Coaxial Electrospinning Method for the Preparation of TiO2@CdS/PVA Composite Nanofiber Mat and Investigation on its Photodegradation Catalysis

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• 作者：Yanmei Luo ; Yiru Jia ; Dexian Zhang and Xinjian Cheng
• 刊名：Photochemistry and Photobiology
• 出版年：2016
• 出版时间：July/August 2016
• 年：2016
• 卷：92
• 期：4
• 页码：515-522
• 全文大小：807K
• ISSN：1751-1097

文摘

TiO₂/PVA composite nanofiber mat was prepared via an electrospinning technology. SH-TiO₂-SiO₂ hybrid particles and PVA solution were injected through a coaxial syringe, yielding a composite nanofiber mat. The as-prepared SH-TiO₂-SiO₂/PVA composite nanofiber mat was immersed in Cd²⁺ cation solution and S²⁻ anion solution in turn. Thus, yellow TiO₂@CdS/PVA composite nanofiber mats were prepared. By adjusting the number of times a mat was immersed in the Cd²⁺ and S²⁻ solutions, different amounts of CdS particles attaching to the mats were obtained. Both SH-TiO₂-SiO₂/PVA and TiO₂@CdS/PVA composite nanofiber mats were employed to catalyze the photodegradation of a model dye, methylene blue. The photodegradation performance could be greatly enhanced by the introduction of CdS particles anchoring onto TiO₂ particles. The photodegradation efficiency reached 99.2% within 180 min. Also, the nanofiber mat could be recycled and reused at least 10 times. The photodegradation efficiency of TiO₂@CdS/PVA composite nanofiber mats remained 68.8% for 10 cycles.