Facet Effect of Single-Crystalline Ag3PO4 Sub-Microcrystals on Photocatalytic Properties

International Center for Materials Nanoarchitectonics (MANA) and Photocatalytic Materials Center, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
Journal of the American Chemical Society (Impact Factor: 12.11). 05/2011; 133(17):6490-2. DOI: 10.1021/ja2002132
Source: PubMed


We recently reported that Ag(3)PO(4) exhibits excellent photooxidative capabilities for O(2) evolution from water and organic dye decomposition under visible-light irradiation. However, very little is known about the shape and facet effects of Ag(3)PO(4) crystals on their photocatalytic properties. Herein we have developed a facile and general route for high-yield fabrication of single-crystalline Ag(3)PO(4) rhombic dodecahedrons with only {110} facets exposed and cubes bounded entirely by {100} facets. Moreover, studies of their photocatalytic performance have indicated that rhombic dodecahedrons exhibit much higher activities than cubes for the degradation of organic contaminants, which may be primarily ascribed to the higher surface energy of {110} facets (1.31 J/m(2)) than of {100} facets (1.12 J/m(2)).

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    • "Titanium dioxide, which has the advantages of chemical stability, low cost and non-toxic, is considered as a suitable photocatalyst material in the field of photocatalytic water purification, photocatalytic water splitting into H 2 , CO 2 photoreduction and so on [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]. "

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    • "It has a relatively narrow band gap (2.36–2.43 eV) and is active under visible-light irradiations ( < 530 nm), which results in photooxidative capability as well as organic dye decomposition [4] [5]. Furthermore, Ag 3 PO 4 has excellent broad spectrum antimicrobial activity due to its releasing profile of Ag + ions [6]. "
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    ABSTRACT: Organic, inorganic, and biological pollutants are typical water contaminants and they seriously affect water quality. In this study, we suggested that a novel multifunctional Ag3PO4 loaded hydroxyapatite (HAP) material can remove the typical pollutants from water. The Ag3PO4/HAP composites were synthesized facilely via in-situ precipitation of Ag3PO4 on the pre-existing HAP nanowires. By optimizing the composition of Ag3PO4 and HAP, the material could achieve an optimal photocatalytic activity to decompose rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) under visible light irradiations with enhanced pH stability. Besides, the adsorption of Pb(II) on the Ag3PO4/HAP reached a maximum capacity of 250mg/g and this value was approximately three times as that of pure HAP. Furthermore, the composite material exhibited excellent antibacterial activities towards gram-negative bacterium (Escherichia coli) and gram-positive bacterium (Stphylococcus aureus). The results highlighted the cooperative effect between Ag3PO4 and hydroxyapatite (HAP). The simultaneous removals of dyes, toxic metal ions, and bacteria with a high efficiency followed an easy approach for the purification of contaminated water via the rationally designed material, in which the Ag3PO4/HAP composite might be developed as a general water treatment material with multiple functions. Copyright © 2015 Elsevier B.V. All rights reserved.
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    • "Another approach is to develop a new visible-light-driven photocatalyst with high activity [8] [9] [10] [11] [12]. Till to now, a lot of novel photocatalysts, including CaBi 2 O 4 [8], Ag 3 PO 4 [10], g-C 3 N 4 [11] and Bi 2 WO 6 [12], has been reported. Among them, g-C 3 N 4 has attracted a great deal of interests due to its good photoactivity, moderate band gap, and low cost. "
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    ABSTRACT: This research was designed for the first time to investigate the activities of CdMoO4/g-C3N4 heterojunction in photocatalytic degradation of rhodamine B (RhB) and converting CO2 to fuels. The composite was synthesized via a simple mixing-calcination method and characterized by various techniques including Brunauer-Emmett-Teller method (BET), X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and electrochemical method. The results showed that the introduction of CdMoO4 to g-C3N4 exerted little effect on the property of light absorption, but resulted in an increase in the BET surface area, which was beneficial for the adsorption of RhB. More importantly, formation of a hetero-junction structure between CdMoO4 and g-C3N4 significantly promoted the separation of electron-hole pairs and ultimately enhanced the photocatalytic activity. The optimal CdMoO4/g-C3N4 composite could degrade RhB 6.5 times faster than pure g-C3N4 under visible light irradiation. Meanwhile, the composite showed a CO2 conversion rate of 25.8μmolh(-1)gcat(-1), which was 4.8 and 8.1 times higher than those of g-C3N4 and P25, respectively, under simulated sunlight irradiation. This work might represent an important step in simultaneous environmental protection and energy production by g-C3N4 based materials. Copyright © 2015 Elsevier B.V. All rights reserved.
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