Journal
CHEMICAL ENGINEERING JOURNAL
Volume 450, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138221
Keywords
Metal-organic framework; Z-scheme heterojunction; Nanoreactor; Photo-Fenton reaction; Confinement effect
Categories
Funding
- National Natural Science Foundation of China [21674028]
- Natural Science Foundation of Heilongjiang Province, China [LH2020B020]
- Fundamental Research Funds for Heilongjiang Province Universities [KJCX201911]
- Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2022TS40]
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Catalytic reactions confined in nanoreactors can be accelerated by utilizing the confinement effect. In this study, a FeS2/MoS2@C nanoreactor with FeS2/MoS2 heterojunctions encapsulated inside a carbon capsule was prepared. The nanoreactor showed improved degradation performance in photo-Fenton reactions, and the catalytic mechanism and advantages of the nanoreactor were revealed.
Catalytic reaction confined in the nanoreactor could be accelerated by taking advantage of confinement effect. Photo-Fenton reaction has already been verified as an effective technique for pollutant degradation. Therefore, it was rational to infer that the degradation performance of photo-Fenton reaction inside the nanoreactor could be further improved. Nevertheless, how to construct a suitable nanoreactor to realize the aim was still a challenge. Herein, FeS2/MoS2@C nanoreactor with FeS2/MoS2 heterojunctions encapsulated inside the carbon capsule was prepared using Fe-MIL-101 as hard template via ions exchange, chelation competition induced polymerization, and calcination in sequence. In photo-Fenton reaction, photo-induced e(-) followed a Z-scheme transfer path, leading to the well-preserved redox capacity of separated e(-) and h(+). A large amount of reactive species were generated inside the capsule, and their contributions followed the order: (OH)-O-center dot > h(+) > O-1(2) >O- center dot(2)-. The complex catalytic mechanism was disclosed via tracing the source of reactive species. Furthermore, to better illustrate the confinement effect, the broken-FeS2/MoS2@C was prepared as a reference. The accelerated degradation rate, better visible-light harvest, enhanced photothermal effect, and higher yield of self-produced O-2 inside the integrated capsule were disclosed. This work illustrates the advantage of nanoreactor, and provides a new vision to improve the degradation performance in photo-Fenton reaction.
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