Preparation of Fe-Doped Graphitic Carbon Nitride with Enhanced Visible-Light Photocatalytic Activity

Abstract

摘要: 以硝酸铁和三聚氰胺为原料制备不同含铁量的 Fe 掺杂石墨氮化碳(g-C3N4). 采用 X 射线衍射光谱 (XRD)、 紫外-可见(UV-Vis)光谱、 傅里叶变换红外(FT-IR)光谱、 电感耦合等离子体-原子发射光谱(ICP-AES)、 荧 光(PL)光谱、 X 光电子能谱(XPS)等分析手段对制备的催化剂进行了表征. 结果表明, 铁以离子形式镶嵌在 g-C3N4的结构单元中, 影响了 g-C3N4的能带结构, 增加了 g-C3N4对可见光的吸收, 降低了光生电子-空穴对的复合 几率. 以染料罗丹明 B 的降解为探针反应系统研究了不同含铁量对 g-C3N4在可见光下催化性能的影响. 结果表 明, m(Fe)/m(g-C3N4)=0.14%时, 制备的 Fe 掺杂 g-C3N4表现出最佳的光催化性能, 120 min 内罗丹明 B 的降解 率高达 99.7%, 速率常数达到 0.026 min-1 , 是纯 g-C3N4的 3.2 倍. 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.

Oxygen-doped Carbon Nitride Nanocages with Efficient Photon-to-Electron Conversion for Selective Oxidation of Xylose/Xylan to Yield Xylonic Acid

“…Furthermore, elements doping is a simple and effective way to enhance the photon-to-electron conversion rate. To date, non-metallic elements such as C [14] , N [15] , O [16] , P [17] , S [18] , B [15] , F [19] , I [20] and metal elements, such as Fe [21] , Co [22] , Ni [23] , Zn [24] , Mn [25] , have been investigated, and great progresses also have been achieved. Amongst, O-doping is an economic and effective measure, which can be obtained by direct calcination in air.…”