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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%。
With the help of double templates, TiO 2 @ C composite microspheres were prepared under hydrothermal conditions and mesoporous TiO 2 hollow microspheres were obtained after calcination at high temperature. The crystal structure, morphology and pore structure of the prepared samples were characterized by XRD, SEM, TEM and nitrogen adsorption-desorption. The prepared mesoporous TiO 2 hollow microspheres belong to anatase type and are formed by a large number of mesoporous primary microspheres with a diameter of 15.31 nm. The integral microspheres have a diameter of about 360 nm. Adding glucose as a template agent can make the pore structure Become orderly. Rhodamine B was taken as a simulated pollutant to investigate the photocatalytic degradation of rhodamine B by mesoporous TiO2 hollow microspheres. The results showed that under the irradiation of 20 W UV light, 50 mg mesoporous TiO 2 hollow microspheres could completely degrade rhodamine B with an initial concentration of 10 mg / L within 30 min, reused for 11 times, and at 50 min The degradation rate is still up to 89.5%.