Enhanced disinfection of Escherichia coli and bacteriophage MS2 in water using a copper and silver loaded titanium dioxide nanowire membrane

  • Guiying Rao
  • Kristen S. Brastad
  • Qianyi Zhang
  • Rebecca Robinson
  • Zhen He
  • Ying Li
Research Article

DOI: 10.1007/s11783-016-0854-x

Cite this article as:
Rao, G., Brastad, K.S., Zhang, Q. et al. Front. Environ. Sci. Eng. (2016) 10: 11. doi:10.1007/s11783-016-0854-x

Abstract

Titanium dioxide (TiO2) is a widely used photocatalyst that has been demonstrated for microorganism disinfection in drinking water. In this study, a new material with a novel structure, silver and copper loaded TiO2 nanowire membrane (Cu-Ag-TiO2) was prepared and evaluated for its efficiency to inactivate E. coli and bacteriophage MS2. Enhanced photo-activated bactericidal and virucidal activities were obtained by the Cu-Ag-TiO2 membrane than by the TiO2, Ag-TiO2 and Cu-TiO2 membranes under both dark and UV light illumination. The better performance was attributed to the synergies of enhanced membrane photoactivity by loading silver and copper on the membrane and the synergistic effect between the free silver and copper ions in water. At the end of a 30 min test of deadend filtration under 254 nm UV irradiation, the Cu-Ag-TiO2 membrane was able to obtain an E. coli removal of 7.68 log and bacteriophage MS2 removal of 4.02 log, which have met the US EPA standard. The free metal ions coming off the membrane have concentrations of less than 10 ppb in the water effluent, far below the US EPA maximum contaminant level for silver and copper ions in drinking water. Therefore, the photo-activated disinfection by the Cu-Ag-TiO2 membrane is a viable technique for meeting drinking water treatment standards of microbiological water purifiers.

Keywords

Photo-activated disinfection Titanium dioxide Nanowire membrane Silver Copper 

Supplementary material

11783_2016_854_MOESM1_ESM.pdf (65 kb)
Supplementary material, approximately 66 KB.

Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Guiying Rao
    • 1
  • Kristen S. Brastad
    • 2
    • 3
  • Qianyi Zhang
    • 2
  • Rebecca Robinson
    • 3
  • Zhen He
    • 4
  • Ying Li
    • 1
  1. 1.Department of Mechanical EngineeringTexas A&M UniversityCollege StationUSA
  2. 2.Department of Mechanical EngineeringUniversity of Wisconsin-MilwaukeeMilwaukeeUSA
  3. 3.A.O. Smith Corporate Technology CenterMilwaukeeUSA
  4. 4.Department of Civil and Environmental EngineeringVirginia Polytechnic Institute and State UniversityBlacksburgUSA

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