Abstract
Although photocatalytic reactions using the ultraviolet (UV) range (particularly UV B (280–320 nm) wavelengths) is well-established, the photocatalytic effect of longer wavelengths (especially that of UVA (≥380 nm) and visible light (≥400 nm)) have only recently been studied and utilized for environmental applications. In this work, we coated polydopamine (PDA) and TiO2 on a support and investigated the synergistic effects of the corresponding composites for the photocatalytic removal of gaseous ammonia under 405 nm violet-blue light. The PDA layer with TiO2 was covalently attached on a ceramic ball using the drop-casting method. The roughness and functional groups of the TiO2-PDA coated ball surfaces were verified using an infrared imaging microscope and field emission scanning electron microscope (FE-SEM). The photocatalytic activity of the obtained hybrid TiO2-PDA coated ball for the removal of ammonia was investigated using a UV C and 405 nm LED lamp at 24 °C. The results showed that both the TiO2 (control sample) and TiO2-PDA coated balls successfully removed ammonia under similar experimental conditions with the 254 nm UV C lamp. Notably, the TiO2-PDA coated ball exhibited an enhanced ammonia removal efficiency of 72% under 405 nm LED light irradiation. Thus, the TiO2-PDA coated ball is a promising indoor air cleaning technique under LED light irradiation.
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Acknowledgements
This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grand funded by the Ministry of Land, Infrastructure and Transport (Grant 20CTAP-C157292-01).
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Pak, SH., Park, J.H. & Park, Cg. Preparation of polydopamine-coated TiO2 composites for photocatalytic removal of gaseous ammonia under 405 nm violet-blue light. Korean J. Chem. Eng. 39, 1863–1871 (2022). https://doi.org/10.1007/s11814-022-1122-3
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DOI: https://doi.org/10.1007/s11814-022-1122-3