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Origin of Activity and Stability Enhancement for Ag?PO? Photocatalyst after Calcination.

ABSTRACT: Pristine Ag?PO? microspheres were synthesized by a co-precipitation method, followed by being calcined at different temperatures to obtain a series of calcined Ag?PO? photocatalysts. This work aims to investigate the origin of activity and stability enhancement for Ag?PO? photocatalyst after calcination based on the systematical analyses of the structures, morphologies, chemical states of elements, oxygen defects, optical absorption properties, separation and transfer of photogenerated electron-hole pairs, and active species. The results indicate that oxygen vacancies (V_O??) are created and metallic silver nanoparticles (Ag NPs) are formed by the reaction of partial Ag? in Ag?PO? semiconductor with the thermally excited electrons from Ag?PO? and then deposited on the surface of Ag?PO? microspheres during the calcination process. Among the calcined Ag?PO? samples, the Ag?PO?-200 sample exhibits the best photocatalytic activity and greatly enhanced photocatalytic stability for photodegradation of methylene blue (MB) solution under visible light irradiation. Oxygen vacancies play a significantly positive role in the enhancement of photocatalytic activity, while metallic Ag has a very important effect on improving the photocatalytic stability. Overall, the present work provides some powerful evidences and a deep understanding on the origin of activity and stability enhancement for the Ag?PO? photocatalyst after calcination.

SUBMITTER: Dong P

PROVIDER: S-EPMC5457017 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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Origin of Activity and Stability Enhancement for Ag₃PO₄ Photocatalyst after Calcination.

Dong Pengyu P Hou Guihua G Liu Chao C Zhang Xinjiang X Tian Hao H Xu Fenghua F Xi Xinguo X Shao Rong R

Materials (Basel, Switzerland) 20161129 12

Pristine Ag₃PO₄ microspheres were synthesized by a co-precipitation method, followed by being calcined at different temperatures to obtain a series of calcined Ag₃PO₄ photocatalysts. This work aims to investigate the origin of activity and stability enhancement for Ag₃PO₄ photocatalyst after calcination based on the systematical analyses of the structures, morphologies, chemical states of elements, oxygen defects, optical absorption properties, separation and transfer of photogenerated electron- ...[more]

PMID: 28774088

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Project description:Bacterial and organic pollutants are major problems with potential adverse impacts on human health and the environment. A promising strategy to alleviate these impacts consists in designing innovative photocatalysts with a wider spectrum of application. In this paper, we report the improved photocatalytic and antibacterial activities of chemically precipitated Ag3PO4 microcrystals by the incorporation of W at doping levels 0.5, 1, and 2 mol %. The presence of W directly influences the crystallization of Ag3PO4, affecting the morphology, particle size, and surface area of the microcrystals. Also, the characterization via experimental and theoretical approaches evidenced a high density of disordered [AgO4], [PO4], and [WO4] structural clusters due to the substitution of P5+ by W6+ into the Ag3PO4 lattice. This leads to new defect-related energy states, which decreases the band gap energy of the materials (from 2.27 to 2.04 eV) and delays the recombination of e'-h• pairs, leading to an enhanced degradation process. As a result of such behaviors, W-doped Ag3PO4 (Ag3PO4:W) is a better visible-light photocatalyst than Ag3PO4, demonstrated here by the photodegradation of potential environmental pollutants. The degradation of rhodamine B dye was 100% in 4 min for Ag3PO4:W 1%, and for Ag3PO4, the obtained result was 90% of degradation in 15 min of reaction. Ag3PO4:W 1% allowed the total degradation of cephalexin antibiotic in only 4 min, whereas pure Ag3PO4 took 20 min to achieve the same result. For the degradation of imidacloprid insecticide, Ag3PO4:W 1% allowed 90% of degradation, whereas Ag3PO4 allowed 40%, both in 20 min of reaction. Moreover, the presence of W-dopant results in a 16-fold improvement of bactericidal performance against methicillin-resistant Staphylococcus aureus. The outstanding results using the Ag3PO4:W material demonstrated its potential multifunctionality for the control of organic pollutants and bacteria in environmental applications.

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Origin of Activity and Stability Enhancement for Ag?PO? Photocatalyst after Calcination.

Publications

Origin of Activity and Stability Enhancement for Ag₃PO₄ Photocatalyst after Calcination.

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