Controlled Synthesis and Photocatalytic Activity Evaluation of Nanostructured Ag3PO4

doi:10.15541/jim20160311

Abstract

Abstract:

Silver phosphate (Ag₃PO₄) materials with different nanostructures including rod, cambiform and tetrahedron with round edges and corners were synthesized by adjusting the molar ratio (W) of water to surfactant in a reverse microemulsion, which consists of sodium dodecyl sulfate (SDS), isopentyl alcohol, cyclohexane, and aqueous solution, using silver nitrate and potassium dihydrogen phosphate as starting materials. The structure, morphology and visible-light-response of the obtained samples were characterized by XRD, SEM, HRTEM, and UV-Vis-DRS spectra. The formation mechanisms of nanostructured Ag₃PO₄ were discussed. Moreover, the photocatalytic activity was also evaluated by means of degradation of organic dye methylene blue (MB) in water. The results show that all the samples have body-centred cubic crystal structure, and the W value has an obvious effect on morphologly of nanostructured Ag₃PO₄. The varied morphologies can be attributed to the change of diameter and interfacial film strength of water nuclear influenced by SDS content. In addition, all the obtained samples exhibit excellent efficient photocatalytic activity for the photo-degradation of methylene blue (MB) under visible light irradiation, and the tetrahedral Ag₃PO₄ with exposed many {111} facets exhibits the best photocatalytic activity.

Key words: reverse phase microemulsion, silver phosphate, nanostructure, visible light response, photocatalytic activity

CLC Number:

CAI Wei-Wei, LI Jiao, HE Jing, WANG Wei-Wei. Controlled Synthesis and Photocatalytic Activity Evaluation of Nanostructured Ag₃PO₄[J]. Journal of Inorganic Materials, 2017, 32(3): 263-268.

Figures/Tables 7

Fig. 1 XRD patterns of Ag3PO4 nanomaterials prepared with different W values

Fig. 2 SEM images of Ag3PO4 nanomaterials prepared with different W values(a) W=10; (b) W=15; (c) W=20; (d) W=25

Fig. 3 TEM images of the tetrahedral Ag3PO4 (a) and HRTEM image of Ag3PO4 nanoparticle (b)

Fig. 4 Size and morphology controlling mechanism of Ag3PO4 in microemulsions

Fig. 5 UV-Vis diffuse reflectance spectra (a) and (ahv) vs hv plats (b) for different W values samples

Fig. 6 Photocatalytic degradation of MB over different samples prepared under visible-light irradiation with different W values (a) and W=25 (b)

Fig. 7 HRTEM image of Ag3PO4 nanoparticle prepared with different W values (a) W=25; (b) W=15

References 16

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Controlled Synthesis and Photocatalytic Activity Evaluation of Nanostructured Ag₃PO₄

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