热剥离g-C_(3)N_(4)纳米片的合成及光催化性能研究  

Synthesis and photocatalytic properties of thermally exfoliated g-C3N4 nanosheets

作　　者：柯洋丽[1,2] 朱丽 宋师雯 Ke Yangli;Zhu li;Song Shiwen(Hubei Land and Resources Science Institute of Safety and Health,Wuhan 430072,China;China Geological University,Wuhan 430074,China;The First Affiliated Primary School of Wuhan University,Wuhan 430000,China)

机构地区：[1]湖北国土资源安全卫生科学研究院,武汉430072 [2]中国地质大学,武汉430074 [3]武汉大学第一附属小学,武汉430000

出　　处：《分析仪器》2024年第5期44-51,共8页Analytical Instrumentation

基　　金：国家自然科学基金面上项目:功能型超交联聚合物复合材料吸附浓缩MVOCs的特性与协同作用机理,项目号:52070171。

摘　　要：以三聚氰胺为前驱体,合成块状g-C_(3)N_(4)(CN),再经简单的热剥离技术,成功制备多孔g-C_(3)N_(4)纳米片(CN-S)光催化剂。系统研究了不同热剥离时间对CN-S光催化还原Cr(VI)性能的影响。结果表明:经4 h热剥离后获得的样品CN-S(4h)比表面积和孔体积分别为191.88m^(2)·g^(-1)和1.109cm^(3)·g^(-1),而CN的比表面积和孔体积分别是7.82m^(2)·g^(-1)和0.092cm^(3)·g^(-1),说明热剥离可显著提升材料比表面积和孔体积,增加表面有效活性位点,延长可见光在其内部的多重散射,缩短光生电子-空穴对从材料内部迁移至表面的传输距离。此外,热剥离处理形成的碳空位可增强光生载流子分离效率。由此CN-S(4h)光催化还原Cr(VI)的效率达到99.0%。The bulk g-C_(3)N_(4)(CN)was synthesized using melamine as precursor,and then the porous g-C_(3)N_(4)nanosheets(CN-S)photocatalyst was successfully prepared by a simple thermal exfoliation technique.The effects of different thermal exfoliation time on the performance of CN-S photocatalytic reduction of Cr(VI)were systematically studied.The results showed that the specific surface area and pore volume of the samples undergone thermal exfoliation for four hours(CN-S(4h))were 191.88 m^(2)·g^(-1)and 1.109 cm^(3)·g^(-1),respectively,while the specific surface area and pore volume of CN were 7.82 m^(2)·g^(-1)and 0.092 cm^(3)·g^(-1),respectively.It shows that thermal exfoliation can significantly improve the specific surface area and pore volume of the material,increase the effective active site on the surface,extend the multiple scattering of visible light in its interior,and shorten the transmission distance of photogenerated electron-hole pairs from the interior of the material to the surface.Moreover,the carbon vacancies formed by thermal exfoliation treatment can enhance the light-generated carriers separation efficiency.Thus,the photocatalytic reduction efficiency of Cr(VI)with CN-S(4h)reached 99.0%.

关 键 词：石墨相氮化碳(g-C3N4) 光催化 多孔纳米片 CR(VI) 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TB383.1[一般工业技术—材料科学与工程]