锶磁性光催化剂的制备和表征

Preparation and characterization of strontium magnetic photocatalyst

以自制碳酸锶(SrCO3)和钛酸丁酯为原料,采用超声波技术制备了以锶铁氧体(SrFe12O19)为载体的锶磁性光催化剂(TiO2-SrFe12O19)。采用XRD、IR、VSM、N2吸附实验等手段研究了催化剂的表面性质和磁学特性。结果表明,该催化剂的平均晶粒尺寸在20～30nm之间,比表面积为44.8m2/g,平均孔径为7.09nm,属于介孔磁性材料;饱和磁化强度(Ms)为12.9A.m2/kg,矫顽力(Hc)为120.9kA/m,易于磁分离和重复利用。催化剂对亚甲基蓝(MB)的催化降解脱除率为94.7%,且重复使用3次,催化降解效率不低于88%,表明催化性能稳定,重复使用效果良好。

Strontium magnetic photocatalyst （TiO2-SrFe12 O19） was prepared from self-made strontium carbonate and tetra-n-butyl titanate by ultrasound technique, when strontium ferrites （SrFe12O19） used as magnetic substrate. Surface properties and magnetic properties of the strontium magnetic photocatalyst were determined by XRD, IR, BET and VSM. The result indicated that the catalyst＇s the grain size was in the range of 20-30nm, and specific surface area was 44：. 8m2/g, the average pore size was 7.09nm. Therefore,the catalyst was a mesoporous magnetic material. Saturation magnetization 12.9A · m2/kg and 120.9kA/ reuse for this catalyst. TiOe-S tio was 94.7%. The efficient times repeat continuallv. The m, respectively. The hi rFei2 O19 catalyzed the d removal ratio of the ph （Ms） and the eoercivity （He） of the catalyst was gh magnetic property was beneficial to separate easily and egradation reaction of methylene blue （MB）, removal raotocatalyst was 88% when the catalyst was employed 3 activity of TiO2-SrFe12 O19 was stable in the process of pollutant degradation.