Title: Synthesis of Fe, Co, Ni loaded MCM-41 mesoporous molecular sieves and their catalytic oxidation performance
Abstract: In this study, direct synthesis and post-treatment methods were developed to prepare a series of heterogeneous catalysts using mesoporous molecular sieves MCM-41 as carrier to load different transition metals (Fe, Co, Ni). Besides, Al was used to improve the structure of MCM-41 and a series of Al/Fe-MCM-41 catalysts were also prepared. The composition, surface morphology and crystalline phase of the catalysts were characterized. Decolorization of an anthraquinone dye, Reactive Brilliant Blue KN-R, by hydrogen peroxide was investigated to evaluate the catalytic activity of these heterogeneous catalysts. The impacts of preparation methods, types and loading amounts of transition metals on decolorization and the stability of the catalysts were investigated. The results showed that the catalysts obtained by direct synthesis had greater catalytic activity and less loss of metals. The Fe(Ⅱ) loaded catalysts had much higher catalytic activity compared to Co(Ⅱ) and Ni(Ⅱ) in dye decolorization. Furthermore, the catalytic activity increased markedly with the loading amount of the transition metals. Under the conditions of 4.0 g·L-1 catalyst, 50.0 mmol·L-1 H2O2, and initial pH 2.5, over 95% of 250 mg·L-1 KN-R were decolorized within 30 min by Fe-MCM-41, and the removal of TOC was greater than 60%. The modification by Al further improved the catalytic activity, and 250 mg·L-1 were completely decolorized within 10 min by Fe/Al composite loaded catalyst when Al/Si ratio was 0.21 and the loading amount of Fe was 23.6 mg·g-1. After 3 times of running, the catalysts maintained good dye decolorization performance, but the catalytic activity decreased in further use.
Publication Year: 2016
Publication Date: 2016-06-15
Language: en
Type: article
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Cited By Count: 1
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