Advanced oxidation process based on water radiolysis to degrade and mineralize diclofenac in aqueous solutions

Alkhuraiji, Turki S.

doi:10.1016/j.scitotenv.2019.06.164

Cited by 25 publications

(7 citation statements)

References 46 publications

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“…Radiolytic degradation of ligands is always a concern for practical applications. Ligands with tert -butyl groups attached to aromatic frameworks (as opposed to methyl analogs) tend to show increased radiolytic stability, as methyl-substituted aromatic extractants are particularly susceptible to H atom elimination because of facile homolytic elimination of hydrogen in benzyl positions. , …”

Section: Resultsmentioning

confidence: 99%

“…Ligands with tert-butyl groups attached to aromatic frameworks (as opposed to methyl analogs) tend to show increased radiolytic stability, as methylsubstituted aromatic extractants are particularly susceptible to H atom elimination because of facile homolytic elimination of hydrogen in benzyl positions. 34,35 UV−Vis Titration Experiments. UV−vis titrations of dsa ligands with Sm(NO 3 ) 3 •6H 2 O in CH 3 CN in the presence of NaOH provided evidence of complex formation with a decrease in absorbance at 258 nm and a clear isosbestic point at 247 nm, while a second isosbestic point is obstructed by the increase in the Sm(NO 3 ) 3 absorption (Figure 2).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Spectroscopic and Theoretical Insights into Surprisingly Effective Sm(III) Extraction from Alkaline Aqueous Media by o-Phenylenediamine-Derived Sulfonamides

et al. 2020

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Alkaline high-level waste (HLW) generated as a result of years of nuclear weapons production has complicated composition and requires comprehensive treatment methods, which would allow concentrating its most radiotoxic components in a small volume for geological disposal. We have investigated six alkyl-substituted o-phenylenediamine-derived sulfonamides for extraction and consecutive stripping of Sm(III) from alkaline aqueous media. Up to 81% of Sm(III) recovery at pH 13.0–13.5 was achieved by disulfonamide (dsa) or dsa/Et3N in CH2Cl2, measured after contact with organic phases and subsequent stripping with 0.1 M HNO3. The use of Et3N dramatically enhances Sm(III) extraction at lower pH ranges (10.5–11.5) but decreases extraction at pH 13.0–13.5, while control experiments with Et3N and no dsa showed no extraction. Analysis of the extraction equilibria gave a 1:1 sulfonamide–Sm(III) complexation ratio, with the extracted species also presumed to contain coordinated H2O or OH–, as also shown by DFT calculations. Titration experiments of sulfonamides with Sm(III) in CH3CN were consistent with a 1:1 complexation ratio of dsa-6 to Sm(III) with a K 11 = 6.6 × 107 M–1 derived from nonlinear regression analysis of the 1:1 binding isotherm. Theoretical DFT calculations determined the structures of possible species formed during extraction and the thermodynamics of extraction processes based on several initial [Sm(OH) y (NO3) z (H2O) x ]3–y−z species and 1:1 Sm(III)/dsa-3 2– complexes formed in the organic phase, in which dsa complexes to Sm(III) in its bis-deprotonated form (denoted below as dsa-3 2– ). Organization of close ion pairs of type {Na[Sm(dsa-3 2– )(OH)2]·2H2O} was shown to be thermodynamically favorable for extraction from alkaline aqueous media with pH = 13.0–13.5. Theoretical calculations also demonstrated thermodynamically favorable coordination to Am(III).

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Spectroscopic and Theoretical Insights into Surprisingly Effective Sm(III) Extraction from Alkaline Aqueous Media by o-Phenylenediamine-Derived Sulfonamides

et al. 2020

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“…It has been shown that both the hydroxyl radical • OH and the hydrated electron e aq − participate in the reaction of DCF decomposition and reduction in toxicity. It has been shown that in the γ/N 2 O system, the dose needed to decompose 480 µM was reduced from 7.4 to 1.47 kGy as compared to free O 2 [98]. It was also noted that the addition of H 2 O 2 , S 2 O 8 2− , or the saturation of the solution before irradiation with N 2 O significantly increases the degree of mineralization.…”

Section: Non-steroidal Anti-inflammatory Drug Degradationmentioning

confidence: 99%

Application of Radiation Technology in Removing Endocrine Micropollutants from Waters and Wastewaters—A Review

Bojanowska-Czajka

2021

Applied Sciences

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Advanced Oxidation Processes (AOPs) are increasingly being adopted as a post-treatment after conventional wastewater treatment, mainly due to the efficient removal of biodegradable organic micropollutants. Endocrine disruptors are a specific group of such micropollutants. Many scientific studies demonstrate their extremely harmful effects on living organisms, even at low concentrations in water and wastewater. AOPs based on the generation of reactive species using radiation technologies, these being gamma radiation and electron beam, are still not being used to their full potential. This publication presents the application possibilities of using ionizing radiation for the degradation of selected endocrine micropollutants in water and wastewater.

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“…The application of TiO 2 as an effective treatment has also been reported to remove pharmaceutical contaminants from water with high efficiency. Due to their high photolysis sensitivity in aquatic systems, they have been used, for instance, to treat diclofenac [74,75], and triclosan [76].…”

Section: Photocatalytic Point Of Viewmentioning

confidence: 99%

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

et al. 2020

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Biomedical waste management is getting significant consideration among treatment technologies, since insufficient management can cause danger to medicinal service specialists, patients, and their environmental conditions. The improvement of waste administration protocols, plans, and policies are surveyed, despite setting up training programs on legitimate waste administration for all healthcare service staff. Most biomedical waste substances do not degrade in the environment, and may also not be thoroughly removed through treatment processes. Therefore, the long-lasting persistence of biomedical waste can effectively have adverse impact on wildlife and human beings, as well. Hence, photocatalysis is gaining increasing attention for eradication of pollutants and for improving the safety and clearness of the environment due to its great potential as a green and eco-friendly process. In this regard, nanostructured photocatalysts, in contrast to their regular counterparts, exhibit significant attributes such as non-toxicity, low cost and higher absorption efficiency in a wider range of the solar spectrum, making them the best candidate to employ for photodegradation. Due to these unique properties of nanophotocatalysts for biomedical waste management, we aim to critically evaluate various aspects of these materials in the present review and highlight their importance in healthcare service settings.

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Advanced oxidation process based on water radiolysis to degrade and mineralize diclofenac in aqueous solutions

Cited by 25 publications

References 46 publications

Spectroscopic and Theoretical Insights into Surprisingly Effective Sm(III) Extraction from Alkaline Aqueous Media by o-Phenylenediamine-Derived Sulfonamides

Spectroscopic and Theoretical Insights into Surprisingly Effective Sm(III) Extraction from Alkaline Aqueous Media by o-Phenylenediamine-Derived Sulfonamides

Application of Radiation Technology in Removing Endocrine Micropollutants from Waters and Wastewaters—A Review

Biomedical Waste Management by Using Nanophotocatalysts: The Need for New Options

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