双金属掺杂氮化碳光催化降解罗丹明B的研究

Photocatalytic Degradation of Rhodamine B by Bimetallic Doped Carbon Nitride

以三聚氰胺为前驱体,以硝酸铁和硝酸钴为原料,采用热解法制备双金属掺杂石墨相氮化碳(g-C3N4),对其进行傅立叶红外衍射光谱(FT-IR),X射线衍射光谱(XRD),氮气吸附-脱附图谱和电子扫描显微镜(SEM)等表征。结果显示,掺杂双金属并没有改变g-C3N4的晶体结构,且增加了g-C3N4的比表面积。在可见光下以罗丹明B为模型污染物,研究了双金属不同掺杂比例的g-C3N4的光催化降解性能。结果表明,当m(Fe(NO3)3∶m(Co(NO3)2)=8∶1,总质量为0. 01g时,120 min对罗丹明B的降解率达到89. 2%,是纯氮化碳的2倍。由反应动力学可得,其反应速率常数也达到纯g-C3N4的7倍。重复实验观察到催化剂具有较高的稳定性。

Using melamine as precursor,ferric nitrate and cobalt nitrate were used as raw materials to prepare bimetallic doped graphite phase carbon nitride( g-C3N4) by pyrolysis method.The catalysts were characterized by Fourier transform infrared spectroscopy( FT-IR),X-ray diffraction spectroscopy( XRD),isothermal nitrogen adsorption-desorption( BET) and Electronic scanning microscope( SEM). The results showed that the Doped bimetal did not change the crystal structure of g-c3 n4 and increased the specific surface area of g-C3N4. The photocatalytic degradation performance of g-C3N4 with different bimetallic doping ratios was studied by using rhodamine B as a model pollutant under visible light.The results showed that when m( Fe( NO3)3∶ m( Co( NO3)2)= 8 ∶1,the total mass was 0. 01 g,the degradation rate of rhodamine B at 120 min reached 89. 2%,which was 2 times than that of pure gC3N4. According to the reaction kinetics,the reaction rate constant is also 7 times that of pure g-C3N4. Repeated experiments showed that the catalyst had high stability.