摘要
利用高热稳定性介孔TiO2粉体,采用室温冷冻干燥法制备了一种漂浮型二氧化钛陶瓷光催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附脱附等方法对陶瓷的结构进行表征。结果表明,所制备的漂浮型二氧化钛陶瓷具有大孔/介孔的分级孔结构,并且TiO2陶瓷在800℃焙烧条件下仍然能够保持锐钛矿相。对浓度为15 mg·L-1的模拟污染物亚甲基蓝(MB)进行了光催化降解研究,其去除率可达到92.2%。催化剂在循环使用6次后,降解效果依然在92%以上。另外,采用该催化剂降解罗丹明B(RhB)、甲基橙(MO)和苯酚(PhOH),去除率可以分别达到92.7%、90.2%和94.6%,表明所制备的漂浮型分级孔二氧化钛陶瓷光催化剂在实际废水处理中将有很好的应用前景。
A novel floating TiO2 hierarchical pore ceramic photocatalyst was successfully synthesized using thermally-stable, mesoporous anatase TiO2, followed by a camphene-based freeze-casting process. The structures of the prepared mesoporous TiO2 were characterized in detail by X-ray diffraction （ XRD）, scanning electron microscope （SEM） and N2 adsorption/desorption isotherms. The experimental results showed that the preparation of the floating macroporous/mesoporous titania ceramics exhibited hierarchical pore structure, and TiO2 ceramics at 800 ~C calcination conditions could still keep the anatase phase. Effect of photocatalytic degradation for 15 mg~ L-~ pollutants methylene blue （MB） was inspected in the experiment, and the results showed that the removal efficiency could reach 92.2%. After the recycled catalyst was used for six times, the MB removal efficiency can remain above 92%. In addition, the pho- tocatalytic degradation efficiencies of rhodamine B （ RhB ）, methyl orange （ MO ） and phenol （ PhOH ） can reach 92.7%, 90. 2% and 94.6%, respectively. It indicated that this floating photocatalyst TiO2 ceramics would have a good application prospect in practical wastewater treatment.
出处
《黑龙江大学自然科学学报》
CAS
北大核心
2014年第1期106-111,共6页
Journal of Natural Science of Heilongjiang University
基金
黑龙江省教育厅科学技术研究项目(12511382)
