热处理时间对钒掺杂钛高炉渣材料性能的影响

采用高温固相法,在800℃不同热处理时间合成了具有钙钛矿型的钒掺杂的含钛高炉渣催化剂(vanadium oxide modifie dtitanium-bearing blast furnace slag,VTBBFS).用X射线衍射(XRD)、扫描电子显微镜(SEM)和紫外可见漫反射光谱对VTBBFS催化剂进行了表征,确定其具有钙钛矿结构;不同的热处理时间并未改变催化剂的晶相组成和表面形貌,但对催化剂的光吸收能力产生较大影响,使催化剂在紫外区域光吸收能明显提高,并发生红移.以白色念珠菌为实验菌种考察VTBBFS催化剂抗真菌能力.结果表明,热处理时间为2h时,VTBBFS催化剂具有较强的抗白色念珠菌能力,在普通光照下杀菌率可达到100%,并具有持续抑菌性能.

Effects of Time for Heat-Treatment on Properties of Vanadium-Doped Titanium-Bearing BF Slag

Perovskite-type vanadium-doped titanium-bearing blast furnace slag (VTBBFS) photocatalyst was prepared by way of high-temperature solid phase method at 800℃ with different time for heat-treatment and it was characterized by XRD, UV-vis absorption spectra and SEM. It was found that the VTBBFS photocatalyst is of perovskite type, and that there is no change found in the crystals structure and surface morphology of the photocatalysts because of different heat-treating time. But, the photoabsorbability of the photocatalyst is thus affected greatly, which enables the UV absorbability of the catalyst to be improved obviously with red shift found. Candida albicans was used as experimental bacterin to check the antifungal ability of VTBBFS photocatalyst. The results showed that VTBBFS photocatalyst has good resistance against Candida albicans if heat-treated for 2 h, and its sterilizing rate will come up to 100% under common illumination with sustainable bacteriostasis provided.