Mesoporous Cr 2 O 3 microspheres with improved pore structure were prepared by spray pyrolysis method. A precursor solution was nebulized into fine droplets containing chromium salt and cetyltrimethylammonium bromide (CTAB), which were then pyrolyzed to Cr 2 O 3 /C x microspheres inside a tubular furnace, followed by post-heat treatment to eliminate the carbonaceous material. The produced Cr 2 O 3 particles had a diameter of 0.5-1 um and their textural properties could be tuned by adjusting CTAB amount and pyrolysis temperature. The synthesized Cr 2 O 3 microspheres had the highest surface area and pore volume of 52 m 2 g -1 and 0.3 cm 3 g -1 , respectively, which surpass those of Cr 2 O 3 prepared using a conventional method such as thermal decomposition, hydrothermal reduction or wet chemical synthesis. The photocatalytic degradation of methyl orange dye (MO) was tested on the prepared Cr 2 O 3 particles. It was determined that the spray pyrolysis-derived Cr 2 O 3 exhibited greater photocatalytic activity than that of commercial TiO 2 and Cr 2 O 3 particles prepared by the thermal decomposition of chromium salt.

中文翻译：

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喷雾热解法合成介孔Cr2O3微球及其光催化活性：表面活性剂和热解温度的影响

采用喷雾热解法制备了具有改进孔结构的介孔Cr 2 O 3 微球。将前体溶液雾化成含有铬盐和十六烷基三甲基溴化铵 (CTAB) 的细小液滴，然后在管式炉内热解成 Cr 2 O 3 /C x 微球，然后进行后热处理以消除含碳物质。制备的Cr 2 O 3 颗粒直径为0.5-1 um，可以通过调节CTAB用量和热解温度来调节其结构特性。合成的Cr 2 O 3 微球具有最高的表面积和孔体积，分别为52 m 2 g -1 和0.3 cm 3 g -1 ，超过了采用热分解等常规方法制备的Cr 2 O 3 微球。水热还原或湿化学合成。在制备的Cr 2 O 3 颗粒上测试了甲基橙染料(MO)的光催化降解。确定喷雾热解衍生的 Cr 2 O 3 表现出比商业 TiO 2 和通过铬盐热分解制备的 Cr 2 O 3 颗粒更高的光催化活性。