Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 28, Pages 23687-23697Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b04902
Keywords
photocatalytic membranes; polydopamine; Au-TiO2 nanocomposite; tetracycline; visible-light degradation
Funding
- Graduate Practice Innovation Program of Jiangsu Province [SJLX160431]
- National Natural Science Foundation of China [U1507118, U1407123, 21406085, 21676127]
- Natural Science Foundation of Jiangsu Province [BK20151350, BK20140580, BK20161367]
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A bioinspired photocatalytic nanocomposite membrane was successfully prepared via polydopamine (pDA)-coated poly(vinylidene fluoride) (PVDF) membrane, as a secondary platform for vacuum-filtrated Au-TiO2 nanocomposites, with enhanced photocatalytic activity. The degradation efficiency of Au-TiO2/pDA/PVDF membranes reached 92% when exposed to visible light for 120 min, and the degradation efficiency of Au-TiO2/pDA/PVDF membranes increased by 26% compared to that of Au-TiO2 powder and increased by 51% compared to that Of TiO2/pDA/PVDF nanocomposite membranes. The degradation efficiency remained about 90% after five cycle experiments, and the Au-TiO2/pDA/PVDF nanocomposite membranes showed good stability, regeneration performance, and easy recycling. The pDA coating not only served as a bioadhesion interface to improve the bonding force between the catalyst and the membrane substrate but also acted as a photosensitizer to broaden the wavelength response range of TiO2, and the structure of Au-TiO2/pDA/PVDF also improves the transfer rate of photogenerated electrons; the surface plasmon resonance effect of Au also played a positive role in improving the activity of the catalyst. Therefore, we believe that this study opens up a new strategy in preparing, the bioinspired photocatalytic nanocomposite membrane for potential wastewater purification, catalysis, and as a membrane separation field.
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