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Degradation and toxicity depletion of RB19 anthraquinone dye in water by ozone-based technologies
Abstract
This research investigated the discoloration and mineralization of Reactive Blue 19 (RB19) anthraquinone dye by single ozonation, single UV radiation and ozonation jointed with UV radiation (O3/UV). The problem was approached from two points of view: with the objective of color removal or the mineralization of solution. In each case, the optimum operating conditions were different. Ozonation was the most effective treatment for color removal, while the combined O3/UV treatment was for mineralization. Major intermediates of the dye degradation were identified by gas chromatography/mass spectrometry and a degradation pathway was proposed. In addition, a clear decrease of the toxicity of the dye was achieved at the end of the experiments. The effect of initial dye concentration, pH, ozone dose, and UV radiation on the degradation of the dye and decrease of total organic carbon was investigated, in order to establish the optimal operating conditions to achieve discoloration, mineralization or a combination of both.
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Studies on Reactive Blue 19 using same starting concentration (100 mg/mL) but different combination of AOP showed highly different results.
“Studies on Reactive Blue 19 conducted by different groups, using the same starting concentration (100 mg/mL) but different combination of AOP, showed highly different results.”
From Degradation of anthraquinone dyes from effluents: A review focusing on enzymatic dye degradation with industrial potential (2020) · cites this paper as [68]
The introduction reports large discrepancies among RB19 studies by different groups, and the section on UV radiation reports different outcomes for UV, ozone, and UV/ozone treatments. But the paper does not establish that those groups used the same starting concentration of 100 mg/mL; its own treatment comparison used approximately 230 mg/L. (LLM, conf=0.88)
Experimental — accuracy not yet measuredUsing combination of methods such as Fenton reaction coupled with adsorption on pyrite ash, or ozonation coupled with UV radiation can be much more efficient compared to ozonation only.
“It was shown that using a combination of methods such as Fenton reaction coupled with adsorption on pyrite ash 67 , or ozonation coupled with UV radiation 68 can be much more efficient compared to ozonation only 69 , based on the .”
From Degradation of anthraquinone dyes from effluents: A review focusing on enzymatic dye degradation with industrial potential (2020) · cites this paper as [68]
Identified fragments for ozonation of Reactive Blue 19 ranged from a mixture of phenol, acetic acid and propandioic acid, to a mixture of phenol, acetic acid and oxalic acid, and to a mixture of phthalic acid and unspecified carboxylic acids.
“Identified fragments ranged from a mixture of phenol, acetic acid and propandioic acid 68 , to a mixture of phenol, acetic acid and oxalic acid 92 and to a mixture of phthalic acid and unspecified carboxylic acids 69 .”
From Degradation of anthraquinone dyes from effluents: A review focusing on enzymatic dye degradation with industrial potential (2020) · cites this paper as [68]
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Research works printed but not linked: 26
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Cited by
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Routoula, E., & Patwardhan, S. V. (2020) · Environmental Science & Technology · doi:10.1021/acs.est.9b03737 · Cited by 579
Metadata
- Authors
- Lovato, M. E., Fiasconaro, M. L., & Martín, C. A.
- Venue
- Water Science and Technology
- Publisher
- IWA Publishing
- Published
- 2016-12-05
- Volume
- 75
- Issue
- 4
- Pages
- 813-822
- ISSN
- 0273-1223
- 1996-9732
- Cited by
- 29
- References
- 0
- Language
- en
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