介孔TiO_2中空微球的制备及其光催化性能研究

采用双模板辅助,在水热条件下制备出TiO_2@C复合微球,高温煅烧除去模板后得到介孔TiO_2中空微球。利用XRD、SEM、TEM和氮气吸脱-脱附仪对所制备样品的晶体结构、形貌及孔结构进行表征。所制备的介孔TiO_2中空微球属于锐钛矿型,是由大量直径为15.31 nm的介孔初级微球堆积而成,整体微球直径约为360 nm,加入葡萄糖作为模板剂能使孔道结构变得有序。以罗丹明B为模拟污染物,探讨了介孔TiO_2中空微球光催化降解罗丹明B的性能。结果表明,在20 W紫外光照射下,50 mg介孔TiO_2中空微球在30 min内可使初始质量浓度为10 mg/L的罗丹明B完全降解,重复使用11次,在50 min时的降解率仍可达89.5%。

Preparation and Photocatalytic Properties of Mesoporous Hollow TiO2 Microspheres

TiO2 mesoporous hollow microspheres (MHMs) were prepared by double-template method via calcinating percussive TiO2@C spherical composites that were hydrothermally prepared.As-obtained products were characterized XRD,SEM,TEM,and nitrogen adsorption-desorption apparatus to reveal the crystal structure and morphology.Results showed that the TiO2 MHMs are in anatase phase,constructed by large amount of mesoporous primary microspheres whose diameter is 15.31 nm.The overall diameter of TiO2 MHMs is about 360 nm.Adding glucoses as template can result in ordered pore structure.Photocatalytic degradation of Rhodamine B was conveyed as the probe reaction to evaluate the photocatalytic activity of TiO2 MHMs.Results showed that Rhodamine B (10 mg/L) could be completely degraded in 30 min under ultraviolet light irradiation (20 W) using 50 mg mesoporous hollow TiO2 microspheres.As-made TiO2 MHMs can be recyclable,the degradation rate still reached 89.5％ at the 11th use.