Stabilization of hemoglobin in double layered hydroxides to be used in carbon monoxide bio-oxidation I-synthesis and characterization

• Hydrotalcites containing hemoglobin were synthesized by microwave irradiation.
• Synthesis methods were by regeneration, simultaneous precipitation or adsorption.
• Iron containing hydrotalcites retains strongly the hemoglobin molecules.
• Hemoglobin interaction with iron hydrotalcites was favored by redox properties.

Carbon monoxide is a very toxic compound and, then, its oxidation to carbon dioxide is of great importance. Many heterogeneous processes have been proposed, but a few consider a mimetic approach. Hemoglobin molecules have high affinity to gases as CO or CO2; therefore, if they are retained they should work as an efficient retainer and catalyst. Being basic they may be anchored in hydrotalcites. The obtained hemoglobin-hydrotalcite hybrid material may, then, promote the capture of CO and, thereafter, oxidate it to CO2.In this work, hydrotalcites containing either aluminum or iron were prepared through three different procedures and tested in hemoglobin retention. In each of those syntheses, hybrids prepared in presence or not of microwave irradiation are compared. The solids were structurally and morphologically different. The sample prepared through the adsorption method presented the strongest interaction between organic and iron inorganic entities. The redox properties of iron explain that strong interaction. Such is not the case in aluminum containing hydrotalcites.

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