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

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

1.
College of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, P. R. China;
2.
Key Laboratory of Forest Chemistry and Engineering, Guangxi University for Nationalities, Nanning 530006, P. R. China;
3.
Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry, Nanning 530006, P. R. China

Received Date: 8 September 2016
Revised Date: 9 November 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21273050, 21573048).

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.
- Ag₃PO₄,
- Surface thermodynamics,
- In-situ photocalorimeter,
- Photocatalysis,
- Facet effect
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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