Abstract
In this study, using the chitosan (Chi), and poly(vinyl alcohol) (PVA) as a matrix for loading TiO2 nanoparticles (NPs), and the chlorophyll (Chl) as a natural light photocatalyst, provided the new, and efficient photocatalyst (PVA/TiO2/Chi/Chl). The TiO2 NPs and chlorophyll were applied to modify the PVA/Chi, and use as an effective nano-photocatalyst for degradation of methylene blue (MB), 4-chlorophenol (4-CP), and Congo red (CR) for the first time which shows efficiently promoted the separation of electron-hole pairs to enhance the photocatalytic activity. The degradation of MB was examined in the presence and absence of visible light. Also, the various contact time and the synergic effect of the different components of the bionanocomposite were studied. The high efficiency (96%) was achieved under visible-light irradiation (LED lamp 70 W by λ is 425 nm) at 60 min. The present bionanocomposite was identified by Fourier-transform infrared (FT-IR) spectra, field-emission scanning electron microscopy (FE-SEM) image, X-ray diffraction (XRD) pattern, and energy-dispersive X-ray (EDX), and photoluminescence (PL) analyses. Also, the antibacterial properties of PVA/TiO2/Chi/Chl as a distinctive feature were examined by the agar disk diffusion and colony counter method. The zone of inhibition for both S. aureus and E. coli bacteria were around 2.08 (±0.02), and 1.98 (±0.02), respectively. The colony counter was checked in the presence and the absence of visible light. Bacterial contamination presents serious risks to human health, therefore the prominent antimicrobial capability bionanocomposite inhibits the growth of both S. aureus, and E. coli bacteria under LED light irradiation. The use of green, and available materials, easy synthetic process, simple extraction method, eco-friendly protocol, high removal efficiency, and noticeable antibacterial properties are advantageous of the present work.
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