超声-冷冻干燥法制备g-C3N4纳米片及其光催化降解性能研究  

Preparation of g-C3N4 nanosheets by ultrasonic-freeze drying method and performance of photocatalytic degradation

作　　者：王鹏 李政东 薛锦 周颖梅[1] 李昭[1] Wang Peng;Li Zhengdong;Xue Jin;Zhou Yingmei;Li Zhao(School of Chemistry and Chemical Engineering,Xuzhou Institute of Technology,Xuzhou 221018)

机构地区：[1]徐州工程学院化学化工学院

出　　处：《化工新型材料》2019年第12期109-112,116,共5页New Chemical Materials

基　　金：江苏省自然科学基金青年项目（BK20180178）;徐州市科技计划项目（KC18010、KC19056）;徐州工程学院校级科研项目（XKY2018226）;徐州工程学院高等教育科学研究课题（YGJ1954）

摘　　要：采用全新的超声-冷冻干燥法对焙烧所得块状石墨相氮化碳(g-C3N4)进行处理,以期改善其分散性,获得高活性的纳米片状结构g-C3N4。通过XRD、SEM、IR、BET、UV-Vis等表征手段对系列样品的形貌、结构、能带间隙等特点进行研究,并在可见光下考察了催化剂对罗丹明B的降解效果。研究结果表明,经超声-冷冻干燥处理后的样品,其催化降解速率是块状g-C3N4样品的3.08倍,表明冷冻干燥对优化催化剂结构,提升催化降解性能具有重要作用。Graphite carbon nitride has become research hotspot in the field of photocatalysis and photocatalytic materials.Ultrasonic-freeze drying method was used to modify the bulk g-C3N4 which was prepared by high temperature pyrolysis,and g-C3N4 nanosheets were prepared by this new method.The morphology,structure and energy band gap of catalysts were characterized by XRD,SEM,IR,BET and UV-Vis.Furthermore,the photocatalytic degradation of rhodamine B solution was performed under visible light irradiation.According to the results,the sample prepared by ultrasonic-freeze drying method showed higher photocatalytic degradation efficiency of rhodamine B,the degradation efficiency was 3.08 times as much as the bulk g-C3N4.Therefore,freeze drying likely played an important role in determining the optimization of catalyst structure and improvement of catalytic performance.

关 键 词：g-C3N4 冷冻干燥 剥离 纳米片 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]