Exploring hierarchical porous silica-supported Ag3PO4 as high-efficient and environmental-friendly photocatalytic disinfectant
2021
Zheng, Pei | Jin, Bo | Dai, Sheng
Silver orthophosphate (Ag₃PO₄) is an attractive photocatalytic catalyst for disinfection and degradation, but its instability arising from silver release generates significant environmental issue. Aiming to develop a highly efficient and environmental-friendly catalyst, we synthesized Ag₃PO₄ nanoparticle incorporated hierarchical porous silica (Ag₃PO₄@h-SiO₂) as a novel high-performance photocatalytic catalyst without observed silver release. Brain-like hierarchical porous SiO₂ (h-SiO₂) brings a scaffold support with high surface areas, and the h-SiO₂ surface modified thiols are able to anchor in situ formed 10 nm Ag₃PO₄ to eliminate silver release. Systematic investigations revealed that because of its structural advantages, Ag₃PO₄@h-SiO₂ show excellent disinfection and degradation ability under visible-light irradiation and stable characteristics without obviously observed silver leaching during photo-oxidation operation. In-depth scavenger study reveals Ag₃PO₄@h-SiO₂ as an effective semiconducting photocatalyst stimulates the production of photo-generated reactive species, which dominate its distinguished disinfection performance via photo-oxidation. Ag₃PO₄ are anchored to thiol modified hierarchical porous SiO₂ to produce a visible-light responsive photocatalyst of Ag₃PO₄@h-SiO₂. The enhanced catalytic sites and surface areas promote pathogen disinfection, and the structure advantages minimize silver release to environment. Both H₂O₂ and holes being generated in photocatalysis dominate overall disinfection activity.
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