Photocatalytic action of silver-titanium dioxide nanocomposite against pathogenic bacteria (original) (raw)

2018

Centre for Environmental Science and Engineering, Department of Bioscience and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India <em>E</em>-<em>mail</em> : sbharti05@iitb.ac.in, mukherji@iitb.ac.in, mitras@iitb.ac.in <em>Manuscript received 15 November 2017, accepted 26 February 2018</em> <strong>Various waterborne disease outbreaks have been reported even after disinfection with conventional techniques due to development of resistance in microorganism. Moreover, generation of carcinogenic disin­fection by-products (DBPs) poses additional problems. This has prompted an exploration of alternative anti­microbial agents for disinfection of water. Over the last few decades, photocatalysis has been widely applied for degradation of various pollutants and inactivation of waterborne microbial pathogens. The present study was focused on the synthesis and characterization of Ag-TiO<sub>2</sub> nanocomposi...

One-step green synthesis of TiO2-Ag nanocomposites and their performance towards photocatalytic activities and antimicrobial properties

2017

Heterogeneous nanocomposites consist of metal oxide and noble metals such as titanium dioxide (TiO 2 )-silver (Ag) are explored extensively using various methods. In the current work, TiO 2 -Ag nanocomposites (NCs) were prepared using a facile hydrothermal technique. The nanocomposites were synthesised at 160 °C for 24 hours with titanium(IV) isopropoxide (TTIP), silver nitrate (AgNO 3 ) as precursors and polyvinylpyrrolidone (PVP) as a reducing agent. The sample with the best antibacterial and photocatalytic properties were further characterised by X-ray diffraction (XRD), nitrogen adsorption analysis (NAA) and field-emission scanning electron microscopy (FESEM). The as-synthesised TiO 2 -Ag nanocomposites with different TTIP loading were tested on methylene blue under sunlight as well as antibacterial activities against Gram-positive bacteria ( Bacillus subtilis ) and Gram-negative bacteria ( Escherichia coli ). TiO 2 -Ag nanocomposite showed two times broader zone of inhibition t...

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