碘掺杂g-C3N4光催化剂的制备及催化性能

采用热聚合法，以尿素为前驱体，碘化氨为掺杂剂，制备出不同碘离子掺杂量的可见光催化剂石墨相氮化碳（g C3N4）。对碘掺杂g C3N4催化剂（Ix C3N4）进行X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、傅里叶变换红外光谱（FT IR）、X光电子能谱（XPS）、紫外 可见漫反射（UV Vis）、N2吸附、电子荧光光谱（PL）、电化学阻抗（EIS）等表征，分析了催化剂的形貌、结构、光学和电学性能。以4 硝基苯酚为目标污染物进行光催化降解实验，选取最佳碘掺杂量的I002 C3N4催化剂进行重复性实验。结果表明，碘离子的引入没有改变g C3N4的原始形貌和结构，掺杂后的样品拓宽了g C3N4对可见光的吸收范围，降低了光生电子 空穴对的复合率；掺杂最佳碘离子量的催化剂I002 C3N4在2 h内对4 硝基苯酚的降解率达到84%，重复4次实验后，降解率仍能达到80%。

Preparation and Photocatalytic Activity of Iodine Doping g-C3N4

The visible photocatalysts graphitic carbon nitride with different iodide doping amounts were prepared by thermal polymerization method with urea as precursor and ammonium iodide as dopant. The morphology, structure, optical and electrics properties of the catalysts were analyzed by X ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT IR), X ray photoelectron spectroscope (XPS), UV Vis diffuse reflectance (UV Vis), N2 adsorption, photoluminescence (PL) and electrochemical impedance spectroscopy plots (EIS). The photocatalytic degradation experiment was carried out with p nitrophenol as the target pollutant, and then the optimal doping amount of the catalyst in recycle experiment was investigated. The results show that the introduction of iodide does not change the original morphology and structure of g C3N4, but broadens the absorption range of the visible light and reduces the recombination rate of the photogenerated electron hole pairs, with the degradation rate of p nitrophenol up to 84% in 2 h with the catalyst doped with the best ion content-I002 C3N4. And the degradation rate is still 80% after 4 times recycle experiment.