期刊
CATALYSTS
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/catal11121478
关键词
hydrogen peroxide; chlorates; chlorine dioxide; UV-vis spectrophotometry
资金
- Spanish Agencia Estatal de Investigacion [PID2019-107271RB-I00]
- CNPq- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [202069/2019-2]
Chlorine dioxide was produced by the reduction of chlorate with hydrogen peroxide in strongly acidic media. UV spectra were acquired to monitor the chlorate reduction process. The study found a linear relationship between the amount of limiting reagent consumed and the maximum height of the absorption peak at 360 nm, allowing for calculations of the maximum amount of chlorine dioxide formed. Results showed efficient formation of chlorine dioxide with high reproducibility.
Chlorine dioxide was produced by the reduction of chlorate with hydrogen peroxide in strongly acidic media. To avoid reaction interference during measuring procedures, UV spectra were acquired to monitor the chlorate reduction. This reduction led to the formation of chlorine dioxide and notable concentrations of chlorite and hypochlorous acid/chlorine, suggesting that the hydrogen peroxide:chlorate ratio is important. Once chlorates are transformed to chlorine dioxide, the surplus hydrogen peroxide promoted the further reaction of the chlorinated species down to less-important species. Moreover, chlorine dioxide was stripped with the outlet gas flow. A linear relationship was established between the amount of limiting reagent consumed and the maximum height of the absorption peak at 360 nm after testing with different ratios of hydrogen peroxide and chlorate, allowing calculations of the maximum amount of chlorine dioxide formed. To verify the reproducibility of the method, a test with four replicates was conducted in a hydrogen peroxide/chlorate solution where chlorine dioxide reduction was not promoted due to the presence of surplus chlorate in the reaction medium after the test. Results confirmed the efficient formation of this oxidant, with maximum concentrations of 8.0 +/- 0.33 mmol L-1 in 400-450 min and a conversion percentage of 97.6%. Standard deviations of 0.14-0.49 mmol L-1 were obtained during oxidation (3.6-6.5% of the average), indicating good reproducibility.
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