摘要：

以P掺杂的石墨相氮化碳（P-C₃N₄）为基材，将其与不同质量分数的氯化铜混合后继续焙烧，制备出Cu-P复合改性的石墨相氮化碳可见光光催化剂（Cu/P-C₃N₄）。对样品的结构、光电性能进行了X射线衍射（XRD）、能谱（EDS）、傅里叶变换红外光谱（FT-IR）、光致荧光光谱（PL）、电化学阻抗谱（EIS）等一系列表征。通过可见光催化降解亚甲基蓝考察了它们的光催化活性。结果表明，Cu-P复合改性提高了催化剂的电子转移速率且降低了光生电子空穴对的复合速率，有效改善了其光催化性能。可见光照射120 min，Cu（1.5%）/P-C₃N₄复合材料对亚甲基蓝的降解率达到71.3%，其降解速率常数分别是纯g-C₃N₄和P-C₃N₄的2.17倍和2倍。另外，通过活性物种捕获实验初步研究了各个体系的光催化反应机理。

关键词: 石墨相氮化碳, 铜掺杂, 磷掺杂, 可见光催化

Abstract:

Using P-doped graphitic carbon nitride（P-C₃N₄） as the substrate，it was mixed with different mass fractions of copper chloride and then calcined to prepare a Cu-P composite modified graphitic carbon nitride visible- light photocatalyst（Cu/P-C₃N₄）. The structure and photoelectric properties of the samples were characterized by X-ray diffraction（XRD），energy dispersive spectroscopy（EDS），Fourier transform infrared spectroscopy（FT-IR），photoluminescence spectroscopy（PL） and electrochemical impedance spectroscopy（EIS）. Their photocatalytic activities were investigated by the visible-light photocatalytic degradation of methylene blue. The results showed that the Cu-P composite modification increases the electron transfer rate of the catalyst and reduced the recombination rate of photogenerated electron-hole pairs，effectively improving its photocatalytic performance. When exposed to visible-light for 120 min，the degradation rate of Cu（1.5%）/P-C₃N₄ composite to methylene blue reached 71.3%，and its degradation rate constant was 2.17 times and 2 times that of pure g-C₃N₄ and P-C₃N₄，respectively. In addition，the photocatalytic reaction mechanism of each system was preliminarily studied by active species trapping experiments.

Key words: graphitic carbon nitride, copper doped, phosphor doped, visible-light catalysis

中图分类号: 

• O649.4

• X703