Effects of Calcination Temperature and Photocatalytic Activity of 30%SrTiO3/HZSM-5 Synthesized by Sol-gel Route

A 30%SrTiO3/HZSM-5 photocatalyst was synthesized by solgel method using HZSM-5 as the support for strontium titanate. The materials are mainly composed of perovskite SrTiO3 that is favored at high calcination temperature. The diffraction intensities of SrTiO3 increase with raising calcination temperature while the diffraction intensity of SrCO3 decreases at the same time. Crystal growing of the supported SrTiO3 occurs along with the increase of calcination temperature. SrTiO3 disperses on the surface of HZSM-5 after loading. Surface area of 30%SrTiO3/HZSM-5 is much larger than that of unsupported SrTiO3. The maximum photocatalytic degradation efficiency is found in the composite calcinated at 700 °C. After 90 min of irradiation, 93.8% of the initial RBR-X3B is degraded on 30%SrTiO3/0.3HZSM-5. Nearly 80% of the initial activity of the supported SrTiO3 is maintained after 4 photocatalytic recycles.