Synthesis of Cubic-relievo Ag3PO4 with High Visible-light Photocatalytic Activity

doi:10.15541/jim20180455

Abstract

Abstract:

High visible-light photocatalytic activity silver phosphate (Ag₃PO₄) was successfully prepared via a facile water bath method. Scanning electron microscopy (SEM) images show that the products undergo three morphological changes during the reaction process, and the final product has uniform cubic-relievo morphology with an average particle size of about 1.6 μm. X-ray diffraction (XRD) patterns indicate that the samples are body-center cubic structure. In addition, the high resolution transmission electron microscopy (HRTEM) images show that several crystal facets are located in the surfaces of cubic-relievo Ag₃PO₄. UV-Vis absorption and photoluminescence (PL) spectra demonstrate that the products possess high visible-light responsive performance and weak PL emission intensity. The cubic-relievo Ag₃PO₄exhibits significantly higher catalytic performance when applied on the photodegradation of methyl orange (MO) under visible-light irradiation in comparison to the cubic Ag₃PO₄, intermediate products or commercial nitrided TiO₂ photocatalyst. This work indicates that the photocatalytic performance of the catalyst can be effectively improved by changing its surface structure.

Key words: Ag₃PO₄, cubic-relievo, crystal faces, visible-light photocatalysis

CLC Number:

TQ174

WEI Ju-Meng, LÜ Qiang, WANG Ben-Chi, PAN Jia-Le, YE Xiang-Ju, SONG Chang-Chun. Synthesis of Cubic-relievo Ag₃PO₄ with High Visible-light Photocatalytic Activity[J]. Journal of Inorganic Materials, 2019, 34(7): 786-790.

Figures/Tables 8

Scheme 1 Synthesis process and morphology evolution of Ag3PO4 with the reaction time extending

Fig. 1 Different magnification SEM images of initial (a-b), and final products(c-d) with insets showing the correponding histogram of size distribution

Fig. 2 XRD patterns of cubic and cubic-relievo products

Fig. 3 HRTEM images of (a) cubic-relievo Ag3PO4 and (b) cubic Ag3PO4 with insets showing the correspongding FFT patterns of HRTEM images

Fig. 4 (a) Ultraviolet-visible diffusive reflectance spectra, and (b) plots of light energy (αhν)2 vs. photon energy (hν) for the determination of the direct optical band gap of cubic-relievo Ag3PO4 and cubic Ag3PO4

Fig. 5 PL emission spectra of cubic and cubic-relievo Ag3PO4

Fig. 6 Photocatalytic activities of MO over cubic-relievo Ag3PO4, cubic Ag3PO4 and commercial nitrided TiO2 under visible- light irradiation (λ>420 nm) (a), the first-order rate constant of three types of Ag3PO4 on degradation of MO (b)

Fig. 7 Schematic illustration of the mechanism for the photocatalytic performance of cubic-relievo Ag3PO4

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Synthesis of Cubic-relievo Ag₃PO₄ with High Visible-light Photocatalytic Activity

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