摘要
本研究通过水热合成法和超声法成功构建MoS_(2)/g-C_(3)N_(4)复合型光催化剂。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)以及紫外-可见吸收光谱(UV-Vis)表征技术对复合型催化剂的物理化学特性进行分析。以光催化降解罗丹明B(RhB)为探针反应,探究可见光下不同质量比的MoS_(2)/g-C_(3)N_(4)复合型光催化剂对RhB光催化降解性能的影响。实验结果表明,当MoS_(2)负载量为30%,光催化降解80 min时,10 mg/L的RhB溶液的降解率为96.7%。MoS_(2)/g-C_(3)N_(4)复合催化剂相比于纯的g-C_(3)N_(4),MoS_(2)降解RhB的效果有显著地提高。光催化降解性能的提升归因于两半导体间MoS_(2)和g-C_(3)N_(4)异质结界面构筑,有效地抑制光生电子(e^(-))和空穴(h^(+))的复合,从而提高复合型光催化剂MoS_(2)/g-C_(3)N_(4)的光催化性能。
In this study,hydrothermal synthesis and ultrasonic method were used to construct MoS_(2)/g-C_(3)N_(4) composite catalyst.The structure of the composite catalyst was characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM),infrared spectroscopy(IR)and UV-Vis.The photocatalytic degradation of Rhodamine B(RhB)was investigated by using MoS_(2)/g-C_(3)N_(4) composite catalyst with different mass ratio as a probe.The results showed that the degradation rate of 10 mg/L RhB solution was 96.7%when MoS_(2) load was 30%and photocatalyzed for 80 min.Compared with pure g-C_(3)N_(4),MoS_(2)/g-C_(3)N_(4) composite catalyst significantly improved the degradation effect of MoS_(2) on RhB.The improvement of photocatalytic degradation performance can be attributed to the fact that the heterojunction interface of MoS_(2) and g-C_(3)N_(4) between the two semiconductors effectively inhibits the recombination of photogenerated electrons(e^(-))and holes(h^(⁺)).Finally,by reasoning the photocatalytic degradation mechanism of the composite photocatalyst,the charge transfer mechanism of MoS_(2)/g-C_(3)N_(4) is the same as that of type II heterojunction,so it can be concluded that the composite belongs to type II heterojunction.
作者
廖文政
郑涛
陶珊珊
江昊
杨水金
杨赟
LIAO Wen-zheng;ZHENG Tao;TAO Shan-shan;JIANG Hao;YANG Shuijin;YANG Yun(College of Chemistry and Environmental Engineering,Hanjiang Normal University,Shiyan,Hubei 442000,China;College of Chemistry and Chemical Engineering,Hubei Normal University,Huangshi,Hubei 435002,China)
出处
《井冈山大学学报（自然科学版）》
2024年第3期19-25,共7页
Journal of Jinggangshan University (Natural Science)
基金
国家自然科学基金面上项目(21673069)
国家级大学生创新创业训练计划项目(202416)。
关键词
g-C3N4
纳米片
异质结构
光催化降解
水热法
C_(3)N_(4)
nanosheets
heterogeneous structure construction
photocatalytic degradation
hydrothermal method
