Alumina supported bimetallic cobalt-iron oxide (Co3O4-Fe2O3/Al2O3) catalyst was prepared via co-impregnation of boehmite with the mixture solution of cobalt nitrate and iron nitrate followed by calcination in air. X-ray photoelectron spectroscopy and high-resolution transmission electron microscope analyses confirmed the existence of highly dispersed Co3O4 and Fe2O3 nanoparticles in the as-prepared catalysts. The catalytic activity of Co3O4-Fe2O3/Al2O3 was evaluated for the degradation of H-acid in aqueous solution by heterogeneous activation of peroxymonosulfate. The results indicated that the Co3O4-Fe2O3/Al2O3 catalyst exhibited an identical initial activity but much better recyclability than Co3O4/Al2O3 due to its low amount of metal leaching and possible redox circle of Co(II)/Co(III). Electron paramagnetic resonance spectroscopy and radical quenching experiments suggested that singlet oxygen (1O2) contributed much more than ·OH and SO4• to H-acid degradation, and the degradation mainly followed a nonradical reaction mechanism.

中文翻译：

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Co3O4-Fe2O3/Al2O3过硫酸盐活化降解H酸的动力学和机理研究

通过将勃姆石与硝酸钴和硝酸铁的混合溶液共浸渍，然后在空气中煅烧，制备氧化铝负载的双金属钴-铁氧化物（Co3O4-Fe2O3/Al2O3）催化剂。X 射线光电子能谱和高分辨率透射电子显微镜分析证实了所制备的催化剂中存在高度分散的 Co3O4 和 Fe2O3 纳米颗粒。Co3O4-Fe2O3/Al2O3 的催化活性通过过氧单硫酸盐的多相活化对水溶液中 H-酸的降解进行了评估。结果表明，Co3O4-Fe2O3/Al2O3 催化剂表现出相同的初始活性，但由于其低金属浸出量和 Co(II)/Co(III) 可能的氧化还原循环，比 Co3O4/Al2O3 具有更好的可回收性。