| Autor: |
Oliveira, Larissa H., de Barros, Anerise, Pinto, Lidiane O., Oliveira, Cristine S., Kubota, Lauro T., Sigoli, Fernando A., Mazali, Italo O. |
| Předmět: |
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| Zdroj: |
ChemistrySelect; 2/21/2019, Vol. 4 Issue 7, p2160-2167, 8p |
| Abstrakt: |
We report a novel combination of nanomaterial proposed as a peroxidase‐like enzymatic mimic for detection of H2O2, where CeO2 nanoparticles dispersed on SBA‐15 through synthesis by the impregnation‐decomposition cycles method (IDC). The system displays a good peroxidase‐like activity and catalyzes to the oxidation of 3,3',5,5'‐tetramethylbenzidine (TMB) by H2O2. KM values were calculated between 0.04 and 0.08 mM for different (CeO2/SBA‐15)x catalyst system, the results demonstrates that the combination of these materials displayed a good affinity to TMB substrate, consequently improving the colorimetric assay, due to uniform mesostructures of SBA‐15 and their high surface areas. A detailed study of synergistic effects between CeO2NPs and SBA‐15 support were held in order to understand how these effects can improve the colorimetric assay. Additionally, high resolution transmission electron microscopy (HR‐TEM), energy dispersive X‐ray spectroscopy (EDX), Raman spectroscopy, thermogravimetric analysis (TGA), small angle X‐ray scattering (SAXS) and textural properties were utilized for characterization of the prepared catalysts systems. A novel combination nanomaterial based on peroxidase‐like activity, which as CeO2 nanoparticles were impregnated on SBA‐15. Number of sites actives of CeO2 nanoparticles were controlled by impregnation decomposition cycles method and colorimetric assays demonstrate a good affinity of TMB substrate for this catalyst system, exhibiting a good performance for detection of H2O2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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