Polydopamine-Bi2WO6-Decorated Gauzes as Dual-Functional Membranes for Solar Steam Generation and Photocatalytic Degradation Applications

The dual-functional Bi2WO6/polydopamine (PDA)-modified gauze membrane has been developed for applications in photocatalytic degradation and solar steam generation. Two types of membrane were prepared by changing the growth sequence of Bi2WO6 nanomaterials and PDA on gauze substrates. The spatial dis...

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Bibliographic Details
Published in:Polymers 2021-12, Vol.13 (24), p.4335
Main Authors: Wang, Yea-Chin, Chang, Chi-Jung, Huang, Chih-Feng, Zhang, Hao-Cheng, Kang, Chun-Wen
Format: Article
Language:English
Subjects:
Alternative energy sources
Bismuth compounds
Carbon
Composite materials
Decoloring
Dopamine
Electromagnetic absorption
Electron microscopy
Evaporation rate
Gauze
Indigo
Irradiation
Light
Luminous intensity
Membranes
Morphology
Nanomaterials
Nanoparticles
Optical properties
Photocatalysis
Photodegradation
Photoelectrons
Pollutants
Polyesters
Polymerization
Polymers
Polyvinyl alcohol
Solar energy
Spatial distribution
Steam generation
Substrates
Tungstates
Water treatment
Wetting
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Summary:The dual-functional Bi2WO6/polydopamine (PDA)-modified gauze membrane has been developed for applications in photocatalytic degradation and solar steam generation. Two types of membrane were prepared by changing the growth sequence of Bi2WO6 nanomaterials and PDA on gauze substrates. The spatial distribution of Bi2WO6 and polydopamine has a great influence on light absorption, photocatalytic degradation, and solar steam generation performances. Bi2WO6 photocatalysts can absorb short-wavelength light for the photocatalytic decoloration of organic dyes. The photothermal polydopamine can convert light into heat for water evaporation. Besides, the gauze substrate provides water transport channels to facilitate water evaporation. The morphology, surface chemistry, and optical properties of Bi2WO6-PDA modified gauzes were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and diffuse reflectance spectra. The photothermal properties, wetting properties, and solar steam generation rates of the composite films were also studied. Degradation of 96% of indigo carmine was achieved after being irradiated for 120 min in the presence of G/PDA/BWNP. The water evaporation rates of the G/BWP/PDA sample under the irradiation of an Xe lamp (light intensity = 1000 W/m2) reached 1.94 kg·m−2·h−1.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym13244335