Research progress on cobalt-based oxide photocatalysts for degradation of organic pollutants

doi:10.19965/j.cnki.iwt.2023-1191

Abstract

Abstract:

Photocatalysis technology, with the advantages of strong catalytic effect, fast reaction rate, less secondary pollution and low cost, has received a lot of attention from researchers in the area of water pollution control. Cobalt-based oxide is an ideal photocatalyst material because of its low price, abundant reserves and corrosion resistance. In this paper, the preparation methods, morphological structures and catalytic properties of single cobalt-based metal oxides and cobalt-based bimetallic oxides were reviewed, and their photocatalytic degradation mechanisms for organic pollutants were summarized. Aiming at the problems of high photogenerated carrier compounding rate, low utilization rate and poor stability of cobalt-based oxides, a method of modifying cobalt-based oxides to construct multivariate heterojunction composite catalysts was described, which not only promoted the separation and transfer of photogenerated carriers and inhibited the compounding of electron/hole pairs in the photocatalytic reaction, but also effectively controlled the cobalt ions leaching, and the catalytic activity and stability were improved. On this basis, the future research of cobalt-based oxide photocatalysts was proposed.

Key words: cobalt-based oxide, photocatalysis, organic pollutant

摘要：

光催化技术具有催化效应强，反应速率快，不易产生二次污染以及成本低等优势，在水污染控制方面受到了科研工作者的广泛关注。钴基氧化物具有价格低廉、储量丰富、耐腐蚀等优点，是比较理想的光催化剂材料。综述了单一钴金属氧化物、钴基双金属氧化物光催化剂的制备方法、形貌结构及催化性能，总结了其对有机污染物的光催化降解机理。针对钴基氧化物存在的光生载流子复合率高、利用率低且稳定性较差等问题，阐述了对钴基氧化物进行改性构建多元异质结复合催化剂的方法，不仅可以促进光生载流子的分离和转移，抑制光催化反应中电子-空穴对的复合，同时还可以有效控制钴离子浸出，提升其催化活性和稳定性。最后对钴基氧化物光催化剂今后的发展方向进行展望。

关键词: 钴基氧化物, 光催化, 有机污染物

CLC Number:

X703
TQ426

Guoyu LIU, Xiangyu CAO, Jianhua ZHENG. Research progress on cobalt-based oxide photocatalysts for degradation of organic pollutants[J]. Industrial Water Treatment, 2024, 44(11): 27-34.

刘国煜, 曹向禹, 郑建华. 钴基氧化物光催化剂在降解有机污染物中的研究进展[J]. 工业水处理, 2024, 44(11): 27-34.

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https://www.iwt.cn/EN/Y2024/V44/I11/27

Figures/Tables 6

References 44

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催化剂	光源	目标污染物	降解率/%	降解时间/min	参考文献
TiO₂-ZnO-CoO	15 W紫外线灯（λ=253.7 nm）	MB	86.98	120	〔11〕
CoO/g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC	92	80	〔12〕
CoO-xMgO	500 W氙灯（λ>420 nm）	BPA	82.01	60	〔13〕
Co₃O₄/CdS	300 W氙灯（λ>420 nm）	TC	92.6	90	〔16〕
GO/Co₃O₄@TiO₂	100 W氙灯	MO	96.0	300	〔17〕
Co₃O₄/TiO₂ NTAs	紫外线灯	MB	84.9	120	〔18〕
Co₃O₄/g-C₃N₄	125 W高压汞灯	MO	90	70	〔20〕
Co₃O₄/g-C₃N₄	500 W氙灯（λ>420 nm）	Cr（Ⅵ） TC	81.3 92.6	120 120	〔22〕
TiO₂@g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC MO	91.6 97.8	60 60	〔23〕
g-C₃N₄-Co₃O₄-V₂O₅	500 W氙灯	MY MB	93.8 93.2	80 80	〔24〕
CoO/g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC	92	80	〔25〕
Co₃O₄-BiVO₄/g-C₃N₄	可见光	KN-R	99.6%	30	〔26〕

催化剂	光源	目标污染物	降解率/%	降解时间/min	参考文献
TiO₂-ZnO-CoO	15 W紫外线灯（λ=253.7 nm）	MB	86.98	120	〔11〕
CoO/g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC	92	80	〔12〕
CoO-xMgO	500 W氙灯（λ>420 nm）	BPA	82.01	60	〔13〕
Co₃O₄/CdS	300 W氙灯（λ>420 nm）	TC	92.6	90	〔16〕
GO/Co₃O₄@TiO₂	100 W氙灯	MO	96.0	300	〔17〕
Co₃O₄/TiO₂ NTAs	紫外线灯	MB	84.9	120	〔18〕
Co₃O₄/g-C₃N₄	125 W高压汞灯	MO	90	70	〔20〕
Co₃O₄/g-C₃N₄	500 W氙灯（λ>420 nm）	Cr（Ⅵ） TC	81.3 92.6	120 120	〔22〕
TiO₂@g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC MO	91.6 97.8	60 60	〔23〕
g-C₃N₄-Co₃O₄-V₂O₅	500 W氙灯	MY MB	93.8 93.2	80 80	〔24〕
CoO/g-C₃N₄/Co₃O₄	300 W氙灯（λ>420 nm）	TC	92	80	〔25〕
Co₃O₄-BiVO₄/g-C₃N₄	可见光	KN-R	99.6%	30	〔26〕

催化剂	光源	目标污染物	降解率/%	降解时间/min	参考文献
LaCoO₃	300 W氙灯（λ≥400 nm）	TC	89.29	60	〔30〕
LaCoO₃	可见光	兰炭	72.7	120	〔31〕
LaCoO₃	450 W高压汞灯	MG	80.1	120	〔32〕
LaCoO₃/g-C₃N₄	35 W氙灯	MO	89.3	80	〔33〕
LaCoO₃/g-C₃N₄-60%	500 W氙灯（λ>420 nm）	TC	85	300	〔34〕
ZnCo₂O₄	可见光	MB	91.3	180	〔37〕
NiCo₂O₄-Mn_0.05Cd_0.95S	5 W LED灯	MO	90	80	〔38〕
CuCo₂O₄	可见光	MO CR	99.96 99.89	120 120	〔39〕
FeCo₂O₄	可见光	2，4-DCP	70	180	〔40〕
CoAl₂O₄	可见光	RhB	99	120	〔41〕
CoFe₂O₄/g-C₃N₄	300 W氙灯（λ>420 nm）	MB	70	30	〔42〕

催化剂	光源	目标污染物	降解率/%	降解时间/min	参考文献
LaCoO₃	300 W氙灯（λ≥400 nm）	TC	89.29	60	〔30〕
LaCoO₃	可见光	兰炭	72.7	120	〔31〕
LaCoO₃	450 W高压汞灯	MG	80.1	120	〔32〕
LaCoO₃/g-C₃N₄	35 W氙灯	MO	89.3	80	〔33〕
LaCoO₃/g-C₃N₄-60%	500 W氙灯（λ>420 nm）	TC	85	300	〔34〕
ZnCo₂O₄	可见光	MB	91.3	180	〔37〕
NiCo₂O₄-Mn_0.05Cd_0.95S	5 W LED灯	MO	90	80	〔38〕
CuCo₂O₄	可见光	MO CR	99.96 99.89	120 120	〔39〕
FeCo₂O₄	可见光	2，4-DCP	70	180	〔40〕
CoAl₂O₄	可见光	RhB	99	120	〔41〕
CoFe₂O₄/g-C₃N₄	300 W氙灯（λ>420 nm）	MB	70	30	〔42〕

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