| dc.description.abstract | This thesis is about to synthesize bimetallic metal-organic framework (MOF) materials and carbonized them to apply on catalytic reactions. Carbonization of MOF materials will makes metal nodes in MOF reduce to metallic states, and the organic linkers will also turn into N-doped carbon material to increase the stability of materials. Fex-ZIF67 was synthesized with 2-methylimidazole and precursors of iron and cobalt, and then carbonized into carbon material Fex-CZ67 in a high-temperature calcining furnace.
The first part of experiment is the Fenton degradation reaction of antibiotics-tetracycline and organic dyes. To adjust the content of cobalt and iron to achieve the best degradation effect, it takes 8.5min to degrade tetracycline completely by CZ-67, and the pseudo-first-order reaction rate constant k is 42.78 (min-1gcat-1); while the k values of Fe0.1-CZ67 and Fe0.2-CZ67 drop to 18.98 and 14.92, respectively. But when the iron content rises to 40 % (Fe0.4-CZ67) has the fastest degradation rate, the degradation rate of tetracycline reaches 94.2% in 3.5 minutes, and the reaction rate constant k reaches 79.54. This result is attributed to the synergistic effect of iron and cobalt, while cobalt probably the main catalytic metal, so Fe0.1-CZ67 and Fe0.2-CZ67 have reduced cobalt content and insufficient iron content to provide a synergistic effect in this reaction.
The second part of the experiment is the reduction reaction of hexavalent chromium. The reduction of hexavalent chromium by CZ-67 takes 135 minutes, and the pseudo-first-order reaction rate constant k is 2.16; when the iron content rises to 50 % (Fe0.5-CZ67) has the fastest reduction rate, the reduction rate of hexavalent chromium reached 99.76% in 7.5 minutes, and the reaction rate constant k increased to 79.29. This result is attributed to the synergistic effect of iron and cobalt. | en_US |