128584
关键词
Biochar; Co-doping; Metal; Heteroatoms; Adsorption; Catalytic degradation
资金
- National Natural Science Foundation of China [51979104, 42071122]
- Natural Science Founda-tion of Hunan Province, China [2020JJ5019]
- Science and Technology Plan Project of Changsha City [kq2009085, kq2009086]
- Sci-ence and Technology Innovation Program of Hunan Province [2020RC5008]
The potential risk of various contaminants in water has attracted public attention recently. Metal and heteroatom co-doped biochar composites (MHBCs), with more active sites and higher affinity for contaminants compared to single-doped biochar, have gained significant interest. This study provides a comprehensive review of MHBCs in wastewater decontamination, including fabrication methods, applications as adsorbents and catalysts, removal mechanisms, and influencing factors. Future challenges of MHBCs are also proposed.
The potential risk of various contaminants in water has recently attracted public attention. Biochars and modified biochars have been widely developed for environmental remediation. Metal and heteroatom co-doped biochar composites (MHBCs) quickly caught the interest of researchers with more active sites and higher affinity for contaminants compared to single-doped biochar by metal or heteroatoms. This study provides a comprehensive review of MHBCs in wastewater decontamination. Firstly, the main fabrication methods of MHBCs were external doping and internal doping, with external doping being the most common. Secondly, the applications of MHBCs as adsorbents and catalysts in water treatment were introduced emphatically, which mainly included the removal of metals, antibiotics, dyes, pesticides, phenols, and other organic contaminants. Thirdly, the removal mechanisms of contaminants by MHBCs were deeply discussed in adsorption, oxidation and reduction, and degradation. Furthermore, the influencing factors for the removal of contaminants by MHBCs were also summarized, including the physicochemical properties of MHBCs, and environmental variables of pH and co-existing substance. Finally, futural challenges of MHBCs are proposed in the leaching toxicity of metal from MHBCs, the choice of heteroatoms on the fabrication for MHBCs, and the application in the composite system and soil remediation.
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