Ag3PO4表面热力学性质及光催化原位过程热动力学的晶面效应

doi:10.3866/PKU.WHXB201611092

Abstract

Abstract:

Cubic{100}, tetrahedral{111}, and rhombic dodecahedral{110} Ag₃PO₄ microcrystals were synthesized via a facile wet chemical method. Their components, structure, morphology, and photoelectrical properties were characterized by field emission scanning electron microscopy (FE-SEM), X-ray powder diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photocurrent and photoluminescence (PL) analyses. The photocatalytic activity of the Ag₃PO₄ crystallites with different morphologies were investigated under visible illumination using rhodamine B (RhB) as a target contaminant. Meanwhile, the surface molar Gibbs free energy of the Ag₃PO₄ crystallites was determined by microcalorimetry via transition state theory and the thermochemical cycle principle. The corresponding values for cubic, tetrahedral, and rhombic dodecahedral microcrystals were 1.2972, 0.9621, and 0.5414 kJ·mol^-1, respectively. The heat effect of the in-situ photocatalytic degradation of RhB and heat flow of the stable exothermic stage over the Ag₃PO₄ crystallites was detected by a LED-photocalorimeter. The results showed that the catalytic activity of Ag₃PO₄ crystallites and the heat effect and heat flow of the stable exothermic stage were positively correlated with their molar Gibbs free energy.Additionally, the main active species for the photocatalytic degradation of RhB over Ag₃PO₄ crystallites were determined by trapping experiments and electron paramagnetic resonance (ESR) spectroscopy.

Key words: Ag₃PO₄, Surface thermodynamics, In-situ photocalorimeter, Photocatalysis, Facet effect

Ming XIAO,Zai-Yin HUANG,Huan-Feng TANG,Sang-Ting LU,Chao LIU. Facet Effect on Surface Thermodynamic Properties and In-situ Photocatalytic Thermokinetics of Ag₃PO₄[J]. Acta Phys. -Chim. Sin. 2017, 33(2), 399-406. doi: 10.3866/PKU.WHXB201611092

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Facet Effect on Surface Thermodynamic Properties and In-situ Photocatalytic Thermokinetics of Ag₃PO₄

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