Details

Autor(en) / Beteiligte

• An, Taicheng
• Zhao, Huijun
• Wong, Po Keung

Titel

Solar Photocatalytic Disinfection by Nano-Ag-Based Photocatalyst

Ist Teil von

• Advances in Photocatalytic Disinfection, 2017, p.129-153

Ort / Verlag

Germany: Springer Berlin / Heidelberg

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Numerous studies have suggested that photocatalytic disinfection is promising as a disinfection method due to its effectiveness against viral pathogens. Its application predominantly depends on the development of a new photocatalyst capable of inactivating viruses and other waterborne pathogens with much less energy used than UV and with sufficiently high throughput. Therefore, the development of visible-light photocatalysts or weak UV photocatalysts has become one of the most important topics in the photocatalysis field for using solar energy. Ag-based nanocomposites are one of the most promising photocatalysts. The photocatalysts, Ti(IV) and Ag co-substituted hydroxyapatite (HAPTiAg), supported silver halides (AgX/TiO2), and plasmonic Ag-AgI/Al2O3, showed high efficiency for killing bacteria. Moreover, its bactericidal activities were much higher than that of P25-TiO2 film. Reactive oxygen species (•OH, O2−•, H2O2) and photogenerated holes (h+) were involved in the reaction. The process of destruction of the cell wall and the cell membrane was verified by TEM, potassium ion leakage, lipid peroxidation, and FTIR measurements. These results suggested that the photocatalytic degradation of the cell structure caused the cell death. The electrostatic force interaction of the bacteria-catalyst significantly affected the efficiency of disinfection on the basis of the E. coli inactivation under different conditions. The detailed study confirmed that the enhanced electron transfer was more crucial than the electrostatic force interaction of bacteria and catalyst for the plasmon-induced inactivation of bacteria using Ag-AgI/Al2O3.