pH-dependent oxidation mechanisms over FeCu doped g-C3N4 for ofloxacin degradation via the efficient peroxymonosulfate activation

Tian, Yayang; Li, Qi; Zhang, Ming; Nie, Yulun; Xia, Tian; Yang, Chao; Li, Yong

doi:10.1016/j.jclepro.2021.128207

Cited by 65 publications

(13 citation statements)

References 44 publications

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“…pH can affect the formation of RIs and the structure of pollutants to influence the photodegradation of organic pollutants. Previous studies found that the degradation of OFX by bimetallic doped catalysts exhibited high pH dependence (Tian et al, 2021), while the indirect photodegradation of OFX at different pH in simulated seawater was rarely studied. To explore the influence of pH on the indirect photodegradation of OFX in simulated seawater, we determined the indirect photodegradation rate of OFX from pH 5.0 to 11.0 in the JKHA solution.…”

Section: Effect Of Phmentioning

confidence: 99%

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Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

et al. 2023

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Dissolved organic matter (DOM) plays a non-negligible role in the indirect photodegradation of organic contaminants. This research investigated the roles of DOM and the environmental factors (salinity, pH, NO3−, and HCO3−) in the indirect photodegradation of ofloxacin (OFX) in simulated seawater. Results showed that DOM can significantly accelerate the indirect photodegradation of OFX, and 1O2 and 3DOM* were the main reactive intermediates (RIs) that could promote the indirect photodegradation of OFX. Fluorescence excitation–emission matrix spectroscopy–parallel factor analysis (EEMs-PARAFAC) was used to divide DOM into four fluorescence components. The indirect photodegradation rate of OFX was affected by DOM structure, and terrigenous DOM usually produced more RIs to promote the indirect photodegradation of OFX. Increased salinity significantly promotes the indirect photodegradation of OFX, while increased NO3− concentration had no effect on the OFX indirect photodegradation. pH affected the formation of RIs and the structure of OFX, thereby affecting the indirect photodegradation of OFX. The indirect photodegradation rate of OFX increased in the HCO3− solution, which is due to the formation of carbonate radical (CO3−). This study is essential in understanding the role of DOM in OFX indirect photodegradation and providing a novel insight into the fate, removal, and transformation of OFX.

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Section: Effect Of Phmentioning

confidence: 99%

“…The removal of OFX from aquatic environments has been extensively researched, such as physical, chemical, and biological methods (Tian et al, 2021). Generally, photodegradation is considered the main degradation pathway of OFX in natural water.…”

mentioning

confidence: 99%

Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

et al. 2023

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“…However, this peak was not observed on the other catalysts. The peaks at 1224-1647 and 3175 cm −1 of pure g-C 3 N 4 were attributed to the stretching vibration of the heterocyclic ring (C−N=C) and N−H [50][51][52][53][54][55], respectively. This peak of the heterocyclic ring shifted and became weaker in the CM/g-C 3 N 4 (1083-1176 cm −1 ), possibly because of the influence of Cu, Mg and O elements on the structure of the C−N=C.…”

Section: Ftirmentioning

confidence: 99%

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Wang

Zhang

et al. 2022

Water

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The development of high catalytic performance heterogeneous catalysts such as peroxymonosulfate (PMS) activators is important for the practical remediation of organic pollution caused by Rhodamine B (RhB). An economical and facile synthesized composite of copper–magnesium oxide and carbon nitride (CM/g-C3N4) was prepared by the sol-gel/high-temperature pyrolysis method to activate PMS for RhB degradation. CM/g-C3N4 exhibited a splendid structure for PMS activation, and the aggregation of copper–magnesium oxide was decreased when it was combined with carbon nitride. The introduction of magnesium oxide and carbon nitride increased the specific surface area and pore volume of CM/g-C3N4, providing more reaction sites. The low usage of CM/g-C3N4 (0.3 g/L) and PMS (1.0 mM) could rapidly degrade 99.88% of 10 mg/L RhB, and the RhB removal efficiency maintained 99.30% after five cycles, showing the superior catalytic performance and reusability of CM/g-C3N4. The synergistic effect of copper and g-C3N4 improved the PMS activation. According to the analyses of EPR and quenching experiments, SO4•−, •OH and O2•− radicals and 1O2 were generated in the activation of PMS, of which SO4•− and 1O2 were important for RhB removal. The toxicity of RhB was alleviated after being degraded by the CM/g-C3N4/PMS system. This study provides an efficient and promising strategy for removing dyes in water due to the hybrid reaction pathways in the CM/g-C3N4/PMS system.

