Effect of Co60 irradiation on the degradation and mineralization of sulfonated aromatic compounds in aqueous solutions

Alkhuraiji, Turki S.

doi:10.1016/j.chemosphere.2019.04.087

Cited by 6 publications

(4 citation statements)

References 49 publications

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“…Based on the reported literature , and the results of the present work, the degradation mechanism of MB in the EBI&CN/CD 3 /Fe 6 system was proposed. Figure a presents three routes: (I) The radiolysis of water generates oxidants and reductants, such as • OH, e aq – , • H, and H 2 O 2 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Mechanism of MB Degradation in the EBI&CN/ CD 3 /Fe 6 System. Based on the reported literature 50,51 and the results of the present work, the degradation mechanism of MB in the EBI&CN/CD 3 /Fe 6 system was proposed. Figure 11a presents three routes: (I) The radiolysis of water generates oxidants and reductants, such as Regardless of the pathways (water radiolysis (I), solution reactions (II), or surface reactions (III)), the MB molecules could be degraded by these reactive species.…”

Section: Effect Of Solution Ph On the Process Of Organic Dyes Degrada...mentioning

confidence: 90%

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Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tao

et al. 2022

ACS Omega

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Organic dyes are ubiquitous pollutants in various aquatic environments as they are produced in abundance and used widely. In the present work, the degradation and mineralization of various organic dyes such as methylene blue (MB), methyl orange (MO), and rhodamine B (RhB), following the electron beam irradiation method in the presence of a graphitic carbon nitride/carbon nanodots/Fe(II) (CN/CD 3 /Fe 6 ) composite, were studied. The removal efficiency of MB reached 81.7% under conditions of electron beam irradiation (EBI) when the total irradiation dose was 5 kGy. This increased to 91.2% in the presence of the CN/CD 3 /Fe 6 composite. The mineralization efficiency increased from 30.1 to 47.3% when the composite was added, and the total irradiation dose was 20 kGy. The removal efficiency of organic dyes was not significantly affected in the pH range of 3–11. Results from cyclic experiments conducted using MB degradation indicated that the CN/CD 3 /Fe 6 composite exhibited good stability and reusability even after five irradiation cycles. Results from scavenging experiments revealed that • OH was the predominant reactive species during the MB degradation process. Intermediates produced in the synergistic system (EBI&CN/CD 3 /Fe 6 system) consisting of the CN/CD 3 /Fe 6 composite and EBI were detected using the liquid chromatography-mass spectrometry (LC-MS) technique. Based on the results, the possible degradation mechanism and pathways for MB were proposed.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Effect Of Solution Ph On the Process Of Organic Dyes Degrada...mentioning

confidence: 90%

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Tao

et al. 2022

ACS Omega

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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%

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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“…[3] The aromatic groups and sulfonate groups in PSA significantly improve its water solubility, chemical stability and toxicity, resulting in difficult removal by self-degradation and microbial elimination. [4] Photodegradation technology is developed to eliminate persistent organic pollutants because of its cheap removal procedure and mild operation conditions. [5,6] Although most of heavy metal ions in electroplating wastewater are eliminated by ion exchange, coprecipitation and adsorption, [7][8][9] the residual ions with low concentrations may still affect the photocatalytic activity of photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Heavy Metal Ions in Wastewater Affect the Photodegradation of Phenol‐4‐sulfonic Acid over Biphasic TiO₂/Activated Carbon Fiber Composites

Cheng

Guo

et al. 2021

ChemistrySelect

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The effect mechanism of Cu 2 + , Zn 2 + and Ni 2 + ions in wastewater on photocatalytic activity remained unknown. For phenol-4-sulfonic acid (PSA) photodegradation, we fabricated anatase/rutile/activated carbon fiber composites (A/R/ACFs) by the hydrothermal deposition of rutile TiO 2 nanorods and anatase TiO 2 nanoparticles on ACFs. A/R/ACFs exhibited better photocatalytic activity than both R/ACFs and A/ACFs because anatase/rutile heterojunctions supported electron transfer from rutile to anatase. All Cu 2 + , Zn 2 + and Ni 2 + ions in wastewater improved the chemical stability of PSA by forming PSA-Cu(II), PSA-Zn(II) and PSA-Ni(II) complex compounds, and thus inhibited the PSA photodegradation. Notably, the as-formed photoelectrons over A/R/ACFs were partly consumed due to the reduce reaction of Cu 2 + ions into Cu + /Cu 0 , avoiding electron-hole recombination and improving PSA photodegradation efficiency. No reduce reaction of Zn 2 + and Ni 2 + ions occurred during the PSA photodegradation process. Hence, the A/R/ACFs are an effective photocatalyst for wastewater purification, and low Cu 2 + concentrations facilitated the PSA photodegradation.

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Effect of Co60 irradiation on the degradation and mineralization of sulfonated aromatic compounds in aqueous solutions

Cited by 6 publications

References 49 publications

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

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

Heavy Metal Ions in Wastewater Affect the Photodegradation of Phenol‐4‐sulfonic Acid over Biphasic TiO₂/Activated Carbon Fiber Composites

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Effect of Co60 irradiation on the degradation and mineralization of sulfonated aromatic compounds in aqueous solutions

Cited by 6 publications

References 49 publications

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

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

Heavy Metal Ions in Wastewater Affect the Photodegradation of Phenol‐4‐sulfonic Acid over Biphasic TiO2/Activated Carbon Fiber Composites

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Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD₃/Fe₆ Composite: Mechanistic Studies

Heavy Metal Ions in Wastewater Affect the Photodegradation of Phenol‐4‐sulfonic Acid over Biphasic TiO₂/Activated Carbon Fiber Composites