钴掺杂g-C3N4光催化降解盐酸多西环素的性能与机理研究
刘青志 , 刘玉娇 , 王霞 , 符袅 , 邹亚 , 何洁丽
现代化工 ›› 2026, Vol. 46 ›› Issue (3) : 109 -116.
钴掺杂g-C3N4光催化降解盐酸多西环素的性能与机理研究
Photocatalytic degradation of doxycycline hydrochloride by cobalt-doped g-C3N4:Performance and mechanism
以三聚氰胺和六水合硝酸钴作为前驱体,通过高温煅烧-溶剂热法制备不同掺杂比例的Co/g-C3N4纳米材料。粉末X射线衍射(XRD)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、透射电镜(TEM)及稳态光致发光光谱(PL)等表征结果表明,Co以Co2+/Co3+混合价态成功锚定于g-C3N4表面,有效提升了光生载流子的分离效率。当Co掺杂量为0.90%时,材料表现出最优的光催化活性,其对DOH的降解效率常数(k=0.015 8 min-1)较纯g-C3N4(k=0.006 4 min-1)提升2.47倍(准一级动力学拟合)。通过价态分析发现,光催化过程中Co3+被还原为Co2+(Co2+/Co3+比例从1∶0.77变为1∶0.39)。自由基猝灭实验证实·${O}_{2}^{-}$为关键活性氧物种。
Co/g-C3N4 nanomaterials with varied doping ratios were synthesized using melamine and cobalt(Ⅱ) nitrate hexahydrate as precursors through a thermal calcination-solvothermal method.Characterization results obtained from powder X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),Fourier transform infrared spectroscopy (FT-IR),transmission electron microscopy (TEM),and steady-state photoluminescence spectroscopy (PL) demonstrate that cobalt species,predominantly in the mixed Co2+/Co3+ valence states,were successfully anchored onto the surface of g-C3N4,which effectively enhanced the separation efficiency of photogenerated charge carriers.Optimal photocatalytic activity was achieved at Co doping level of 0.90 wt%.The corresponding degradation rate constant for DOH (k=0.015 8 min-1),determined via pseudo-first-order kinetics fitting,was 2.47 times higher than that of pristine g-C3N4 (k=0.006 4 min-1).Valence state analysis revealed that Co3+ was reduced to Co2+ during the photocatalytic process,with the Co2+/Co3+ ratio increasing from 1∶0.77 to 1∶0.39.Radical quenching experiments confirmed that the ·${O}_{2}^{-}$ was the predominant reactive oxygen species.
cobalt-doped graphitic carbon nitride / photocatalytic degradation / doxycycline hyclate
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刘玉娇, 王霞, 许明洋, |
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刘玉娇, 李英萍, 符袅, |
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国家自然科学基金地区基金(22162002)
云南省科技厅基础研究计划项目(202501AT070426)
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