磷掺杂石墨相氮化碳的制备及对磺胺噻唑的可见光催化性能研究

doi:10.19741/j.issn.1673-4831.2018.0278

摘要/Abstract

摘要：

以三聚氰胺和甘油磷脂酰胆碱为前驱体，通过水热法和煅烧法联合处理方式制得磷掺杂的石墨相氮化碳（PCN）；利用X射线衍射（XRD）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、紫外可见吸收光谱（UV-vis DRS）和光致发光光谱（PL）等方法分析了PCN的物相组成和光电性质。结果显示，磷掺杂提高了PCN催化剂的比表面积，降低了光生电子空穴的复合率，拓宽了可见光谱的响应范围，同时提高了催化剂的氧化性能。将PCN用于可见光催化降解抗生素磺胺噻唑（ST）时，其降解速率远高于体相石墨相氮化碳（CN），且60% PCN （60%为甘油磷脂酰胆碱与三聚氰胺的质量比）的效果最好；自由基捕获实验结果显示，羟基自由基（·OH）在整个光催化反应中占主导地位。

关键词: 可见光催化, 石墨相氮化碳, 磷掺杂, 磺胺噻唑

Abstract:

Phosphorus doped graphitic carbon nitride (PCN) was synthesized by the combination of hydrothermal treatment and copolymerization of melamine and glyceryl phosphatidylcholine in this manuscript. To analyze the phase composition and photoelectric properties of as-prepared photocatalysts, X-ray diffraction (XRD), transmission electron microscopy (TEM), X ray photoelectron spectroscopy (XPS), ultraviolet visible diffuse reflectance spectroscopy (UV-vis DRS) and photoluminescence spectrum (PL) were performed. These results show that the P doping increased the specific surface area of PCN photocatalyst, reduced the recombination rate of photo-generated electron-hole pairs, broadened the spectral response range and improved the oxidation properties of PCN photocatalysts. The obtained PCN photocatalysts were used in the visible-light photocatalytic degradation of aqueous sulfathiazole (ST). The degradation rate of aqueous sulfathiazole (ST) over PCN under visible light irradiation was much higher than that over bulk graphitic carbon nitride (CN), and the 60% PCN (where 60% is the mass ratio of glyceryl phosphatidylcholine to melamine) photocatalyst exhibited the best activity. The results of trapping experiment indicate that the hydroxyl radical (·OH) is the dominant active species in the process of photocatalytic reaction.

Key words: visible-light photocatalysis, graphitic carbon nitride, phosphorus doping, sulfathiazole

中图分类号:

X131

唐荣, 丁任丽, 郑诗瑶. 磷掺杂石墨相氮化碳的制备及对磺胺噻唑的可见光催化性能研究[J]. 生态与农村环境学报, 2019, 35(3): 377-384.

TANG Rong, DING Ren-li, ZHENG Shi-yao. Preparation of Phosphorus Doped Graphitic Carbon Nitride and Its Visible-Light Photocatalytic Performance on Sulfathiazole Degradation[J]. Journal of Ecology and Rural Environment, 2019, 35(3): 377-384.

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