A novel P/Ag/Ag2O/Ag3PO4/TiO2 composite film for water purification and antibacterial application,under solar light irradiation

作者：Zhu Qi; Hu Xiaohong; Stanislaus Mishma S; Zhang Nan; Xiao Ruida; Liu Na; Yang Yingnan

来源：Science of the Total Environment, 2017, 577: 236-244.

DOI：10.1016/j.scitotenv.2016.10.170

• P/Ag/Ag2O/Ag3PO4/TiO2 composite film
• Rh B photodegradation
• Bacterial inactivation
• Photocatalytic mechanism
• Simulated solar light irradiation

TiO2-based thin films have been intensively studied in recent years to develop efficient photocatalyst films to degrade refractory organics and inactivate bacteria for wastewater treatment. In the present work, P/Ag/Ag2O/ Ag3PO4/TiO2 composite films on the inner-surface of glass tube were successfully prepared via sol-gel approach. P/Ag/Ag2O/Ago(3)PO(4)/TiO2 composite films with 3 coating layers, synthesized at 400 degrees C for 2 h, showed the optimal photocatalytic performance for rhodamine B (Rh B) degradation. The results indicated that degradation ratio of Rh B by P/Ag/Ag2O/Ag3PO4/TiO2 composite film reached 99.9% after 60 min under simulated solar light, while just 67.9% of Rh B was degraded by pure TiO2 film. Moreover, repeatability experiments indicated that even after five recycling runs, the photodegradation ratio of Rh B over composite film maintained at 99.9%, demonstrating its high stability. Photocatalytic inactivation of E. coli with initial concentration of 10(7) CFU/rnL also showed around 100% of sterilization ratio under simulated solar light irradiation in 5 min by the composite film. The radical trapping experiments implied that the major active species of P/Ag/Ag2O/Ag3PO4/TiO2 composite films were photo generated holes and O-2 center dot(-) radicals. The proposed photocatalytic mechanism shows that the transfer of photo induced electrons and holes may reduce the recombination efficiency of electron-hole pairs and potential photo decomposition of composite film, resulting in enhanced photocatalytic ability of P/Ag/Ag2O/Ag3PO4/TiO2 composite films.

• 出版日期2017-1-15