基于共沉积法的高结晶反蛋白石g-C_(3)N_(4)制备及其产氢性能分析

Preparation of highly crystalline inverse opal g-C_(3)N_(4)by co-deposition and analysis of its hydrogen production performance

为获得光催化产氢性能优异的g-C_(3)N_(4),采用共沉积法,通过二氧化硅微球/单氰胺混合溶液制备具有高结晶反蛋白石结构的g-C_(3)N_(4),并通过扫描电镜、X射线衍射仪、红外光谱仪和比表面积及孔径分析仪等表征手段对其结构和形貌进行分析,采用气相色谱仪对其光催化产氢性能进行表征。结果表明:当二氧化硅微球/单氰胺混合溶液的离心速率为5500r/min和单氰胺溶液质量分数为70%时,所制备的高结晶反蛋白石结构的g-C_(3)N_(4)(CN5500-70%)层间距为3.23Å,比表面积为32m^(2)/g,光催化产氢性能显著提升,产氢速率为7217.01μmol/(g·h)。该方法制备的高结晶反蛋白石结构g-C_(3)N_(4)具有良好的结晶性和优异的光催化产氢活性,为g-C_(3)N_(4)基催化材料的实际应用提供参考。

To obtain g-C_(3)N_(4)with excellent photocatalytic hydrogen production activity,in this paper,highly crystalline inverse opal-structured g-C_(3)N_(4)was prepared by co-deposition of silica microspheres/cyanamide in their mixed dispersion.The structure and morphology were analyzed by scanning electron microscopy,X-ray diffraction,infrared spectroscopy,and specific surface area and pore size analysis;the photocatalytic hydrogen production performance was tested by gas chromatography.The results show the interlayer spacing of highly crystalline inverse opal-structured g-C_(3)N_(4)(CN5500-70%)reaches 3.23Åand the specific surface area reaches 32m^(2)/g when the centrifugation rate is set at 5500r/min and the mass fraction of cyanamide solution is 70%.The photocatalytic hydrogen production property is significantly improved with a hydrogen production rate of 7217.01μmol/(g·h).The highly crystalline inverse opal-structured g-C_(3)N_(4)prepared in this paper has good crystallinity and excellent photocatalytic activity simultaneously,which can provide useful reference for the practical application of g-C_(3)N_(4)-based catalytic materials.