Wang Yajing, Yang Wen, Ding Kun
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China.
College of Environmental and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China.
Molecules. 2024 Aug 15;29(16):3871. doi: 10.3390/molecules29163871.
Graphitic carbon nitride (g-CN), known for being nontoxic, highly stable, and environmentally friendly, is extensively used in photocatalytic degradation technologies. Silver nanoparticles effectively capture the photogenerated electrons in g-CN, enhancing the photocatalytic efficiency. This study primarily focused on synthesizing graphitic carbon nitride via thermal polymerization and depositing noble metal silver onto g-CN through photoreduction. Methyl orange (MO) and methylene blue (MB) were targeted as the pollutants in the photocatalytic experiments under visible light in conjunction with a HO system. The characteristics peaks, structure, and morphology were analyzed using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). g-CN loaded with 6% Ag exhibited superior photocatalytic performance; the photocatalytic fraction of the degraded materials of the MO and MB solutions reached 100% within 70 and 80 min, respectively, upon adding 1 mL and 2 mL of HO. ·OH and ·O were the primary active free radicals in the dye degradation process within the synergistic system. Stability tests also demonstrated that the photocatalyst maintained good reusability under the synergistic system.
石墨相氮化碳（g-CN）以无毒、高度稳定且环境友好而闻名，被广泛应用于光催化降解技术。银纳米颗粒能有效捕获g-CN中的光生电子，提高光催化效率。本研究主要聚焦于通过热聚合合成石墨相氮化碳，并通过光还原将贵金属银沉积到g-CN上。在可见光下结合HO体系的光催化实验中，以甲基橙（MO）和亚甲基蓝（MB）作为污染物。使用傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和扫描电子显微镜（SEM）对特征峰、结构和形态进行了分析。负载6%银的g-CN表现出优异的光催化性能；分别加入1 mL和2 mL的HO后，MO和MB溶液降解物的光催化率在70分钟和80分钟内分别达到100%。·OH和·O是协同体系中染料降解过程的主要活性自由基。稳定性测试还表明，该光催化剂在协同体系下保持了良好的可重复使用性。
