WO3/g-C3N4复合催化剂的制备及其可见光 光催化性能分析

在盐酸质子化条件下，采用超声微波协助法成功制备了可见光型复合催化剂WO3／g-C3 N4。利用X射线多晶粉末衍射仪（XRD）、扫描电镜（SEM）、透射电镜（TEM）、紫外可见漫反射（UV-Vis）和BET比表面测试仪对样品进行了表征，并以罗丹明B（RhB）为目标降解物对其光催化性能进行研究。结果表明：复合催化剂样品是由片状的 WO3纳米片负载在g-C3 N4表面组成的。当 WO3负载的质量分数为40％时，前驱物在500℃条件下煅烧2 h后所得样品的光催化性能明显好于同条件下制得的单一相 WO3和g-C3 N4，在可见光（波长大于420 nm）照射下，5 h 内对100 mL浓度为10－5 mol／L罗丹明B橙溶液的降解高达98％。

Synthesis and visible-light photocatalytic activity of WO3/g-C3N4 composite photocatalysts

The WO3/g-C3 N4 composite visible photocatalysts were successfully synthesized by an ultrasound-microwave-protonation process using HCl solution as solvent.The prepared samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS)and Brunauer-Emmett-Teller (BET )specific surface area and photogradation of Rhodamine B (RhB )for visible-light properties.This results show that the composite catalysts are composed of WO3 nanosheets loading on g-C3 N4 nanoplates.When the mass fraction of WO3 is 40%,the sample prepared by heating the precursor at 500 ℃ for 2 h has better photocatalytic activity than that prepared by pure WO3 and g-C3 N4 .The WO3/g-C3 N4 can photodegradate 98% 100 mL RhB solution with concentration of 10-5 mol/L after 5 h visible-light (wavelength is larger than 420 nm)irradiation.