【摘要】 以三聚氰胺、磷钨酸（HPW）为原料SBA-15为模板剂,成功制备了HPW掺杂高比表面积g-C₃N₄。采用傅里叶红外变换（FTIR）光谱、X射线衍射（XRD）光谱、X光电子能谱（XPS）、氮气吸附脱附（BET）、扫描电镜（SEM）、紫外可见（UV-Vis）漫反射光谱、荧光（PL）光谱进行表征。结果表明,比表面积的增加以及HPW的掺杂均能够提高催化剂的光催化性能,降低带隙能,降低光生电子-空穴的复合几率。以罗丹明B（Rh B）为考察对象,对催化剂在氙灯照射下的催化活性以及稳定性进行考察。结果表明,HPW掺杂的高比表面积g-C₃N₄催化活性最高,反应速率常数为0. 0269 min-1,是块状g-C₃N₄的13倍,且循环使用4次后的光降解活性几乎不变。以叔丁醇、对苯醌、乙二胺四乙酸二钠为自由基（·OH）、自由基（·O2-）和空穴（h+VB）的捕获剂,研究了光催化反应机理。更多还原

【Abstract】 Using melamine,phosphotungstic acid（HPW） as raw materials and SBA-15 as template,a series of high specific surface area g-C₃N₄ doped by phosphotungstic acid（HPW） were prepared. The structure of samples were characterized by Fourier-transform infrared（FT-IR）, X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,N2 adsorption-desorption spectrum,scanning electron microscope（SEM）, Transmission electron microscope（TEM）, ultraviolet-visible（UV-Vis）spectroscopy,photoluminescence（PL）. The results indicate that the increase of specific surface area and the doping of HPW can improve the photocatalytic performance,increase the separation rates of the photogenerated electrons and holes. The photocatalytic activity and stability of samples were evaluated by the degradation of rhodamine B（RhB） under xenon lamp. The results indicate that the high specific surface area g-C₃N₄ doped by HPW（CN-3） has the higher activity. The rate constant for CN-3 is 13 times as high as g-C₃N₄ and the reaction rate constant is 0. 0269 min-1. Furthermore,the activity of the CN-3 catalyst is almost unchanged after four cycles. Disodium ethylenediamine,tetraacetate,tert-butyl alcohol,and 1,4-benzoquinone are used as hole（h+VB）,hydroxyl radical（· OH）,and superoxideradical（·O2-） scavengers,respectively,to investigate the possiblemechanism.更多还原