The self-assembly and formation mechanism of regenerated cellulose films for photocatalytic degradation of C.I. Reactive Blue 19
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In this paper, a simple method has been developed to fabricate flexible fiber materials with excellent visible light response. Firstly, polydopamine (PDA) layer was deposited on the cotton fibers to functionize cotton fibers. Then, a uniformly dense layer of silver and tungsten trioxide nanoparticles was obtained on cotton fabric by reduction of PDA. The deposition of PDA provided a media for the Ag–WO3 photocatalyst to be loaded with good adhension. The results showed that the prepared cotton (C)-PDA–Ag–WO3(c) composite photocatalytic material exhibited excellent photocatalytic performance with 98% degradation efficiency of RB-19 dye solution within 180 min under visible light irradiation. Moreover, the degradation rate constants were 52.43 ×, 35.73 ×, 12.01 × and 3.77 × higher than those of raw cotton, C-PDA, C-PDA-Ag and C-PDA-Ag–WO3(a), respectively. The free radical trapping experiments showed that h+, ·OH and ·O2− were important active species in the photocatalytic process. Based on the characterizations of the system, the possible photocatalytic reaction mechanism of the C-PDA-Ag–WO3(c) composite photocatalytic material was proposed. This paper provided a new perspective for the preparation of high catalytic performance visible light responsive flexible fiber materials applied in the degradation of dye wastewater.
KeywordsC-PDA-Ag–WO3(c) Photocatalytic fabric Photodegradation Visible light Recycle and reuse
This research was supported by the Public Welfare Technology Application Research Project of Zhejiang Province China (LGG18E030002), the Natural Science Foundation of Shanghai (17ZR1400400) and Guangxi Innovation Drive Development Fund (AA17204076).
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