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231225s2022 xx |||||o 00| ||eng c |
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|a 10.1080/09593330.2020.1776402
|2 doi
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|a pubmed24n1034.xml
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|a (DE-627)NLM310472679
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|a (NLM)32466719
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Nicodemos Ramos, Márcio Daniel
|e verfasserin
|4 aut
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1 |
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|a Effect of cysteine using Fenton processes on decolorizing different dyes
|b a kinetic study
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|c 2022
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 20.01.2022
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|a Date Revised 20.01.2022
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Amino acid cysteine has been used as reducing mediator with the aim of improving dye degradation by homogeneous Fenton processes (Fe2+/H2O2 and Fe3+/H2O2). Through its known Fe3+-reducing activity, this amino acid can enhance the production of reactive oxygen species as HO• (hydroxyl radical) and its pro-oxidant properties have been verified while decolorizing diverse dyes in the present work. Its presence enhanced decolorization of Methyl Orange, Phenol Red, Safranin T, Rhodamine B, Reactive Black 5 and Reactive Yellow 2, mainly in reactions initially containing Fe3+ as a catalyst (Fe3+-reactions). E.g. Fe3+/H2O2 and Fe3+/H2O2/cysteine systems decolorized 27% and 44% of Phenol Red after 60 min, respectively. A kinetic modeling analysis has revealed that 1st-order and mainly 2nd-order kinetic models were well fitted to both Fe2+- and Fe3+-reactions data. Improvements in reaction rate constants have been observed by adding cysteine. In experiments performed at varied temperatures, it was found a decrease in activation energy (Ea) due to cysteine addition while decolorizing Safranin T: Ea decreased from 104.6 to 88.9 kJ mol-1 for Fe3+-reactions and from 81.0 to 52.2 kJ mol-1 for Fe2+-reactions. Therefore, it was found that cysteine decreases the energy barrier so as to improve Fenton-based decolorization reactions
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|a Journal Article
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|a Fenton reaction
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|a cysteine
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|a dye
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|a hydroxyl radical
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|a kinetic
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|a Coloring Agents
|2 NLM
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|a Hydrogen Peroxide
|2 NLM
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|a BBX060AN9V
|2 NLM
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|a Iron
|2 NLM
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|a E1UOL152H7
|2 NLM
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| 650 |
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|a Cysteine
|2 NLM
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| 650 |
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|a K848JZ4886
|2 NLM
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| 700 |
1 |
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|a Sousa, Larissa Aquino
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Aguiar, André
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Environmental technology
|d 1993
|g 43(2022), 1 vom: 06. Jan., Seite 70-82
|w (DE-627)NLM098202545
|x 1479-487X
|7 nnns
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| 773 |
1 |
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|g volume:43
|g year:2022
|g number:1
|g day:06
|g month:01
|g pages:70-82
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|u http://dx.doi.org/10.1080/09593330.2020.1776402
|3 Volltext
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|h 70-82
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