ZnO-TiO_2纳米纤维的制备及亚甲基蓝的太阳光催化降解

Fabrication of ZnO-TiO_2 Nanofibers and Its Photocatalytic Activity to Methylene Blue Solution Under Sunshine

以钛酸四丁酯〔Ti(OC4H9)4〕、硝酸锌和聚乙烯吡咯烷酮(PVP)为原料,采用溶胶-凝胶法和静电纺丝法制备无机有机复合的PVP/ZnO-TiO2纤维,高温焙烧制得直径100～200 nm的ZnO-TiO2纳米纤维。通过差动-热重(DSC-TGA)、傅里叶变换红外光谱(FTIR)、扫描电镜(SEM)等进行了表征,并测定了其对亚甲基蓝溶液的太阳光催化性能。结果表明,w(ZnO)=3%时,ZnO-TiO2纳米纤维对亚甲基蓝催化活性最高,太阳光照射6 h后降解率达99.4%,重复使用8次降解率仍然在95%以上。

PVP/ZnO-TiO2 composite nanofibers were fabricated by a combination of sol-gel and electrospinning methods with Ti （ OC4H9 ）4, Zn （ NO3 ）2 and polyvinylpyrrolidone （PVP） as starting materials. ZnO-TiO2 nanofibers of a diameter of 100 -200 nm were obtained by high temperature calcination of the inorganic organic PVP/ZnO-TiO2 composite fibers. The materials were characterized by means of DSC-TGA, FFIR and SEM. The photocatalytic degradation of methylene blue using ZnO- TiO2 nanofiber as catalyst under sunshine was investigated. The results show that the ZnO-TiO2 nanofiber had the highest photocatalytic activity for methylene blue degradation when the doping mass fraction of ZnO was 3%. The degradation rate of methylene blue solution reached 99. 4% under sunshine for 6 h, and it was still higher than 95% after eight times＇ reuse.