WO_3/g-C_3N_4复合催化剂的制备及其可见光光催化性能分析

Synthesis and visible-light photocatalytic activity of WO_3/g-C_3N_4 composite photocatalysts

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-C3N4。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-C3N4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2h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-C3N4,在可见光(波长大于420nm)照射下,5h内对100mL浓度为10-5 mol/L罗丹明B橙溶液的降解高达98%。

The WO3/g-C3N4 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 BrunauerEmmett-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-C3N4 nanoplates.When the mass fraction of WO3 is 40%,the sample prepared by heating the precursor at500 ℃for 2hhas better photocatalytic activity than that prepared by pure WO3 and g-C3N4.The WO3/g-C3N4 can photodegradate 98% 100 mL RhB solution with concentration of 10-5 mol/L after 5hvisiblelight（wavelength is larger than 420nm）irradiation.