反蛋白石结构多孔g-C_(3)N_(4)的制备及光催化性能综合实验

Comprehensive experiment of preparation and photocatalytic performance of porous g-C_(3)N_(4)with inverse opal structure

利用多孔材料的吸附扩散性能与半导体材料的光催化性能的协同效应处理水体污染技术是当前的研究热点之一。首先,以正硅酸四乙酯为硅源,经水解、离心自组装制备的蛋白石结构SiO_(2)胶晶为硬模板剂,单氰胺为前驱体制备了反蛋白石结构多孔g-C_(3)N_(4)材料;其次,利用XRD、SEM、TEM以及氮气吸-脱附等手段对产物进行了表征;最后,以罗丹明B(RhB)为模拟污染物对样品进行光催化降解性能测试,并提出了其光催化作用机理。结果表明:所制备的三维有序大孔g-C_(3)N_(4)样品具有典型的反蛋白石结构形貌;与块状g-C_(3)N_(4)相比,最优原料配比条件下所得反蛋白石结构多孔g-C_(3)N_(4)样品(IOCN-1.0)的比表面积和催化降解RhB的效率均明显提升。该综合实验操作简单且安全高效,不但能锻炼学生的综合实践动手能力,还能培养学生的科研意识和创新思维。

Combining adsorption of porous materials and catalysis technology of semiconductor materials to deal with water pollution is one of the current research hotspots.Firstly,the porous g-C_(3)N_(4) with inverse opal structure is prepared using SiO_(2) colloidal crystal with opal structure synthesized by hydrolysis and centrifugal self-assembly of tetraethyl orthosilicate as hard template and monocyandiamide as precursor.Secondly,the structure and morphology of the products are characterized by XRD,SEM,TEM and N2 adsorption-desorption.Finally,the photocatalytic degradation performance of the samples is tested with RhB as the model compound of pollutants,and the photodegradation mechanism is proposed.The results show that the prepared three-dimensional ordered macroporous g-C_(3)N_(4) samples have typical inverse opal structure,compared to bulk g-C_(3)N_(4),porous g-C_(3)N_(4) with inverse opal structure(IOCN-1.0)under the optimal raw material ratio has larger specific surface area and higher efficiency of catalytic degradation of RhB.The operation of the comprehensive experiment is simple and safe,which could not only train students'comprehensive practical ability,but also cultivate their scientific research consciousness and innovative thinking.