研究目的
To overcome the intrinsic drawback of pristine g-C3N4 by synthesizing a nano-composite photo-catalyst Au/S-C3N4 with controllable nanoscale gold (Au) particles for enhanced photocatalytic decomposition of Rhodamine B (RhB) under visible light irradiation.
研究成果
The Au/S-C3N4 hybrid photocatalysts with 2 wt% Au loading exhibited superior photocatalytic degradation activity for RhB under visible light irradiation, attributed to the synergistic effect of gold and sulfur on g-C3N4. The study provides insights into the mechanism of enhanced photocatalytic activity and suggests potential applications in environmental conservation.
研究不足
The study focuses on the photocatalytic degradation of RhB under visible light irradiation. The effects of other pollutants and under different light conditions were not explored. The scalability and practical application of the synthesized photocatalyst in real-world environmental conditions were not addressed.
1：Experimental Design and Method Selection
The synthesis of Au/S-C3N4 was achieved by a modified impregnation reduction method. The content of chloroauric acid was varied to control the diameter and density of the Au nanoparticles.
2：Sample Selection and Data Sources
Thiourea was used as the precursor for sulfur-doped carbon nitride (S-C3N4). Chloroauric acid (HAuCl4) and sodium borohydride (NaBH4) were used for the synthesis of Au nanoparticles.
3：List of Experimental Equipment and Materials
X-ray diffraction (XRD, Rigaku X-ray diffractometer), Fourier transform infrared spectra (FT-IR, NEXUS 670 FT-IR spectrophotometer), transmission electron microscopy (TEM, FEI Titan G2 Environmental TEM), photoluminescence emission spectra (PL, Horiba Jobin Yvon spectrofluorometer), XPS measurements (Thermo Escalab 250 XPS system), UV-vis absorption spectra (shimadzu UV2600 spectrophotometer).
4：Experimental Procedures and Operational Workflow
S-C3N4 was synthesized by direct pyrolysis of thiourea. Au/S-C3N4 was prepared by adding HAuCl4 solution to S-C3N4, followed by reduction with NaBH4. The photocatalytic activity was evaluated by the degradation of RhB under visible-light irradiation.
5：Data Analysis Methods
The degradation rate of RhB was analyzed using pseudo-first-order kinetics. The structural and morphological characteristics of the samples were analyzed using XRD, FT-IR, TEM, PL, and XPS.
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