A kinetic study of electrochemical decolorization of arylazo pyridone dyes
Конференцијски прилог (Објављена верзија)
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Electrocatalytic decolorization of arylazo pyridone dyes (Fig. 1) was investigated in the presence of NaCl using DSA Ti/PtOx electrode in diluted NaOH. Decolorization can be attributed to the indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. Decolorization has been investigated for different sodium chloride concentration ni hte range from 10 gdm" to 40 gdm', agitation speed ni the range from 150 to 500 rpm, currents ni the range of 100 to 250 mA, and dye concentration from 5 to 20 mg dm. There is a significant effect of agitation speed on the decolorization rate between 150 and 325 rpm with a negligible effect after 325 rpm. The rate constant increases with increasing salt concentration up to 03 gdm". At higher concentration, namely at 40 gdma smal decrease ni the reaction rate was observed. Increase in dye concentration decrease the reaction rate, while above the concentration of 10 mg dm there si a smal, almost n...egligible decrease ni the electrocatalytic rate of decolorization. Above 200 mA the rate constant deviate from the linearity probably due to the direct oxidation of the dye on the electrode surface. Optimum electrolyte should contain ~30 g dm NaCl, and electrolysis parameters will be
as follows: current 200 mA (400 mA dm) with the reaction voltage of 3.35 V. The effect of substituents on the reaction rate was also studied. It was concluded that the electron- accepting substituents inhibit the reaction, while electron-donating substituents promote the reaction.
Извор:
Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013, 2013, 124-Издавач:
- Belgrade : Serbian Chemical Society
Финансирање / пројекти:
- Проучавање синтезе, структуре и активности органских једињења природног и синтетског порекла (RS-MESTD-Basic Research (BR or ON)-172013)
Институција/група
Tehnološko-metalurški fakultetTY - CONF AU - Mirković, Jelena AU - Prlainović, Nevena AU - Ušćumlić, Gordana AU - Grgur, Branimir AU - Mijin, Dušan PY - 2013 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7306 AB - Electrocatalytic decolorization of arylazo pyridone dyes (Fig. 1) was investigated in the presence of NaCl using DSA Ti/PtOx electrode in diluted NaOH. Decolorization can be attributed to the indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. Decolorization has been investigated for different sodium chloride concentration ni hte range from 10 gdm" to 40 gdm', agitation speed ni the range from 150 to 500 rpm, currents ni the range of 100 to 250 mA, and dye concentration from 5 to 20 mg dm. There is a significant effect of agitation speed on the decolorization rate between 150 and 325 rpm with a negligible effect after 325 rpm. The rate constant increases with increasing salt concentration up to 03 gdm". At higher concentration, namely at 40 gdma smal decrease ni the reaction rate was observed. Increase in dye concentration decrease the reaction rate, while above the concentration of 10 mg dm there si a smal, almost negligible decrease ni the electrocatalytic rate of decolorization. Above 200 mA the rate constant deviate from the linearity probably due to the direct oxidation of the dye on the electrode surface. Optimum electrolyte should contain ~30 g dm NaCl, and electrolysis parameters will be as follows: current 200 mA (400 mA dm) with the reaction voltage of 3.35 V. The effect of substituents on the reaction rate was also studied. It was concluded that the electron- accepting substituents inhibit the reaction, while electron-donating substituents promote the reaction. PB - Belgrade : Serbian Chemical Society C3 - Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013 T1 - A kinetic study of electrochemical decolorization of arylazo pyridone dyes SP - 124 UR - https://hdl.handle.net/21.15107/rcub_technorep_7306 ER -
@conference{ author = "Mirković, Jelena and Prlainović, Nevena and Ušćumlić, Gordana and Grgur, Branimir and Mijin, Dušan", year = "2013", abstract = "Electrocatalytic decolorization of arylazo pyridone dyes (Fig. 1) was investigated in the presence of NaCl using DSA Ti/PtOx electrode in diluted NaOH. Decolorization can be attributed to the indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. Decolorization has been investigated for different sodium chloride concentration ni hte range from 10 gdm" to 40 gdm', agitation speed ni the range from 150 to 500 rpm, currents ni the range of 100 to 250 mA, and dye concentration from 5 to 20 mg dm. There is a significant effect of agitation speed on the decolorization rate between 150 and 325 rpm with a negligible effect after 325 rpm. The rate constant increases with increasing salt concentration up to 03 gdm". At higher concentration, namely at 40 gdma smal decrease ni the reaction rate was observed. Increase in dye concentration decrease the reaction rate, while above the concentration of 10 mg dm there si a smal, almost negligible decrease ni the electrocatalytic rate of decolorization. Above 200 mA the rate constant deviate from the linearity probably due to the direct oxidation of the dye on the electrode surface. Optimum electrolyte should contain ~30 g dm NaCl, and electrolysis parameters will be as follows: current 200 mA (400 mA dm) with the reaction voltage of 3.35 V. The effect of substituents on the reaction rate was also studied. It was concluded that the electron- accepting substituents inhibit the reaction, while electron-donating substituents promote the reaction.", publisher = "Belgrade : Serbian Chemical Society", journal = "Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013", title = "A kinetic study of electrochemical decolorization of arylazo pyridone dyes", pages = "124", url = "https://hdl.handle.net/21.15107/rcub_technorep_7306" }
Mirković, J., Prlainović, N., Ušćumlić, G., Grgur, B.,& Mijin, D.. (2013). A kinetic study of electrochemical decolorization of arylazo pyridone dyes. in Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013 Belgrade : Serbian Chemical Society., 124. https://hdl.handle.net/21.15107/rcub_technorep_7306
Mirković J, Prlainović N, Ušćumlić G, Grgur B, Mijin D. A kinetic study of electrochemical decolorization of arylazo pyridone dyes. in Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013. 2013;:124. https://hdl.handle.net/21.15107/rcub_technorep_7306 .
Mirković, Jelena, Prlainović, Nevena, Ušćumlić, Gordana, Grgur, Branimir, Mijin, Dušan, "A kinetic study of electrochemical decolorization of arylazo pyridone dyes" in Book of abstracts / 8th International Conference of the Chemical Societies of the South-East European Countries - ICOSECS 8, Belgrade, Serbia, June 27-29, 2013 (2013):124, https://hdl.handle.net/21.15107/rcub_technorep_7306 .