AgBr/TiO2纳米纤维的制备及其光催化性能研究

以钛酸丁酯、聚乙烯吡咯烷酮(PVP)、无水乙醇为原料,利用静电纺丝技术制备出Ti(OC₄H₉)₄/PVP纳米纤维,经500~1 000 ℃高温煅烧制得TiO₂纳米纤维,再通过水热法将AgBr纳米颗粒负载到TiO₂纳米纤维表面。利用X射线衍射仪、场发射扫描电镜、差热-热重分析对AgBr/TiO₂纳米纤维进行表征分析。利用甲基橙(MO)为降解底物模拟染料废水,研究TiO₂、AgBr/TiO₂纳米纤维的光催化性能。分析结果表明,经800 ℃煅烧后的TiO₂纳米纤维,在添加量为100 mg时光催化效果较好;相同条件下,AgBr/TiO₂纳米纤维的光催化降解率高于TiO₂纳米纤维,AgBr/TiO₂纳米纤维对甲基橙的降解率为95.97%。

Preparation and Photocatalytic Properties of AgBr/TiO2 Nanofibers

AgBr/TiO₂ nanofibers were fabricated by a combination of hydrothermal and electrospinning methods. Ti(OC₄H₉)₄/PVP nanofibers were prepared by electrospinning method using Ti(OC₄H₉)₄, PVP and absolute ethanol as raw materials. TiO₂ nanofibers were obtained after calcination at 500 ℃ to 1 000 ℃. AgBr nanoparticles were immobilized on TiO₂ nanofibers under hydrothermal condition. AgBr/TiO₂ nanofibers were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and differential thermo-thermogravimetric (TG-DTA) analysis respectively. The photocatalytic property of TiO₂ and AgBr/TiO₂ nanofibers were studied using methyl orange(MO) as degradation substrate to simulate dye waste water. The results indicate that the TiO₂ nanofibers with the additive amount of 100 mg have better photocatalytic properties after calcined at 800 ℃. The photocatalytic degradation rate of AgBr/TiO₂ nanofibers is found to be higher than that of the TiO₂ nanofibers under the same conditions. The degradation rate of methyl orange by AgBr/TiO₂ nanofibers is about 96%.