Abstract
For the purpose of establishing a simple route to prepare a metal-semiconductor hybrid catalyst efficiently and reduce its cost through precise doping noble metals. In this study, ultra-trace silver doped TiO2 photocatalysts were fabricated via a “green” ultrasonic impregnation-assisted photoreduction strategy in an ethanol system, and its photocatalytic performance was systematically investigated by utilizing Cr(VI) as the model contaminant. A schottky energy barrier was constructed in Ag@TiO2, which served as a recombination center and possessed superior photocatalytic activity for Cr(VI) reduction. The obtained catalysts exhibited a significant e−/h+ separation efficiency which directly led to an obvious photocatalytic property enhancement. Then, the resultant Ag@TiO2 (0.06 wt %, 30 min irradiation) showed about 2.5 times the activity as that of commercial P25 NPs for Cr(VI) degradation. Moreover, after five cycles, it still maintained considerably high catalytic ability (62%). This work provides a deep insight into preparation techniques of metal-semiconductor photocatalyst and broadens their application prospect.
Highlights
Nowadays, heavy metals pollution in aquatic environments poses serious risks to public health and ecological systems since the rapid development of industrialization [1]
The observed peaks be attributed to the surface plasmon resonance (SPR) effect of spatially confined electrons in Ag should be attributed to the surface plasmon resonance (SPR) effect of spatially confined electrons in nanoparticles and this red-shift might be related to the interaction between Ag and TiO2
Based on ultrasonic impregnation-assisted UV-photoreduction, Ag+ could be fully reduced via a facile in-situ synthetic approach toward ultra-trace silver-doped TiO2 photocatalysts without using any reducing agents
Summary
Heavy metals pollution in aquatic environments poses serious risks to public health and ecological systems since the rapid development of industrialization [1]. To improve the semiconductors’ catalytic performance [21], the noble metal deposition [22] recently has been proven to be a predominant way to heighten the activity of photocatalysis by creating the Schottky barrier at the semiconductor metal interface, which helps in separating the photo-excited electrons in the CB onto the metal nanoparticles (NPs) [23]. To obtain an efficient Ag@TiO2 photocatalyst, the silver dosage is still relatively high (>1 wt %), which greatly elevates its cost and limits its actual application. 4.65 wt % silver dosage by a facile polyol synthesis, and the result showed superior natural antibacterial activity and high-performance photocatalytic disinfection under solar irradiation. A facile photoreduction strategy was utilized to in situ synthesize Ag@TiO2 photocatalysts with ultra and exhibited superior photocatalytic activity on reducing highly toxic Cr(VI). Cr(VI) reduction performance, which provides a deep insight for the application of photocatalysis in wastewater treatment
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
