【摘要】 应用乙醚萃取法制备了Fe单晶取代的Keggin型磷钨酸盐(PW₁₁Fe),并成功负载于石墨相氮化碳（g-C₃N₄）,制备了不同掺杂量的复合催化剂。采用FTIR,XRD,XPS,UV-Vis,EIS,PL对催化剂进行表征。结果表明:PW₁₁Fe的掺杂有效地调控了g-C₃N₄的能级结构。并且能够有效降低光生电子空穴的复合几率,拓宽了光的响应范围,其中当掺杂量为15%（0. 15CN）时表征结果最佳。以罗丹明B（Rh B）为反应探针,在500 W氙灯（配420 nm滤光片）照射下考察催化剂的反应活性及稳定性。结果表明:负载PW₁₁Fe后显著提高了g-C₃N₄对于反应底物的吸附性能以及反应活性。0. 15CN表现出最佳的反应活性,光照90 min降解率达到100%,反应速率常数为0. 042 66 min^-1,是纯g-C₃N₄的21. 9倍。当循环使用4次后,催化活性几乎不变。更多还原

【Abstract】 Fe substituted heteropoly acid potassium with Keggin type( PW₁₁ Fe) was synthesized by extraction method with ether and loading on g-C₃N₄ to composite catalysts with different amounts. The structure of catalysts was characterized by FTIR spectroscopy,XRD,XPS,UV-Vis,EIS and PL. The results indicate that the band gap of g-C₃N₄ is effectively controlled by doping of PW₁₁ Fe. In addition,it reduces the recombination probability of the photogenerated electrons and holes,and broadens the response range of light. Among them,when the doping amount was 15%（ 0. 15 CN）,the best result was obtained. The catalytic activity and stability of the catalysts were tested in the photocatalytic degradation of RhB under xenon lamp with 420 nm filter. The results show that doping of PW₁₁ Fe can significantly improve the adsorption performance and reactivity of g-C₃N₄. The best reactivity occurs at 0. 15 CN,and the degradation rate reaches 100% after 90 min illumination. The reaction rate constant of 0. 15 CN was 0. 042 66 min^-1,which is 21. 9 times that of pure g-C₃N₄. The catalytic activity is almost unchanged after using 4 times.更多还原