Comparative investigation of diclofenac degradation by Fe2+/chlorine and Fe2+/PMS processes

Gao, Yu-qiong; Rao, Yan-yan; Han, Ning; Chen, Juxiang; Qian, Zhendong; Tian, Fuyang; Gao, Naiyun

doi:10.1016/j.seppur.2022.121555

Cited by 28 publications

(3 citation statements)

References 54 publications

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“…The acute and chronic toxicity of BPA and its generated intermediates during the degradation process to three selected aquatic organisms (fish, daphnid, and green algae) were predicted by the ecological structure activity relationship (ECOSAR) program. Based on the United Nations Globally Harmonized System, the classification of acute and chronic toxicities can be defined as very toxic, toxic, harmful, and not harmful ( Table S3 ) [ 46 ]. According to Figure 10 and Table S4 , BPA was categorized as “very toxic” to “toxic” (LC 50 /EC 50 /ChV < 10 mg L −1 ) to aquatic organisms in terms of both acute and chronic toxicity, and the intermediates generated during BPA degradation exhibited lower ECOSAR-predicted toxicity (P1–P7), indicating that the ecological threat was decreased after the electrolysis process.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Tang,

Jin,

Zou

et al. 2024

Toxics

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This study presents an electrolysis system utilizing a novel self-circulation process of sulfate (SO42−) and persulfate (S2O82−) ions based on a boron-doped diamond (BDD) anode and an activated carbon fiber (ACF) cathode, which is designed to enable electrochemical remediation of environmental contaminants with reduced use of chemical reagents and minimized residues. The production of S2O82− and hydrogen peroxide (H2O2) on the BDD anode and ACF cathode, respectively, is identified as the source of active radicals for the contaminant degradation. The initiator, sulfate, is identified by comparing the degradation efficiency in NaSO4 and NaNO3 electrolytes. Quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed that the SO4−· and ·OH generated on the ACF cathode are the main reactive radicals. A comparison of the degradation efficiency and the generated S2O82−/H2O2 of the divided/undivided electrolysis system is used to demonstrate the superiority of the synergistic effect between the BDD anode and ACF cathode. This work provides evidence of the effectiveness of the philosophy of “catalysis in lieu of supplementary chemical agents” and sheds light on the mechanism of the generation and transmission of reactive species in the BDD and ACF electrolysis system, thereby offering new perspectives for the design and optimization of electrolysis systems.

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Section: Resultsmentioning

confidence: 99%

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Tang,

Jin,

Zou

et al. 2024

Toxics

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“…6b shows that the ZnCo 2 O 4 /g-C 3 N 4 + PMS system works effectively across a wide initial pH range from 2.95 to 11.04, unlike the traditional homogeneous Fenton reaction, which is signicantly impacted by the pH level of the system. 46 The degradation of NOR accelerates considerably with the increasing initial pH value, and reaches the highest rate at 11.04. The point of zero charge (pH pzc ) of ZnCo 2 O 4 /g-C 3 N 4 was determined to be 5.5 (Fig.…”

Section: Optimization Of Nor Degradation 331 Effect Of Pms Dosagementioning

confidence: 95%

Ultrafine ZnCo₂O₄ QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways

Zeng

Jin

et al. 2023

RSC Adv.

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“…DCF poses a serious threat to the ecological environment and human health and is resistant to biodegradation in the activated sludge process [ 2 , 5 , 6 ]. The advanced oxidation process (AOP) is an important method to remove DCF; however, previous studies have shown that the toxicity of DCF solution experienced an increased stage during some AOP processes and that the toxicity might be related to a generation of chloro derivatives [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Diclofenac by Loaded Solid Superbase-Activated Persulfate

Shi,

Wang,

Gao

et al. 2023

IJMS

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Alkali-activated persulfate (PS) is widely used in situ in chemical oxidation processes; however, studies on the innovation of the alkali activation process are very limited. Two supported solid superbases, namely KNO3/γ-Al2O3 (KAl) and KNO3/SBA-15/MgO (KSM), respectively, were prepared and used to activate persulfate to degrade DCF in this work. The results showed that the superbases elevated the solution pH once added and thus could catalyze persulfate to degrade diclofenac efficiently above pH 10.5. The catalytic efficiency of KAl was close to that of sodium hydroxide, and that of KSM was the highest. The mechanism might be that, in addition to raising the solution pH, some potassium existed as K2O2, which had a strong oxidizing effect and was conducive to DCF removal. Hydroxyl, sulfate and superoxide radicals were all found in the reaction system, among which hydroxyl might play the most important role. The material composition ratio, common anion and humic acid all had some influences on the catalytic efficiency. A total of five intermediates were found in the KSM/PS oxidation system, and six oxidation pathways, which were hydroxylation, dehydrogen, dechlorination, dehydration, decarboxylation, and C-N bond breakage, might be involved in the reaction process. Several highly toxic oxidation products that should be paid attention to were also proposed.

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Comparative investigation of diclofenac degradation by Fe2+/chlorine and Fe2+/PMS processes

Cited by 28 publications

References 54 publications

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Ultrafine ZnCo₂O₄ QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways

Degradation of Diclofenac by Loaded Solid Superbase-Activated Persulfate

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Comparative investigation of diclofenac degradation by Fe2+/chlorine and Fe2+/PMS processes

Cited by 28 publications

References 54 publications

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Sustainable Electrochemical Activation of Self-Generated Persulfate for the Degradation of Endocrine Disruptors: Kinetics, Performances, and Mechanisms

Ultrafine ZnCo2O4 QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways

Degradation of Diclofenac by Loaded Solid Superbase-Activated Persulfate

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Ultrafine ZnCo₂O₄ QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways