期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 428, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.128202
关键词
Photocatalysis; BiOI; Fenton-like; Fe(III)/Fe(II) redox cycle; Water treatment
资金
- National Natural Science Foundation of China [4210071265]
- Applied Basic Research Project of Science and Technology Department of Sichuan Province [2021YJ0379]
- Sichuan University Technology Innovation Project [2021-YF0500350-SN]
BiOI was introduced into the Fe(III)/PDS system to accelerate the photo-Fenton reaction process under visible light irradiation. The system showed excellent ability to degrade organic pollutants in water, with hydroxyl radicals and sulfate radicals as the main reactive species. Fe(II) absorbed on the surface of BiOI was responsible for PDS consumption, and the reduction of Fe(III) by photogenerated electrons effectively inhibited the recombination of electron-hole pairs and accelerated the rate-limiting step in PDS activation.
In order to accelerate the photo-Fenton reaction process of Fe(III) under visible light irradiation, BiOI was introduced into the Fe(III)/peroxydisulfate (PDS) system. The catalytic oxidation performance of vis-light/BiOI/Fe(III)/PDS system was evaluated using bisphenol AF (BPAF) as a representative organic contaminant. Within 30 min, nearly 100% of BPAF was degraded, proving that the system had an excellent ability to degrade organic pollutants in water. Free radical quenching experiments, electron spin resonance (ESR), and molecular probing experiments determined that the main reactive species in the system were hydroxyl radicals ((OH)-O-center dot) and sulfate radicals (SO4(center dot)(- )). The comparative experiments showed that the degradation rates were closely related to the PDS consumption, while the Fe(II) absorbed on the surface of BiOI was responsible for the PDS consumption. The production pathway of Fe(II) was analyzed by XRD, FTIR and XPS characterization, the Fe(III) on the surface of BiOI was reduced by photogenerated electrons to generate Fe(II). The result confirmed that the reduction of Fe(III) by photogenerated electrons could effectively inhibit the recombination of electron-hole pairs, and accelerate the reduction progress of Fe(III)/Fe(II) cycle that was the rate-limiting step in PDS activation. Afterwards, a reliable mechanism for degradation of BPAF in visible light/BiOI/Fe(III)/PDS system was proposed. Finally, the influence of reactant dosages, visible light intensity, initial pH, humic acid (HA) and anions in the solution on the degradation of BPAF were discussed.
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