Chemical oxidation of residual carbon from ZnAl2O4 powders prepared by combustion synthesis |
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| Authors: | Robert Ianoş Radu Lazău Ioan Lazău Cornelia Păcurariu |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China;2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;3. Hunan Province Key Laboratory of Catalysis and Separation of Speciality Petrochemicals, Hunan Institute of Science and Technology, Yueyang 414006, China;1. Department of Physics, Nelson Mandela University, P. O. Box 77000, Port Elizabeth, 6031, South Africa;2. Department of Physics, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba, 9866, South Africa;3. Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa;4. Department of Physics, University of Pretoria, Pretoria, 0002, South Africa;5. Department of Chemistry, University of Johannesburg, P.O. Box: 524, Auckland Park, 2006, South Africa;1. Laboratoire d’études des matériaux (LEM), Université de Jijel, BP. 98, Ouled Aissa, 18000 Jijel, Algeria;2. Laboratory of Interaction Materials and Environment (LIME), University of Mohamed Seddik Ben Yahia, 18000 Jijel, Algeria;3. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry (USTHB), 16111 Algiers, Algeria;4. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Block 11, Acad. G. Bonchev Str., 1113 Sofia, Bulgaria;5. Department of Chemistry, Bilkent University, Main campus, 068000 Ankara, Turkey |
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| Abstract: | The removal of carbon residue from ZnAl2O4 nanopowders by annealing at 500–800 °C leads to a decrease of specific surface area from 228.1 m2/g to 47.6 m2/g. At the same time, the average crystallite size increased from 5.1 nm to 14.9 nm. In order to overcome these drawbacks, a new solution for removing the carbon residue has been suggested: chemical oxidation using hydrogen peroxide. In terms of carbon removal, a H2O2 treatment for 8 h at 107 °C proved to be equivalent to a heat treatment of 1 h at 600 °C. The benefits of chemical oxidation over thermal oxidation were obvious. The specific surface area was much larger (188.1 m2/g) in the case of the powder treated with H2O2. The average crystallite size (5.8 nm) of ZnAl2O4 powder treated with H2O2 was smaller than the crystallite size (8.2 nm) of the ZnAl2O4 powder annealed at 600 °C. |
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