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Nanosystems: Phys. Chem. Math., 2022, 13 (1), 104–114

Synthesis and antibacterial activity of transition metal (Ni/Mn) co-doped TiO2 nanophotocatalyst on different pathogens under visible light irradiation

Sankara Rao Miditana – Government Degree College, Puttur, Chittoor, Andhra Pradesh – 517583, India; Andhra University, Visakhapatnam, Andhra Pradesh – 530003, India; sraom90@gmail.com
Siva Rao Tirukkovalluri – Andhra University, Visakhapatnam, Andhra Pradesh – 530003, India; sivaraoau@gmail.com
Imandi Manga Raju – Andhra University, Visakhapatnam, Andhra Pradesh – 530003, India; mangorchem@gmail.com

Corresponding author: Sankara Rao Miditana, sraom90@gmail.com

DOI 10.17586/2220-8054-2022-13-1-104-114

ABSTRACT Visible light driven photocatalytically active mesoporous nanomaterials plays an indispensable role for antibacterial activity in low light applications. In this work, nanomaterials were handily prepared by varying the dopant concentrations from 0.25 to 1.0 Wt % using sol-gel method. All the prepared samples were characterized by Powdered X-ray diffraction (XRD), Scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), Ultraviolet-visible diffuse reflectance spectroscopy (UV/Vis-DRS), Transmission electron microscopy (TEM) and Brauner–Emmett–Teller (BET). The characterization results revealed that a photocatalytically active phase i.e.; anatase and rutile mixed phase was observed for co-doped catalyst samples. Due to substitutional doping of Mn and Ni by replacing Ti, the frequency shift of Ti–O–Ti in the catalyst samples was observed by FTIR. Further the catalyst shows roughmorphology, irregular particle shape with less particle size having high surface area, and reduced band gap energy. The photocatalytically active materials antibacterial activity was discerned by using Sphingomonas paucimobilis and Pseudomonas fluorescence. The result of antibacterial activity shows that among all nanocatalysts, NMT2 catalyst shows optimum zone of inhibition at 25.1±0.2 mm for Sphingomonas paucimobilis and 18.1±0.2 mm for Pseudomonas fluorescence compared to standard (chloramphenicol) value at 24.1±0.1 mm and 23.1±0.05 mm at 100 μg/mL respectively.

KEYWORDS nanomaterials, photocatalysis, Ni/Mn–TiO2, antibacterial activity, agar-well diffusion method

FOR CITATION Miditana S.R., Tirukkovalluri S.R., Raju I.M. Synthesis and antibacterial activity of transition metal (Ni/Mn) co-doped TiO2 nanophotocatalyst on different pathogens under visible light irradiation. Nanosystems: Phys. Chem. Math., 2022, 13 (1), 104–114.

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