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. 2020;10(11):4191-4205.
doi: 10.1007/s13204-020-01540-6. Epub 2020 Aug 25.

Trimetallic composite nanofibers for antibacterial and photocatalytic dye degradation of mixed dye water

Ashish Gupta  1 , Nayna Khosla  1 , V Govindasamy  2 , Amit Saini  1 , K Annapurna  2 , S R Dhakate  1
Affiliations

Trimetallic composite nanofibers for antibacterial and photocatalytic dye degradation of mixed dye water

Ashish Gupta et al. Appl Nanosci. 2020.

Abstract

Membrane technology is an advanced approach to making a healthier and cleaner environment. Using such catalytic membrane technology to get clean, usable water by removal of dye impurities as well as pathogenic microbes is the main goal behind the research work. Here, we present the synthesis and efficacy study of polymethyl methacrylate (PMMA)-based Ag/ZnO/TiO2 trimetallic bifunctional nanofibers with antibacterial and photocatalytic activity. The nanofibers have been proven to be effective for the degradation of methylene blue (MB 93.4%), rhodamine B (Rh 34.6%), auramine-O (Au 65.0%) and fuchsin basic (FB 69.8%) dyes individually within 90 min in daylight. The study is further extended in abating a mixture of these dyes from contaminated water using composite nanofibers. Also, in the case of a mixture of these dyes (3 ppm each), nanofibers show dye degradation efficiency (DDE) of 90.9% (MB), 62.4% (Au) and 90.3% (FB and Rh) in 60 min. The role of Ag nanoparticles with a synergic photocatalytic effect on ZnO and TiO2 is also demonstrated. Also, PMMA/ZnO/TiO2 composite fiber membrane in synergy with silver particles shows better antibacterial activity against Gram-negative bacteria E. coli, making PMMA/Ag/ZnO/TiO2 fibers a promising candidate in water purification.

Keywords: Antibacterial; Dye mixture; Membrane; Nanofibers; Photocatalysis.

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Conflict of interest statement

Conflict of interestThe authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Schematic of the synthesis process for PAZT nanofibers
Fig. 2
Fig. 2
SEM images of as-synthesized a ZnO particles, b TiO2 particles, c PZT fibers, d PAZT fibers
Fig. 3
Fig. 3
TEM images of a ZnO particles, b HRTEM of ZnO particles, c PZT fibers and d PAZT fibers containing particles
Fig. 4
Fig. 4
XRD graph for a ZnO particles, b TiO2 particles, c PZT and d PAZT nanofibers
Fig. 5
Fig. 5
Raman analysis graphs of (a) ZnO particles, (b) TiO2 particles, (c) PMMA ZnO/ TiO2 fibers and (d) PMMA Ag/ZnO/TiO2 fibers
Fig. 6
Fig. 6
PL spectrum for PZT and PAZT nanofibers
Fig. 7
Fig. 7
a Standard curve, b UV plot for photocatalytic activity comparison of PZT and PAZT Nanofibers for MB concentration 3 ppm
Fig. 8
Fig. 8
UV plot of photocatalytic activity of PAZT nanofibers for a MB 3 ppm, b FB 1 ppm, c Au 5 ppm, d Rh 1 ppm (inset: water before and after removal of dye)
Fig. 9
Fig. 9
UV plot of photocatalytic activity of PAZT nanofibers on mix dyes, a 3 ppm concentration for each dye, b variable concentration (FB: 1 ppm Au: 2 ppm MB: 3 ppm, Rh: 1 ppm)
Fig. 10
Fig. 10
Antibacterial zone inhibition test for a control sample, b PZT and c PAZT nanofibers
Fig. 11
Fig. 11
The proposed mechanism for antibacterial action of PZT and PAZT nanofibers
See this image and copyright information in PMC

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