Li Yuan, Sun Xinying, Chen Jiajia, Luo Shuping, Li Guohua
College of Chemical Engineering, Zhejiang University of Technology, China.
State Key Laboratory of Green Chemistry Synthesis Technology, China.
Heliyon. 2024 Dec 20;11(1):e41415. doi: 10.1016/j.heliyon.2024.e41415. eCollection 2025 Jan 15.
Titania (TiO) is one of promising photo catalysts for its high ability to resistant photo corrosion and environmental friendliness, but its photocatalytic activity is too low to be used in industry. To find an approach to solve this problem, graphene oxide (GO), tungsten trioxide (WO) and TiO composite with hollow mesoporous structure was prepared by a two-step spray drying method. The composite was used as raw material to constitute a membrane onto ITO glass to form a membrane photo-anode. In this way, its photo-electrocatalytic property was tested. The morphology, crystal phase, microstructure and specific surface area of the composite were characterized by SEM, XRD, TEM and BET, respectively. The surface potential distribution and optical property of the anode were measured by a Kelvin Probe Force Microscopy and a Fs-5 Steady-State Fluorescence Spectrometer, respectively. The forbidden bandwidth of the GO-WO/TiO composite is 2.30 eV, which is much lower than that of the WO/TiO composite, 2.92 eV. When the content of GO in the anode is around 1 wt%, its light absorption ability is the best among all the anodes with different contents of GO, and its photocatalytic ability to degrade methyl orange is the strongest as our experiments concerned. These findings indicate that the addition of GO into the WO/TiO composite can improve its photo-electrocatalytic property. The construction of membrane photo-anode is an efficient approach to solve the problem of the recovery and secondary utilization of nanoscale powder in water treatment.
二氧化钛（TiO₂）因其具有高抗光腐蚀能力和环境友好性，是一种很有前景的光催化剂，但其光催化活性过低，无法应用于工业。为找到解决这一问题的方法，采用两步喷雾干燥法制备了具有中空介孔结构的氧化石墨烯（GO）、三氧化钨（WO₃）与TiO₂的复合材料。该复合材料被用作原料，在ITO玻璃上制成膜，形成膜光阳极。通过这种方式，对其光电催化性能进行了测试。分别采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、透射电子显微镜（TEM）和比表面积分析仪（BET）对复合材料的形貌、晶相、微观结构和比表面积进行了表征。分别用开尔文探针力显微镜和Fs-5稳态荧光光谱仪测量了阳极的表面电位分布和光学性质。GO-WO₃/TiO₂复合材料的禁带宽度为2.30 eV，远低于WO₃/TiO₂复合材料的2.92 eV。当阳极中GO的含量约为1 wt%时，在所有不同GO含量的阳极中，其光吸收能力最佳，且在我们的实验中，其降解甲基橙的光催化能力最强。这些发现表明，在WO₃/TiO₂复合材料中添加GO可以提高其光电催化性能。构建膜光阳极是解决水处理中纳米级粉末回收和二次利用问题的有效途径。
