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

Autor: Zhang X; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China; School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China., Liang J; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China., Sun Y; College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China., Zhang F; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China., Li C; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China., Hu C; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China., Lyu L; Institute of Environmental Research at Greater Bay Area, and School of Environmental Science and Engineering, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China. Electronic address: lyulai@gzhu.edu.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2020 Sep 15; Vol. 576, pp. 59-67. Date of Electronic Publication: 2020 May 05.
DOI: 10.1016/j.jcis.2020.05.007
Abstrakt: A novel heterogeneous Co-containing Fenton-like catalyst consisting of mesoporous reduction state cobalt (RSCo)-doped silica (SiO 2 ) nanospheres (mp-RSCo-SiO 2 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 Co 3 O 4 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 Co 2+ , were found to be generated in the SiO 2 framework through forming CoOSi bonds. During the Fenton-like reaction, the electron donation effect of organic pollutants was successfully realized through the interaction of "Pollutants → Co 2+/0 -SiO 2 ". The obtained electrons from pollutants were transferred to the catalyst surface and captured by H 2 O 2 , resulting in the generation of hydroxyl radicals (OH). 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 radicals. This work provided a new perspective on the effective utilization of the electrons of pollutants and the improvement of Fenton reaction efficiency.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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