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“…For instance, the surface Ti-OOH peroxo species formed between Ti oxoclusters and H 2 O 2 played important roles in the oxidation of DBT and 4,6-DMDBT to the corresponding sulfones. , Given the unstable properties of H 2 O 2 , searching for more stable oxidants to replace H 2 O 2 is necessary. The stable persulfate has a higher redox potential ( E 0 = 2.01 V) than H 2 O 2 ( E 0 = 1.80 V) in aqueous environments and can be decomposed to oxidizing SO 4 •– ( E 0 = 2.5–3.1 V) by various catalysts. − Although persulfate has been extensively applied in the remediation of various contaminants in aqueous environments, − its reactivity in oxidative desulfurization of BT in organic solvents has attracted less attention. Till now, 1-pentyl–3-methylimidazolium chloride/CoCl 2 has been reported to activate persulfate to produce SO 4 •– to oxidize DBT and BT; however, the high persulfate/DBT ratio ( ca .…”

Section: Introductionmentioning

confidence: 99%

Oxidative Desulfurization of Benzothiophene by Persulfate and Cu-Loaded g-C₃ N₄ via the Polymerization Pathway

Zhi

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Turning aromatic sulfur impurities to value-added polymers is a promising technology for fuel desulfurization. In this study, Cu(I,II)@g-C 3 N 4 plates prepared via facile calcination show high reactivity in catalytic oxidation of benzothiophene (BT) by persulfate in a mixture of MeCN/H 2 O (v/v = 50/50). Quenching experiments rule out the primary contributions of SO 4•− , • OH, and O 2•− to BT oxidation and confirm the presence of carbon-centered radicals during the desulfurization process. XPS and Raman analyses reveal that Cu(I) and graphitic-N are reactive sites for persulfate activation, accompanied with moderate activation of the peroxo group in persulfate via the nonradical pathway. Solid characterizations indicate the formation of polybenzothiophene S,S-dioxide during the oxidation process, which further reveals that the moderately activated persulfate abstracts H from BT to form a BT radical cation, followed by subsequent polymerization of BT radical cations to a BT tetramer, and then the BT tetramer is further oxidized to a BT S,S-dioxide tetramer. The high electrochemical stability and pseudo-capacitive properties of the obtained polymers also imply their high potential to be used for capacitors. This work provides new insight on turning aromatic sulfur impurities in fuels to "treasures".

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pH-dependent oxidation mechanisms over FeCu doped g-C3N4 for ofloxacin degradation via the efficient peroxymonosulfate activation

Cited by 65 publications

References 44 publications

Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Oxidative Desulfurization of Benzothiophene by Persulfate and Cu-Loaded g-C₃ N₄ via the Polymerization Pathway

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pH-dependent oxidation mechanisms over FeCu doped g-C3N4 for ofloxacin degradation via the efficient peroxymonosulfate activation

Cited by 65 publications

References 44 publications

Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

Indirect photodegradation of ofloxacin in simulated seawater: Important roles of DOM and environmental factors

Enhanced Degradation of Rhodamine B through Peroxymonosulfate Activated by a Metal Oxide/Carbon Nitride Composite

Oxidative Desulfurization of Benzothiophene by Persulfate and Cu-Loaded g-C3 N4 via the Polymerization Pathway

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Oxidative Desulfurization of Benzothiophene by Persulfate and Cu-Loaded g-C₃ N₄ via the Polymerization Pathway