Hu Shaozheng, Li Fayun, Fan Zhiping, Wang Fei, Zhao Yanfeng, Lv Zhenbo
Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun 113001, PR China.
Dalton Trans. 2015 Jan 21;44(3):1084-92. doi: 10.1039/c4dt02658f.
Band gap-tunable potassium doped graphitic carbon nitride with enhanced mineralization ability was prepared using dicyandiamide monomer and potassium hydrate as precursors. X-ray diffraction (XRD), N2 adsorption, UV-Vis spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared catalysts. The CB and VB potentials of graphitic carbon nitride could be tuned from -1.09 and +1.56 eV to -0.31 and +2.21 eV by controlling the K concentration. Besides, the addition of potassium inhibited the crystal growth of graphitic carbon nitride, enhanced the surface area and increased the separation rate for photogenerated electrons and holes. The visible-light-driven Rhodamine B (RhB) photodegradation and mineralization performances were significantly improved after potassium doping. A possible influence mechanism of the potassium concentration on the photocatalytic performance was proposed.
以双氰胺单体和氢氧化钾为前驱体，制备了具有增强矿化能力的带隙可调钾掺杂石墨相氮化碳。采用X射线衍射（XRD）、N2吸附、紫外可见光谱、傅里叶变换红外（FT-IR）光谱、扫描电子显微镜（SEM）、光致发光（PL）和X射线光电子能谱（XPS）对制备的催化剂进行了表征。通过控制钾浓度，石墨相氮化碳的导带和价带电位可从-1.09和+1.56 eV调至-0.31和+2.21 eV。此外，钾的加入抑制了石墨相氮化碳的晶体生长，增大了比表面积，提高了光生电子和空穴的分离速率。钾掺杂后，可见光驱动的罗丹明B（RhB）光降解和矿化性能显著提高。提出了钾浓度对光催化性能的可能影响机制。
