Au/N-g-C_(3)N_(4)复合材料的制备及其可见光催化产氢性能

Preparation of Au/N-g-C_(3)N_(4)composite and its visible light catalytic hydrogen production

首先以尿素和柠檬酸作为前驱体,通过热处理工艺合成N掺杂的g-C_(3)N_(4)(N-g-C_(3)N_(4)),然后利用化学还原的方法将Au沉积到N-g-C_(3)N_(4)表面,形成Au修饰的N掺杂的g-C_(3)N_(4)复合光催化材料(Au/N-g-C_(3)N_(4))。通过XRD、XPS、TEM、UV-Vis和光电流测试对其进行了表征,与同等条件下制备的N-g-C_(3)N_(4)和g-C_(3)N_(4)相比,Au/N-g-C_(3)N_(4)具有更强的光吸收性能和更大的光电流。同时对材料的可见光产氢性能进行了研究,结果发现:当Au含量为1%时,复合材料呈现最佳的光催化产氢性能,其产氢速率为974μmol·g^(-1)·h^(-1),为N-g-C_(3)N_(4)(15μmol·g^(-1)·h^(-1))的65倍。

Firstly,N-doped g-C_(3)N_(4)(N-g-C_(3)N_(4))was synthesized by heat treatment with urea and citric acid as precursors.Then,Au was deposited on the surface of N-g-C_(3)N_(4)by chemical reduction.It was characterized by XRD、XPS、TEM、UV-Vis and photocurrent test.Compared with N-g-C_(3)N_(4)and g-C_(3)N_(4)prepared under the same conditions,Au/N-g-C_(3)N_(4)has stronger light absorption and larger photocurrent.At the same time,the hydrogen production performance of the composite was studied under visible light.The results showed that modification of N-g-C_(3)N_(4)with Au(1.0 wt%loading)exhibited the highest photocatalytic hydrogen production rate(974μmol·g^(-1)·h^(-1)),which is 65 times that of N-g-C_(3)N_(4)(15μmol·g^(-1)·h^(-1)).