Application of layered double hydroxide-biochar composite in wastewater treatment
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摘要: 层状双氢氧化物-生物炭(LDH-BC)复合材料,作为一种新型生物炭基复合纳米材料,在废水处理中展现了优异的污染物吸附和催化降解性能。本篇综述全面系统地总结LDH-BC复合材料的相关研究进展,为日后研究方向提供指导。研究内容综述了LDH-BC复合材料合成方法,改性策略和复合材料在废水处理中的应用及机制。展望部分提出LDH-BC复合材料存在具体组分降解路径不清晰、复合污染物体系应用较少、缺少现场规模试验等问题,接下来应针对以上问题进行深化拓展以推动LDH-BC复合材料的研究与应用。Abstract: Layered double hydroxide-biochar (LDH-BC) composites, novel biochar-based composite nanomaterials that have been shown to be highly effective in adsorbing pollutants and catalyzing degradation in wastewater treatment. This review provides a thorough and organized overview of the current research on LDH-BC composites, which can be used to inform future studies. The research content provides a summary of the synthesis method of LDH-BC composites, the modification strategy, and the application and mechanism of the composites in wastewater treatment. It is suggested in the outlook section that LDH-BC composites have problems inadequate research such as unclear degradation paths of specific components, less application of composite pollutant systems, and lack of field scale tests. The next step is to explore the above shortages of research further in order to promote the research and application of LDH-BC composites.
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图 3 CoFe-LDH/BC与CoFe-LDH@污泥基生物炭(SBC)复合材料在废水中高级氧化的应用与机制[57, 63]
Figure 3. Application and mechanism of CoFe-LDH/BC and CoFe-LDH@SBC composite materials in advanced oxidation of wastewater[57, 63]
ROS—Reactive oxygen species; DMP—Dimethyl phthalate; CIP—Ciprofloxacin; SBC—Sludge based biochar; EPERs—Environmentally persistent free radicals; m/z—Mass-to-charge ratio
表 1 LDH-BC复合材料在废水处理中的应用
Table 1. Application of LDH-BC composites in wastewater treatment
Composite Biochar raw material Pollutant Adsorption capacity/
removal rateSynthetic method Ageing condition Ref. MgAl-LDH/BC Ramie stem Crystal violet 374.686 mg/g Co-precipitation 100℃, 24 h [44] MgAl-LDH/BC Bovine bone Methylene blue 406.47 mg/g Co-precipitation 60℃, 16 h [36] CuAl-LDH@BC Rice husk Congo red 61.35 mg/g Co-precipitation 80℃, 72 h [45] MgAl-LDH/BC Bovine bone Caffeine 26.219 mg/g Co-precipitation 60℃, 15 h [46] Mg/Fe-LDH@BC Rice straw Zn+, Ni+, Pb2+, Cd2+ 141.70 mg/g, 75.59 mg/g,
1264.10 mg/g, 126.30 mg/gCo-precipitation 70℃, 24 h [47] MnMgFe-LDHs/BC Rape stalks Cd2+ 118 mg/g Co-precipitation 60℃, 24 h [48] MgAl-LDH/BC Pinewood sawdust Cr6+, Pb2+ 330.8 mg/g, 591.2 mg/g Hydrothermal 60℃ [49] MnAl-LDH/BC Oil-tea camellia shells Cu2+ 74.07 mg/g Hydrothermal 80℃, 12 h [50] MgAl -LDH/BC Corn straw Cu2+ 94.7 mg/g Co-precipitation 55℃, 12 h [51] MgAl-LDH/BC Coconut shell Cu2+, Pb2+ 38.6 mg/g, 294 mg/g Co-precipitation 60℃, 6 h [52] MgAl-LDH/BC Wheat-straw Nitrate 24.8 mg/g Co-precipitation 70℃, 72 h [53] MgAl-LDH/BC Sugarcane leaves Phosphates 81.83 mg/g Co-precipitation 105℃, 24 h [20] MgAl-LDH/BC Date-palm Phosphates, nitrates 177.97 mg/g, 28.06 mg/g Co-precipitation 60℃, 48 h [14] MgAl-LDH/BC Cotton wood Phosphates 410 mg/g Co-precipitation 80℃, 72 h [54] Ni/Fe-LDH/BC Loblolly pine As5+ 4.38 mg/g Co-precipitation 80℃, 12 h [55] FeAl-LDH@BC Rice husk Phenol 85.28% Hydrothermal — [56] CoFe-LDH@SBC Municipal sludge Ciprofloxacin 71% Co-precipitation 80℃, 24 h [57] CuCo-LDH/BC Pine needles Ciprofloxacin 84.7% Co-precipitation 65℃, 24 h [58] Zn-Co-LDH@BC Wheat husks and paper sludge Jimifloxacin 92.7% Hydrothermal 90℃, 24 h [59] ZnO/ZnFe-LDH@BC Rice husks Tetracycline 87.7% Hydrothermal 100℃, 4 h [60] Notes: CoFe-LDH@SBC—Sludge biochar loaded with layered double hydroxides. -
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