Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 250, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117241
Keywords
Z-scheme heterojunction; CdS/Fe3O4/TiO2; Ibuprofen; Hole; Hydroxyl radical; Magnetic separation
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Funding
- National Natural Science Foundation of China [51778256, 51878308]
- Fundamental Research Funds for the Central Universities, HUST [2017KFYXJJ216]
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In this study, a simple hydrothermal method was used to prepare a Z-scheme CdS/Fe3O4/TiO2 nanocomposite photocatalyst for the degradation of ibuprofen under visible light. The fabricated photocatalyst has been comprehensively characterized. It has a uniformly distributed spherical shape, excellent long-wavelength light absorption ability, rapid electron separation and Z-scheme electron transfer. Fe3O4 in the photocatalyst promotes light absorption and the formation of Z-scheme heterojunction as an electron mediator. Under the optimal atomic ratio, 94.2% of ibuprofen can be decomposed after visible light irradiation for 180 min in the presence of CdS/Fe3O4/TiO2 nanocomposite photocatalyst. The dominant reactive species accounting for ibuprofen degradation are holes (h(+)) and hydroxyl radicals (center dot OH). After reaction, the photocatalyst can be easily recollected through magnetic separation. Although the photocatalytic efficiency of reused CdS/Fe3O4/TiO2 nanocomposite photocatalyst decreased, it kept stable good performance (around 75%) after reused for more than 3 cycles. Overall, this study provides an easy method to synthesize a novel magnetic photocatalyst for the photocatalytic degradation of emerging contaminates under visible light.
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