Abstract
Copper and cobalt aluminates were obtained through the use of chitosan as template. In this synthesis route, chitosan is eliminated by heating, and a porous material is produced. These oxides were used as supports for inulinase immobilization by adsorption process. Physical properties of produced particles were analyzed by X-ray diffraction (XRD) and nitrogen adsorption-desorption isotherms. Both oxides presented particles containing mesoporous characteristics and high surface area, which is desirable for applications in enzyme immobilization processes. The results revealed that the copper and cobalt aluminates exhibit high inulinase immobilization efficiencies, which makes them promising supports for enzyme immobilization.
Highlights
Spinel structure oxides constitute one of the most interesting classes of advanced ceramic materials due their intrinsic physical and chemical properties
Cobalt aluminate samples showed diffraction peaks at 2θ values of 31.19°, 36.74°, 44.69, 55.49°, 59.19° and 65.4° corresponding to the [220], [311], [400], [422], [511] and [440] planes, respectively. These planes are associated with the spinel types CuAl2O4 and CoAl2O4 with cubic structures in agreement with the Joint Committee on Powder Diffraction Standards (JCPDS) cards no. 33-0448 and no. 44-0160, respectively
The results showed that the cobalt aluminate presents more capacity for inulinase adsorption, which could be explained by the surface area value, being higher when compared to the cupper aluminate
Summary
Spinel structure oxides constitute one of the most interesting classes of advanced ceramic materials due their intrinsic physical and chemical properties. Copper (CuAl2O4) and cobalt (CoAl2O4) aluminates possess interesting properties for technological application. Copper aluminate (CuAl2O4) possesses important applications in various fields such as gases sensor[1], catalyst in the oxidation reaction of benzyl alcohol[2,3], methanol steam reforming[4] and hydrogenolysis of glycerol[5], thermoelectric properties[6], photocatalyst for degradating the pollutants in aqueous solution[7,8,9,10], solar absorber[11], oxygen carrier in chemical-looping combustion[12] and optical and dielectric properties[2,13].
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