Mesoporous reduction state cobalt species-doped silica nanospheres: An efficient Fenton-like catalyst for dual-pathway degradation of organic pollutants

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:576

Article

Zhang, Xuejian^1,2,3  Liang, Junrong^1,2  Sun, Yong⁴  Zhang, Fagen^1,2  Li, Chenwei^1,2  Hu, Chun^1,2  Lyu, Lai^1,2 

[1] Guangzhou Univ, Minist Educ, Inst Environm Res Greater Bay Area, Guangzhou 510006, Peoples R China

[2] Guangzhou Univ, Sch Environm Sci & Engn, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Peoples R China

[3] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510006, Peoples R China

[4] Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Peoples R China

关键词: Heterogeneous Fenton;    Water purification;    Co-containing catalyst;    Dual-pathway degradation;    Electron donation of pollutants;   

DOI  :  10.1016/j.jcis.2020.05.007

来源: Elsevier

【 摘 要 】

A novel heterogeneous Co-containing Fenton-like catalyst consisting of mesoporous reduction state cobalt (RSCo)-doped silica (SiO2) nanospheres (mp-RSCo-SiO2 NSs) was prepared by an enhanced hydrothermal process. The catalyst exhibited very high activity and stability for a series of refractory pollutant degradation in a very wide pH range of 3.1-10.9. The Fenton-like reaction rate constant of this Co-containing catalyst was approximately 290 times higher than that of Co3O4 for pollutant degradation under the neutral and mild conditions. Based on the characterization, the catalyst possessed a porous nanosphere morphology, and the reduction state cobalt species, including nano-zero-valent cobalt (nZVCo) and Co2+, were found to be generated in the SiO2 framework through forming Co-O-Si bonds. During the Fenton-like reaction, the electron donation effect of organic pollutants was successfully realized through the interaction of Pollutants -> Co2+/0-SiO2. The obtained electrons from pollutants were transferred to the catalyst surface and captured by H2O2, resulting in the generation of hydroxyl radicals ((OH)-O-center dot). Therefore, a dual-pathway degradation of the pollutants was realized: (I) oxidation and degradation as the electron donors for the system and (II) attacking and destruction by (OH)-O-center dot radicals. This work provided a new perspective on the effective utilization of the electrons of pollutants and the improvement of Fenton reaction efficiency. (C) 2020 Elsevier Inc. All rights reserved.

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