摘要
分别以硫脲、尿素和三聚氰胺作为g-C3N4前驱体,采用浸渍法和退火处理将g-C3N4负载在TiO2纳米花上制备g-C3N4/TiO2异质结光催化材料。研究不同g-C3N4前驱体对g-C3N4/TiO2光催化材料形貌、光电化学性能及光催化分解水产氢性能的影响。结果表明:以硫脲和尿素为g-C3N4前驱体时,TiO2纳米花结构被破坏,所得到的g-C3N4/TiO2复合材料比表面积较小,光生载流子复合严重,光催化活性较低;以三聚氰胺为g-C3N4前驱体时,TiO2仍然保持完整的纳米花结构,所得到的g-C3N4/TiO2复合材料在保持较高的比表面积的同时具有较低的光生载流子复合速率,因此该复合材料的光催化性能显著增强,在模拟太阳光照射下分解水产氢速率高达20.75mmol/(g·h)。
Thiourea,urea and melaminewere used as the g-C3N4precursors respectively to prepare g-C3N4/TiO2 heterojunction photocatalytic materials by loading g-C3N4 on TiO2 nanoflowers with impregnation method and annealing method.The effects of different g-C3N4 precursors on the morphology,photo-electrochemical properties and photocatalysis-based hydrogen producing property of g-C3N4/TiO2photocatalytic materials were investigated.The results showed that,when thiourea and urea were used as g-C3N4precursors,the heterojunction of TiO2nanoflowers was destroyed,and the specific surface area of g-C3N4/TiO2 composites was low.The photon-generated carrier recombination was serious,and photocatalytic activity was low.When melamine was used as the g-C3N4precursor,TiO2 still kept complete nanoflower heterojunction.The g-C3N4/TiO2composite obtained had low photongenerated carrier recombination rate while maintaining high specific surface area.Thus,photocatalytic performance of the composite was enhanced significantly.Hydrogen production rate by water splitting under simulated sunlight exposure was as high as 20.75mmol/(g·h).
作者
闫玉梅
钱德桂
崔灿
YAN Yumei;QIAN Degui;CUI Can(School of Sciences,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2019年第6期755-762,共8页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
大学生创新创业训练计划项目(201710338012)
新苗人才计划项目(2017R406029)
关键词
g-C3N4
TIO2
光催化
异质结
光解水
g-C3N4
TiO2
photocatalysis
heterojunction
photocatalytic water splitting
作者简介
闫玉梅(1989-),女,河南周口人,硕士研究生,主要从事光催化材料方面的研究;通信作者:崔灿,E-mail:cuican@zstu.edu.cn。
