Co/g-C3N4光催化剂的制备及其光降解染料废水的研究
Preparation of Co/g-C3N4 Photocatalyst and Its Photodegradation of Dye Wastewater
DOI: 10.12677/ms.2025.158169, PDF,    科研立项经费支持
作者: 张 趁, 杨峥嵘, 黄本岳, 张子禾, 邹云玲*：中国民航大学理学院，天津；唐浩杰：中国民航大学航空工程学院，天津；杨家煜：中国民航大学电子信息与自动化学院，天津
关键词: 石墨相氮化碳；光催化；掺杂；亚甲基蓝；钴；g-C3N4； Photocatalysis； Doping； Methylene Blue； Cobalt
摘要: 本文以尿素、三聚氰胺和硝酸钴为原料，采用两步法制备了钴掺杂石墨相氮化碳(Co/g-C3N4)光催化剂。利用X射线衍射仪、场发射扫描电子显微镜、比表面积分析仪和紫外可见漫反射光谱仪等手段对所得产物进行了表征。以亚甲基蓝溶液(MB, 10 mg/L)为模拟染料废水，在波长为365 nm的紫外光照射下，测试了所得产物的光催化性能。考察了Co掺杂量对产物的物相结构、形貌及光催化性能的影响。结果表明，所制备的Co/g-C3N4是一种多孔的层状堆叠结构，具有良好的结晶度。钴掺杂后所得样品的光催化性能明显优于纯相g-C3N4。Co的最佳掺杂量为3%，该样品在365 nm紫外光照射120 min后，对MB的降解率约64.52%，比同条件下制备的单相g-C3N4 (22.85%)高近三倍。Co掺杂不仅提高了g-C3N4光催化剂中光生载流子的分离效率，还提高了其比表面积，3% Co/g-C3N4的比表面积(67.28 m2/g)比单相g-C3N4 (10.14 m2/g)提高了6倍以上，进而获得更优的光催化性能。
Abstract: In this paper, cobalt doped graphite phase carbon nitride (Co/g-C3N4) was prepared by a two-step method using urea, melamine and cobalt nitrate as raw materials. The obtained samples were characterized by X-ray diffraction, field emission scanning electron microscopy, specific surface area analyzer and UV-vis diffuse reflection spectrometer. The photocatalytic performance of the samples was evaluated using methylene blue solution (MB, 10 mg/L) as a simulated dye wastewater under UV light with a wavelength of 365 nm. The influence of Co doping amount on the phase structure, morphology and photocatalytic performance of the products was investigated. Experimental results show that the prepared Co/g-C3N4 is a porous layered stacked structure with good crystallinity. The photocatalytic performance of the samples obtained after Co doping is significantly better than that of the single-phase g-C3N4. The optimum amount of Co doping is 3%. After UV irradiation for 120 min with 365 nm light, the photodegradation rate of MB solution is up to 64.52%, three times higher than that of the single-phase g-C3N4 (22.85%) prepared under the same conditions. Co doping not only improves the separation efficiency of photogenerated carriers in g-C3N4 photocatalyst, but also improves its specific surface area. The specific surface area of 3% Co/g-C3N4 (67.28 m2/g) is more than 6 times higher than that of single-phase g-C3N4 (10.14 m2/g), thus leading to better photocatalytic performance.
文章引用：张趁, 唐浩杰, 杨峥嵘, 黄本岳, 张子禾, 杨家煜, 邹云玲. Co/g-C3N4光催化剂的制备及其光降解染料废水的研究[J]. 材料科学, 2025, 15(8): 1591-1601. https://doi.org/10.12677/ms.2025.158169

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