Photocatalytic disinfection for point-of-use water treatment using Ti 3+ self-doping TiO 2 nanoparticle decorated ceramic disk filter

• Published in: Environmental research 2022-06, Vol.212 (Pt E), p.113602
• Main Authors: Liang, Ying, Huang, Guohe, Li, Yongping, Yao, Yao, Xin, Xiaying, Li, Xiang, Yin, Jianan, Gao, Sichen, Wu, Yuwei, Chen, Xiujuan, Feng, Renfei
• Format: Article
• Language: English
• ISSN: 1096-0953

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 Ti doping TiO nanoparticle decorated ceramic disk filter (Ti /TiO @CDF) for point-of-use (POU) disinfection of drinking water. The production of Ti /TiO @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 Ti /TiO @CDF, while co-existing HCO ions and diatomic cations (Ca and Mg ) exhibited the opposite effect. Furthermore, the practicability and stability of Ti /TiO @CDF was demonstrated. Ti /TiO @CDF showed high disinfection efficiency for E. coli and S. aureus under a range of concentrations. Long-term experiment indicated that Ti /TiO @CDF was stable. The underlying disinfection mechanisms were investigated and concluded as the combination of retention, adsorption, and photocatalytic disinfection. The developed Ti /TiO @CDF can provide an effective and reliable disinfection tool for POU water treatment in remote area.