酚醛树脂辅助合成SiO2/TiO2介孔复合微球及其光催化

Phenolic Resin Assisted Synthesis SiO2/TiO2 Mesoporous Microspheres and Photocatalytic Performance

摘要:

利用Stober法合成的纳米SiO2为前体，在酚醛树脂和十六烷基三甲基溴化铵（CTAB）辅助下制备SiO2/TiO2介孔复合微球，并利用XRD、SEM、EDS、BET、BJH及FI-IR等对材料的晶型、形貌以及结构进行了表征，以罗丹明B为目标降解物评价样品的光催化性能。表征结果表明：SiO2/TiO2介孔复合微球是由TiO2和SiO2组成，直径约300 nm，TiO2以纳米薄层方式均匀地沉积在SiO2表面，界面之间存在Si-O-Ti键；SiO2/TiO2介孔复合微球的比表面积为92.3 m2/g，较P25提高了约3倍。光催化评价表明SiO2/TiO2介孔复合微球对罗丹明B的降解率达98%，较P25光催化降解率有明显提高。

Abstract:

Abstract: Nano-SiO2 was used as the matrix synthesised by Stöber method. The phenolic resin and hexadecyl trimethyl ammonium bromide (CTAB) was introduced to prepared SiO2/TiO2 mesoporous composite microspheres. Then the crystal structure, morphology , structure of the materials had been characterized by XRD, SEM, EDS , BET, BJH and FI-IR. Rhodamine B, the target degradation products, was used to evaluate the photocatalytic performance of the samples.The characterization results showed that the SiO2/TiO2 mesoporous composite microspheres were composed of TiO2 and SiO2, about 300 nm in diameter. TiO2 nanometer thin layer was uniformly deposited on the surface of SiO2 with Si-O-Ti bonds existed; The specific surface area of SiO2/TiO2 mesoporous composite microspheres was about 92.3 m2/g , approximately 3 times as big compared with the P25. Photocatalytic evaluation showed that the degradation of Rhodamine B rate for SiO2/TiO2 mesoporous composite microspheres reached 98%, improving significantly compared with P25.