石墨相氮化碳的制备及光催化降解罗丹明B

研究了不同前驱体组合对制备光催化剂的影响,通过X-射线衍射分析、红外光谱分析、氮气吸附-脱附等温曲线、光学性质分析和紫外-可见漫反射等方法,对光催化剂性质进行表征。结果表明:以质量比为1∶1的C2H4N4/CON2H4组合前驱体制备的光催化剂表现出结晶度好、光生载流子分离效率高、催化剂性能稳定等特点；C2H4N4/CON2H4组合前驱体制备的g-C3N4光催化反应180 min后对RhB的去除率最高；通过添加异丙醇、苯醌和EDTA对光催化过程中产生的活性物质进行分析发现,超氧自由基和空穴是降解RhB的主要活性物质。

Preparation of graphite carbon nitride for photocatalytic degradation of RhB

Different combinations of precursors were used to synthesis the photocatalyst in this experiment. The characteristics of photocatalysts were investigated by X-ray diffraction, fourier transform infrared, N2 adsorption-desorption isotherm, photoluminescence and UV-vis diffuse reflection spectroscopy. Comparing the photocatalysts generated by different combinations of the precursors, the photocatalyst prepared by C2H4N4/CON2H4 precursors at the mass ratio of 1∶1 showed good crystalline, high separation of photogenerated electrons and holes, and good stability. The removal efficiency of RhB with g-C3N4 prepared by C2H4N4/CON2H4 precursors was the highest after 180 min photocatalytic reaction. The main oxidative species for photocatalytic degradation of RhB were also detected by adding IPA, BQ and EDTA. The result suggested that the ·O-2 and holes were mainly responsible for the degradation of RhB.