Luo Yanmei, Jia Yiru, Zhang Dexian, Cheng Xinjian
School of Textiles and Garments, Southwest University, Chongqing, China.
School of Geosciences and Info-physics, Central South University, Changsha, China.
Photochem Photobiol. 2016 Jul;92(4):515-22. doi: 10.1111/php.12591. Epub 2016 May 18.
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 Cd(2+) cation solution and S(2-) 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 Cd(2+) and S(2-) 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.
通过静电纺丝技术制备了TiO2 /PVA复合纳米纤维毡。将巯基修饰的TiO2 -SiO2杂化颗粒和PVA溶液通过同轴注射器注入，得到复合纳米纤维毡。将制备好的巯基修饰的TiO2 -SiO2 /PVA复合纳米纤维毡依次浸入Cd(2+)阳离子溶液和S(2-)阴离子溶液中。由此，制备出黄色的TiO2 @CdS/PVA复合纳米纤维毡。通过调整纳米纤维毡浸入Cd(2+)和S(2-)溶液的次数，可得到附着在纳米纤维毡上不同数量的CdS颗粒。巯基修饰的TiO2 -SiO2 /PVA和TiO2 @CdS/PVA复合纳米纤维毡均用于催化模型染料亚甲基蓝的光降解。通过在TiO2颗粒上锚定CdS颗粒，可大大提高光降解性能。在180分钟内光降解效率达到99.2%。此外，纳米纤维毡可回收再利用至少10次。TiO2 @CdS/PVA复合纳米纤维毡在10个循环内的光降解效率仍为68.8%。
