Photocatalytic disinfection for point-of-use water treatment using Ti3+ self-doping TiO2 nanoparticle decorated ceramic disk filter

Ying Liang; Guohe Huang; Yongping Li; Yao Yao; Xiaying Xin; Xiang Li; Jianan Yin; Sichen Gao; Yuwei Wu; Xiujuan Chen; Renfei Feng

doi:10.1016/j.envres.2022.113602

Photocatalytic disinfection for point-of-use water treatment using Ti³⁺ self-doping TiO₂ nanoparticle decorated ceramic disk filter

Environ Res. 2022 Sep;212(Pt E):113602. doi: 10.1016/j.envres.2022.113602. Epub 2022 Jun 2.

Authors

Ying Liang¹, Guohe Huang², Yongping Li¹, Yao Yao³, Xiaying Xin⁴, Xiang Li¹, Jianan Yin³, Sichen Gao³, Yuwei Wu³, Xiujuan Chen⁵, Renfei Feng⁶

Affiliations

¹ State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China.
² State Key Joint Laboratory of Environmental Simulation and Pollution Control, China-Canada Center for Energy, Environment and Ecology Research, UR-BNU, School of Environment, Beijing Normal University, Beijing, 100875, China. Electronic address: huang@iseis.org.
³ Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada.
⁴ State Key Laboratory of Marine Pollution (SKLMP), and School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong.
⁵ Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada.
⁶ Canadian Light Source, Saskatoon, Saskatchewan, S7N 2 V3, Canada.

PMID: 35660568
DOI: 10.1016/j.envres.2022.113602

Abstract

The challenge from pathogenic infections still threatens the health and life of people in developing areas. An efficient, low-cost, and abundant-resource disinfection method is desired for supplying safe drinking water. This study aims to develop a novel Ti³⁺ doping TiO₂ nanoparticle decorated ceramic disk filter (Ti³⁺/TiO₂@CDF) for point-of-use (POU) disinfection of drinking water. The production of Ti³⁺/TiO₂@CDF was optimized to maximize disinfection efficiency and flow rate. Under optimal conditions, the log reduction value (LRV) could reach up to 7.18 and the flaw rate was 108 mL/h. The influences of environmental factors were also investigated. Natural or slightly alkaline conditions, low turbidity, and low concentration of humic acid were favorable for the disinfection of Ti³⁺/TiO₂@CDF, while co-existing HCO₃^- ions and diatomic cations (Ca²⁺ and Mg²⁺) exhibited the opposite effect. Furthermore, the practicability and stability of Ti³⁺/TiO₂@CDF was demonstrated. Ti³⁺/TiO₂@CDF showed high disinfection efficiency for E. coli and S. aureus under a range of concentrations. Long-term experiment indicated that Ti³⁺/TiO₂@CDF was stable. The underlying disinfection mechanisms were investigated and concluded as the combination of retention, adsorption, and photocatalytic disinfection. The developed Ti³⁺/TiO₂@CDF can provide an effective and reliable disinfection tool for POU water treatment in remote area.

Keywords: Ceramic disk filter; Drinking water; Photocatalytic disinfection; Point-of-use water; Ti(3+) self-doping TiO(2) nanoparticles.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Ceramics
Disinfection / methods
Drinking Water*
Escherichia coli
Humans
Nanoparticles*
Staphylococcus aureus
Titanium
Water Purification* / methods

Substances

Drinking Water
titanium dioxide
Titanium