In-situ Photocatalytic Process of Rhodamine B over g-C3N4@Ag3PO4 Nanocomposites Based on Photomicrocalorimeter-fluorescence Spectrometry†

doi:10.7503/cjcu20170371

Abstract

Abstract:

A photomicrocalorimeter-fluorescence spectrometer was applied to obtain in-situ thermodynamics, kinetics and 3D fluorescence spectra of Rhodamine B photocatalysis over g-C₃N₄@Ag₃PO₄ nanocomposites. And its mechanism was investigated by coupling the thermodynamics and its spectroscopic information. Consequently, the whole process underwent an initial endothermic reaction and a subsequent exothermic stage, and finally maintained a stable exothermic platform. The intensity of fluorescence emission peak of Rhodamine B over g-C₃N₄@Ag₃PO₄ decreased sharply within the illumination of 10 min, its degradation rate reached 92.9%, which was 2.06 times that over g-C₃N₄. Subsequently, the photodegradation of the ring and intermediates without fluorescent chromophores were dominated, which maintained a stable exothermic rate of -(0.226±0.0916) mJ/s with a pseudo-zero order process. This process was the rate-determining step. Therefore, Rhodamine B photocatalysis was a pseudo-zero-order process rather than a first order process.

Key words: Photocatalysis, g-C₃N₃@Ag₃PO₃, Photomicrocalorimeter, In-situ fluorescence spectrum, Thermokinetics

CLC Number:

O645

TrendMD:

WAN Ting, LI Xingxing, HUANG Zaiyin, QIU Jiangyuan, ZUO Chen, TAN Xuecai. In-situ Photocatalytic Process of Rhodamine B over g-C₃N₄@Ag₃PO₄ Nanocomposites Based on Photomicrocalorimeter-fluorescence Spectrometry^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2226.

Figures/Tables 3

Fig.1 XRD patterns of g-C3N4(a) and g-C3N4@Ag3PO4(b)(A) and SEM image of g-C3N4@Ag3PO4(B)

Fig.2 Photocatalytic degradation(A) and plots of ln(c/c0) vs. time(B) of RhB over g-C3N4 and g-C3N4@Ag3PO4 under visible-light irradiationa. Blank; b. g-C3N4; c. g-C3N4@Ag3PO4.

Fig.3 Heat change(A), heat flow curves(B) of RhB photocatalytic degradation over g-C3N4 and g-C3N4@Ag3PO4, fluorescence intensity vs. wavelength vs. time curves of photocatalytic degradation of RhB over g-C3N4@Ag3PO4(C) and plots of c/c0 vs. time detected by in situ 3D fluorescence spectra(D) of g-C3N4 and g-C3N4@Ag3PO4

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In-situ Photocatalytic Process of Rhodamine B over g-C₃N₄@Ag₃PO₄ Nanocomposites Based on Photomicrocalorimeter-fluorescence Spectrometry^†

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