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采用简单的固相合成法得到Sr Ti O3纳米粉,合成样品的结构、组成和光学性质通过XRD、Raman、TEM和UV-Vis等进行分析测试。以30 W Hg灯为光源,K2Cr2O7水溶液、甲基橙水溶液,以及甲基橙和K2Cr2O7的混合水溶液为模型污染物,考察合成样品的光催化性能。结果表明:所得样品是由55~86 nm的颗粒状物质组成的带隙值为3.02 e V的立方相Sr Ti O3;光照180 min时Sr Ti O3对MO和K2Cr2O7混合水溶液的光催化效率均高于相应的单一溶液;在处理含Cr(VI)水溶液过程中,所制Sr Ti O3表现出比P25 Ti O2更高的催化活性;进一步阐述了光催化反应机理。
The SrTiO3 nanopowders were obtained by a simple solid-phase synthesis method. The structure, composition and optical properties of the synthesized samples were analyzed by XRD, Raman, TEM and UV-Vis. A 30 W Hg lamp was used as a light source, K2Cr2O7 aqueous solution, methyl orange aqueous solution and mixed aqueous solution of methyl orange and K2Cr2O7 as model pollutants to investigate the photocatalytic performance of the synthesized samples. The results show that SrTiO3 is a cubic phase SrTiO3 with a band gap value of 3.02 eV, which is composed of granular material of 55 ~ 86 nm. The photocatalytic efficiency of SrTiO3 mixed aqueous solution of MO and K2Cr2O7 In the solution of Cr (VI), the prepared SrTiO3 showed higher catalytic activity than that of P25TiO2. The photocatalytic reaction mechanism was further elaborated.