| 许林越，王 倩，王 贝*.PDIN/g-C3N4复合光催化剂的制备及其在四环素
降解中的应用[J].海南师范大学学报自科版,2025,38(2):202-207 |
| PDIN/g-C3N4复合光催化剂的制备及其在四环素
降解中的应用 |
| Preparation of PDIN/g-C3N4 Composite Photocatalyst and Its Application in Tetracycline Degradation |
| |
| DOI：10.12051/j.issn.1674-4942.2025.02.011 |
| 中文关键词: 石墨氮化碳 降解 光催化 四环素 |
| 英文关键词: graphite carbon nitride degradation photocatalyst tetracycline |
| 基金项目:海南省自然科学基金青年基金项目（521QN238） |
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| 中文摘要: |
| 石墨相氮化碳（g-C3N4
）是一种良好的非金属光催化剂，但其光催化性能受有限的可见光
吸收、光生电子空穴对快速复合等因素影响。本研究从提升光响应和促进电荷分离出发，利用水热法
制备了PDIN/g-C3N4复合光催化剂，将二者以不同比例复合并研究了其对四环素的光催化降解作用。
光催化剂降解四环素的实验表明，g-C3N4-20复合材料对四环素的光催化降解效率最高，降解反应速
率常数为0.005 2/min。降解动力学曲线符合一级反应动力学。通过扫描电子显微镜和傅立叶红外光
谱分析了样品的表面形貌以及官能团种类。紫外-可见漫反射光谱分析说明PDIN的引入提高了gC3N4可见光吸收能力。稳态荧光光谱分析表明复合光催化剂内部能够发生更加有效的电荷转移。电
化学阻抗谱结果证明了复合材料能够促进光生电子-空穴对的有效分离。因此得出复合光催化剂性
能提升的主要原因为：PDIN通过π-π堆积相互作用与g-C3N4形成异质结，促进了光生电荷转移过程，
结合有效的可见光吸收共同促进了对四环素的光催化降解作用。猝灭实验表明复合光催化剂降解四
环素的主要活性物质是·O2
-
和·OH。本研究合成的PDIN/g-C3N4复合光催化剂显著提升了四环素降
解效果，为四环素废水处理提供了新的思路和方法，具有重要的理论和实际应用价值。 |
| 英文摘要: |
| Photocatalysis is an ideal method for tetracycline degradation in wastewater because of its green, highly effi⁃
cient and energy saving advantages. Graphite phase carbon nitride (g-C3N4) is a good nonmetallic photocatalyst, but its pho⁃
tocatalytic performance is affected by the limited absorption of visible light and the rapid recombination of photogenerated
electron holes. In order to improve photo response and charge separation, PDIN/g-C3N4 composite photocatalyst was pre⁃
pared by hydrothermal method. The photocatalytic degradation efficiencies of tetracycline were studied by combining PDIN/
g-C3N4 in different proportions. The experiment of photocatalytic degradation of tetracycline showed that g-C3N4-20 com⁃
posite had the highest photocatalytic degradation efficiency, and the degradation rate constant was 0.005 2/min. The degra⁃
dation kinetics curves were consistent with first-order reaction kinetics. The surface morphology and functional groups of the samples were analyzed by scanning electron microscopy and Fourier infrared spectroscopy. Ultraviolet-visible diffuse
reflectance analysis showed that the introduction of PDIN improved the visible light absorption capacity of g-C3N4. The
steady-state fluorescence spectroscopy analysis showed that more effective charge transfer can occur inside the composite
photocatalyst.. The results of electrochemical impedance spectroscopy showed that the composite can promote the separa⁃
tion of photogenerated electron-hole pairs effectively. Therefore, the main reason for the improvement of the performance of
the composite photocatalyst is that PDIN forms a heterojunction with g-C3N4 through π-π packing interaction, which pro⁃
motes the photogenerated charge transfer process, and promotes the photocatalytic degradation of tetracycline together with
effective visible light absorption. The quenching experiments showed that the main active substances of tetracycline degra⁃
dation by composite photocatalyst are ·O2
-
and·OH. The PDIN/g-C3N4 composite photocatalyst synthesized in this paper
significantly improves the degradation effect of tetracycline, and provides a new idea and method for the treatment of tetra⁃
cycline wastewater, which has important theoretical and practical application value. |
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