宽光谱响应的介孔rGO/TiO2空心块体制备及光催化性能

以钛酸四丁酯(TBT)、氧化石墨烯(GO)为原料,酵母菌为空腔模板剂,柠檬酸为水解抑制剂和介孔模板剂,采用溶胶-凝胶法原位合成介孔GO/TiO₂空心块体材料(GO/TiO₂),通过紫外灯辐照还原得到rGO/TiO₂.利用XRD、SEM、BET、PL表征手段对样品进行分析,研究酵母菌的引入对rGO/TiO₂降解盐酸四环素性能的影响.结果表明:样品为介孔空心块体结构,其比表面积为50.66 m²/g,以4.3 nm的介孔为主;酵母菌的加入可抑制催化剂光生电子-空穴对的复合,并拓宽其光谱响应范围,提高光催化性能;当酵母菌质量分数为5%时,rGO/TiO₂的催化性能达到最佳水平,在可见光及紫外光条件下,盐酸四环素的降解率分别达到84.97%、96.96%.

Preparation of mesoporous rGO/TiO2hollow blocks with wide spectral response and photocatalytic performance related with them

Mesoporous graphene oxide/TiO₂ hollow bulk materials were synthesized in-situ with Sol-Gel method, by taking tetrabutyl titanate (TBT) and graphene oxide(GO) as raw materials, yeast as cavity template agent and citric acid as hydrolysis inhibitor and mesoporous template agent, and then the reduced graphene oxide/TiO₂ (rGO/TiO₂) bulk materials were obtained by means of ultraviolet radiation reduction. The samples were analyzed by means of various characterization means such as X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and photoluminescence (PL) and the effect of yeast addition on degradation of tetracycline hydrochloride with rGO/TiO₂ was studied. It was shown by experimental result that rGO/TiO₂ would be mesoporous bulk materials with specific surface area of 50.66 m²/g and mesopores size of 4.3 nm in majority. The addition of yeast could effectively inhibit the recombination of the photo-generated electron-hole pair of catalyst, broaden the spectral response range and improve the photocatalytic performance. When the mass fraction of yeast was 5%, the catalytic performance of rGO/TiO₂ would reach optimal level. Under visible light and ultraviolet light, the degradation rate of tetracycline hydrochloride would reach 84.97% and 96.96%, respectively.