多形貌g-C_(3)N_(4)的制备及其光催化性能的研究  

Preparation of g-C_(3)N_(4) with particular morphology and their application for pollutant degradation

作　　者：卫邦琪 冉国侠 宋启军 王婵 WEI Bang-qi;RAN Guo-xia;SONG Qi-jun;WANG Chan(School of Chemical&Material Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《应用化工》2022年第1期33-38,共6页Applied Chemical Industry

基　　金：国家自然科学基金(51973083);中国博士后科学基金资助项目(2019M651688)。

摘　　要：采用调控块状石墨相氮化碳(g-C_(3)N_(4))的微观形貌来增加比表面积是提高其光催化性能的有效方法。利用不同溶剂的导向作用将前驱体组装成超分子聚集体,并在熔融盐介质中煅烧,成功制备了锥形、花状、珊瑚状和多孔球形形貌的g-C_(3)N_(4)。通过红外光谱、全自动比表面积测定、荧光光谱和紫外-可见漫反射光谱分析其结构,并进行光催化性能评价。结果表明,相对于块状g-C_(3)N_(4),多形貌g-C_(3)N_(4)均引入了氰基基团,并增大了比表面积,拓宽了可见光吸收范围。由于光生载流子的复合被抑制,多形貌g-C_(3)N_(4)对罗丹明B的降解效率明显高于块状g-C_(3)N_(4),其中锥形g-C_(3)N_(4)的降解性能最好,经5次循环后,降解性能仍达到90%。Construction of particular morphology of carbon nitride(g-C_(3)N_(4)) to provide large specific surface area is an effective way to accelerate its photocatalytic performance.Melamine and cyanuric acid were assembled by the direction-induced function of solvent,and then the products were calcinated in the presence of inorganic salts.The resultant g-C_(3)N_(4) presented different ordered structures,depending on the solvent from which it was mixed.The FTIR,BET,PL and DRS analyses its structure,and the photocatalytic performance was evaluated.The result showed that relative to the g-C_(3)N_(4) leading to enlarge the specific surface area and increase the absorption range of visible light.In all cases,the g-C_(3)N_(4) exhibited superior photocatalytic activity compared to the bulk material on the account of the inhibition of recombination of photogenerated carriers,in particular,the hollow spindle-like g-C_(3)N_(4) exhibits highest stability and efficiency(more than 90%)for the degradation of Rhodamine B(RhB)dye even after 5 consecutive runs.

关 键 词：石墨相氮化碳 溶剂 盐介质 形貌调控 光催化 罗丹明B 

分 类 号：TQ032[化学工程] TQ034