水热法制备α-FeOOH/MoS_2纳米片复合物及其光催化性能

Synthesis and Visible Light Photocatalytic Performance ofα-FeOOH/MoS_2 Nanosheet Composite Photocatalyst

采用水热法成功制备了棒状α-FeOOH/MoS_2纳米片复合催化剂。运用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-Vis)和荧光发射光谱(PL)对复合催化剂的结构和形貌进行了表征。结果表明:成功制备了长度为500nm左右的纳米棒状α-FeOOH,其与MoS_2纳米片形成良好的复合结构。以亚甲基蓝为模拟污染物,研究复合催化剂在可见光照射下的光催化特性。结果显示,棒状α-FeOOH/MoS_2纳米片复合催化剂在120min内对亚甲基蓝的降解率为98%,其降解动力学常数是纯α-FeOOH的3倍。根据活性基捕获实验结果,提出了α-FeOOH与MoS_2纳米片形成异质结的Z型光催化机理。

Theα-FeOOH/MoS2 nanosheet composite photocatalyst was successfully prepared by a hydrothermal method.The structure of composite photocatalyst was characterized by using X-ray diffraction（XRD）,scanning electron microscopy（SEM）,UVvis diffuse reflectance spectroscopy（DRS）and photoluminescence spectroscopy（PL）.The results indicated thatα-FeOOH nanorod（500 nm）were successfully coupled into the surface of MoS2 nanosheet.The photocatalytic activity of composite photocatalyst was evaluated by the degradation of organic methylene blue（MB）under visible light irradiation.The obtainedα-FeOOH/MoS2 nanosheet composite photocatalyst exhibited the optimal photocatalytic performance,which can degrade 98% under visible-light irradiation within 120 min.The kinetic constant of MB degradation withα-FeOOH/MoS2 nanosheet composite photocatalyst was about 3 times as high as that of the pureα-FeOOH.According to the activity of radical trapping experiments,the mechanism of Z type photocatalyticα-FeOOH/MoS2 nanosheet heterojunction was proposed.