Next Article in Journal
An Efficient Computational Scheme for Two-Phase Steam Condensation in the Presence of CO2 for Wellbore and Long-Distance Flow
Previous Article in Journal
Progress in Modeling of Silica-Based Membranes and Membrane Reactors for Hydrogen Production and Purification
Previous Article in Special Issue
Solar Fuels by Heterogeneous Photocatalysis: From Understanding Chemical Bases to Process Development
Article Menu
Issue 1 (March) cover image

Export Article

Open AccessArticle

Photocatalytic and Antimicrobial Properties of Ag2O/TiO2 Heterojunction

1
Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
2
Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, 60-965 Poznan, Poland
3
Department of Process Engineering and Chemical Technology, Gdansk University of Technology, 80-233 Gdansk, Poland
4
Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology, Szczecin, Pulaskiego 10, 70-322 Szczecin, Poland
*
Authors to whom correspondence should be addressed.
ChemEngineering 2019, 3(1), 3; https://doi.org/10.3390/chemengineering3010003
Received: 5 December 2018 / Revised: 28 December 2018 / Accepted: 2 January 2019 / Published: 8 January 2019
(This article belongs to the Special Issue Heterogeneous Photocatalysis and Photocatalytic Nanomaterials)
  |  
PDF [5089 KB, uploaded 8 January 2019]
  |  

Abstract

Ag2O/TiO2 heterojunctions were prepared by a simple method, i.e., the grinding of argentous oxide with six different titania photocatalysts. The physicochemical properties of the obtained photocatalysts were characterized by diffuse-reflectance spectroscopy (DRS), X-ray powder diffraction (XRD) and scanning transmission electron microscopy (STEM) with an energy dispersive X-ray spectroscopy (EDS). The photocatalytic activity was investigated for the oxidative decomposition of acetic acid and methanol dehydrogenation under UV/vis irradiation and for the oxidative decomposition of phenol and 2-propanol under vis irradiation. Antimicrobial properties were tested for bacteria (Escherichia coli) and fungi (Candida albicans and Penicillium chrysogenum) under UV and vis irradiation and in the dark. Enhanced activity was observed under UV/vis (with synergism for fine anatase-containing samples) and vis irradiation for almost all samples. This suggests a hindered recombination of charge carriers by p-n heterojunction or Z-scheme mechanisms under UV irradiation and photo-excited electron transfer from Ag2O to TiO2 under vis irradiation. Improved antimicrobial properties were achieved, especially under vis irradiation, probably due to electrostatic attractions between the negative surface of microorganisms and the positively charged Ag2O. View Full-Text
Keywords: heterogeneous photocatalysis; nanocomposites; heterojunction; Ag2O; TiO2; antimicrobial properties heterogeneous photocatalysis; nanocomposites; heterojunction; Ag2O; TiO2; antimicrobial properties
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Endo-Kimura, M.; Janczarek, M.; Bielan, Z.; Zhang, D.; Wang, K.; Markowska-Szczupak, A.; Kowalska, E. Photocatalytic and Antimicrobial Properties of Ag2O/TiO2 Heterojunction. ChemEngineering 2019, 3, 3.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
ChemEngineering EISSN 2305-7084 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top