Publication detail

Antimicrobial activity of printed composite TiO2/SiO2 and TiO2/SiO2/Au thin films under UVA-LED and natural solar radiation

LEVCHUK, I. KRALOVA, M. RUEDA-MÁRQUEZ J. J. MORENO-ANDRÉS, J. GUTIÉRREZ-ALFARO, S. DZIK, P. PAROLA, S. SILLANPÄÄ, M. VAHALA, R. MANZANO, M. A.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

Composite TiO2/SiO2 porous coatings modified with bipyramid-like gold nanoparticles were prepared by means of sol-gel and inkjet printing technique, comprehensively characterized and studied for photocatalytic disinfection of drinking water with fecal contamination by natural bacteria consortia. Photocatalytic antimicrobial activity of prepared thin films was evaluated against gram-negative (Escherichia coli and Total coliforms) and gram-positive bacteria (Enterococci). Elimination rate of all tested bacteria increased when photocatalytic coatings were used in comparison with solar disinfection. The best results in terms of antimicrobial activity were obtained with TiO2/SiO2/Au thin films under natural solar radiation, which demonstrated the highest antimicrobial activity, enhancing the inactivation rates of E. coli, Total coliforms and Enterococci 1.5, 1.3 and 1.6 times, respectively as compared to solar disinfection without photocatalyst. Remarkable difference in bacteria sensitivity for photocatalytic disinfection was observed with trend E. coli > Total coliforms > Enterococci. No release of gold and titanium was detected during photocatalytic water disinfection test. Regrowth of E. coli, Total coliforms and Enterococci after photocatalytic bacteria inactivation under UVA-LED and natural solar radiation was lower than 1% (24, 48 and 72 h), indicating potential application of prepared coatings for production of safe drinking water.

Keywords

Escherichia toll; Total coliforms; Enterococci; Water disinfection; Gold bipyramids

Authors

LEVCHUK, I.; KRALOVA, M.; RUEDA-MÁRQUEZ J. J.; MORENO-ANDRÉS, J.; GUTIÉRREZ-ALFARO, S.; DZIK, P.; PAROLA, S.; SILLANPÄÄ, M.; VAHALA, R.; MANZANO, M. A.

Released

30. 12. 2018

Publisher

ELSEVIER SCIENCE BV

Location

AMSTERDAM, NETHERLANDS

ISBN

0926-3373

Periodical

APPLIED CATALYSIS B-ENVIRONMENTAL

Number

239

State

Kingdom of the Netherlands

Pages from

609

Pages to

618

Pages count

BibTex

@article{BUT156136,
  author="LEVCHUK, I. and KRALOVA, M. and RUEDA-MÁRQUEZ J. J. and MORENO-ANDRÉS, J. and GUTIÉRREZ-ALFARO, S. and DZIK, P. and PAROLA, S. and SILLANPÄÄ, M. and VAHALA, R. and MANZANO, M. A.",
  title="Antimicrobial activity of printed composite TiO2/SiO2 and TiO2/SiO2/Au thin films under UVA-LED and natural solar radiation",
  journal="APPLIED CATALYSIS B-ENVIRONMENTAL",
  year="2018",
  number="239",
  pages="609--618",
  doi="10.1016/j.apcatb.2018.08.051",
  issn="0926-3373"
}