SiO_(2)/g-C_(3)N_(4)复合粉体制备及其光催化性能  

Synthesis and Photocatalytic Properties of SiO_(2)/g-C_(3)N_(4) Composite Powders

作　　者：徐泽忠 邹慧 曹显志 吴阳 韩成良[4] XU Zezhong;ZOU Hui;CAO Xianzhi;WU Yang;HAN Chengliang(Analysis and Testing Center of Hefei University,Hefei 230601,China;College of Materials Science and Engineering,Southeast University,Nanjing 211189,China;College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310006,China;Department of Chemical and Materials Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]合肥学院分析测试中心,合肥230601 [2]东南大学材料科学与工程学院,南京211189 [3]浙江工业大学化学工程学院,杭州310006 [4]合肥学院能源材料与化工学院,合肥230601

出　　处：《硅酸盐通报》2021年第8期2748-2754,共7页Bulletin of the Chinese Ceramic Society

基　　金：2018年合肥学院自然科学发展基金重点项目(18ZR08ZDB)。

摘　　要：以St ber法制备出的二氧化硅(SiO_(2))微球和三聚氰胺为原料,两者按一定质量比混合后得到前驱体,通过煅烧该前驱体可成功获得SiO_(2)/g-C_(3)N_(4)复合粉体。利用XRD、SEM、UV-Vis和BET等表征手段对获得的复合粉体进行物相组成、形貌、可见光吸收性能以及比表面积大小等进行分析和测试。结果表明,改进的Stober法制备出的球形SiO_(2)平均粒径约为200 nm,具有良好的分散性。SiO_(2)/g-C_(3)N_(4)复合粉体中SiO_(2)含量约为75%(质量分数)时,其比表面积最大,约为23.7 m^(2)/g。同时,以罗丹明B和亚甲基蓝为目标污染物,在可见光照射下,探究了不同g-C_(3)N_(4)负载量SiO_(2)/g-C_(3)N_(4)复合粉体的光催化性能。结果表明,随着复合粉体中g-C_(3)N_(4)含量的降低,复合粉体的可见光催化活性反而逐渐升高,g-C_(3)N_(4)含量约为25%(质量分数)时复合粉体光催化降解罗丹明B和亚甲基蓝效果最好。原因可归结为,复合粉体的强吸附增强了可见光催化性能。SiO_(2)/g-C_(3)N_(4)composite powders were successfully prepared by calcination of proper as-prepared silicon dioxide(SiO_(2))and melamine(C_(3)H_(6)N_(6))composite precursors.The phase composition,morphology,optical absorption performance,and specific surface area of the composite powders were carried out by X-ray diffraction(XRD),field emission scanning electron microscope(FE-SEM),ultraviolet-visible light absorption spectrum(UV-Vis)and BET method.Results show that the average particle size of spherical SiO_(2)prepared by modified St ber method is about 200 nm and it has good dispersibility.When the content of SiO_(2)is about 75%(mass fraction)in SiO_(2)/g-C_(3)N_(4)composite powder,the specific surface area of composite powder is the largest,about 23.7 m^(2)/g.At the same time,the photocatalytic properties of SiO_(2)/g-C_(3)N_(4)composite powders with different g-C_(3)N_(4)loading content were investigated under visible light irradiation with Rhodamine B and methylene blue as the target pollutants.Results indicate that with the decrease of the content of g-C_(3)N_(4)in the composite powders,the visible light activity of the composite powder increases gradually.The composite powder with about 25%(mass fraction)g-C_(3)N_(4)has the best photocatalytic degradation effect on Rhodamine B and methylene blue.The reason is that the strong absorption of composite powders enhances the visible light photocatalytic property.

关 键 词：SiO_(2)/g-C_(3)N_(4)复合粉体 光催化 Stober法 吸附 

分 类 号：TQ034[化学工程]