Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 647, Issue -, Pages 587-596Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.08.022
Keywords
Fenton-like catalyst; Flexible property; Recovery; CuO nanowires; Organic pollutants
Categories
Funding
- CAST [2017QNRC001]
- National Natural Science Foundation of China [51402116]
- Fundamental Research Funds for the Central Universities [2018KFYYXJJ028]
- Research Project of State Key Laboratory of Materials Processing and Die & Mould Technology
- Analytical and Testing Center of Huazhong University of Science and Technology
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Free-standing and flexible Cu@CuO nanowires (NWs) mesh as an easily recycled Fenton-like catalyst is developed for the first time. Dense CuO nanowire arrays were uniformly grown on a copper mesh surface simply by wet etching accompanied with thermal dehydration. These dense CuO NWs provide a large specific area and therefore guarantee excellent catalytic performance toward the degradation of rhodamine B (RhB). With a k-value of 0.23min(-1), such a Cu@CuONWsmesh is able to degrade 100% RhB in only 16 min. This Fenton-like catalyst is also appropriate for degrading other organic dyes, including crystal violet, methylene blue, and rhodamine 6G. Unlike the conventional Fenton catalyst implemented at a pH value around 3, the Cu@CuO NWs mesh could adapt to a wide pH range from 2.1 to 12.0. More intriguingly, the Cu@CuO NWsmeshwith excellent flexibility could be easily recycled after catalysis, which is a significant advance compared to the previously reported Fenton catalysts in the form of powders or nanoparticles. In addition, the recycling performance of this Cu@CuO NWs mesh was also assessed. On the basis of electron spin resonance (ESR) results, center dot O2- rather than center dot OH is the main active species for the dye degradation by the Cu@CuO NWs mesh. With a marvelous combination of excellent flexibility, wide pH adaptation, and high efficiency, this easily recycled three dimensional Cu@CuO NWs architecture can afford new ideas for the Fenton chemistry. (C) 2018 Elsevier B.V. All rights reserved.
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