Tetracycline degradation by persulfate activated with magnetic γ-Fe2O3/CeO2 catalyst: Performance, activation mechanism and degradation pathway

Niu, Lijun; Zhang, Guangming; Xian, Guang; Ren, Zhijun; Wei, Ting; Li, Qiangang; Zhang, Yi; Zou, Zhiguo

doi:10.1016/j.seppur.2020.118156

Cited by 206 publications

(39 citation statements)

References 48 publications

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“…The naproxen degradation efficiency recorded for g-C 3 N 4 , FeCo 2 O 4 , and FeCo 2 O 4 /g-C 3 N 4 was 13, 11, and 21%, respectively. The SI has been calculated using the following relation 3 where R represents the pollutant degradation efficiency. The calculated SI values of each prepared photocatalysts were tabulated.…”

Section: Resultsmentioning

confidence: 99%

“…At higher pH conditions, the •OH radicals, OH – , and SO 5 2– may accumulate on the surface of the catalysts, which reduces the conversion of •SO 4 – from •SO 5 –2 . 3 On the other hand, very high acidic conditions also decrease the naproxen degradation efficiency due to the trapping effect on sulfate and hydroxyl radicals by protons. 5 From Figure 6 b, the naproxen degradation under various PS concentrations can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the research focuses on cobalt-based metal oxides for PS activation toward organic pollutant degradation. 2 , 3 …”

Section: Introductionmentioning

confidence: 99%

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Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts

Palanivel¹,

Hossain

Macadangdang

et al. 2021

ACS Omega

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An effective heterojunction with robust charge separation and enormous degradation efficiency is the major task for photocatalyst preparation. In this study, we have prepared the FeCo 2 O 4 -loaded g-C 3 N 4 nanosheet by the sol–gel-assisted calcination method for photo-Fenton-like degradation under visible-light irradiation by activating persulfate. The nanocomposite exhibits a higher charge separation efficiency than pure g-C 3 N 4 and FeCo 2 O 4 for the degradation reaction against naproxen drugs. An effective interaction between the nanoparticles increases the degradation efficiency up to 91% with a synergistic index of 73.62%. Moreover, the nanocomposite exhibits a 78% mineralization efficiency against the naproxen pollutant under visible-light irradiation. For practical implementation, the degradation reaction was tested with various pH values, different water sources (DI, lake, and tap water), and light sources (LED (visible)/direct sunlight (UV–visible)). Moreover, the possible degradation mechanism predicted by the elemental trapping experiment and the recycling experiment clearly revealed that the heterojunction composite has a high enough degradation stability.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts

Palanivel¹,

Hossain

Macadangdang

et al. 2021

ACS Omega

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“…Further oxidation causes the opening of the C2-C3 double bond and leaves behind a hydroxyl group at the C2 site [34]. The hydroxylation of C1-C3 ketone/enol also occurred in the removal of TC by manganese dioxide modified biochar [34], γ-Fe 2 O 3 /CeO 2 /persulfate [41], 3D polyaniline/perylene diimide via visible light irradiation [42], and superoxide anions [31].…”

Section: Transformation Products and A Possible Pathwaymentioning

confidence: 99%

Transformation of Tetracycline by Manganese Peroxidase from Phanerochaete chrysosporium

et al. 2021

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The negative impacts on the ecosystem of antibiotic residues in the environment have become a global concern. However, little is known about the transformation mechanism of antibiotics by manganese peroxidase (MnP) from microorganisms. This work investigated the transformation characteristics, the antibacterial activity of byproducts, and the degradation mechanism of tetracycline (TC) by purified MnP from Phanerochaete chrysosporium. The results show that nitrogen-limited and high level of Mn2+ medium could obtain favorable MnP activity and inhibit the expression of lignin peroxidase by Phanerochaete chrysosporium. The purified MnP could transform 80% tetracycline in 3 h, and the threshold of reaction activator (H2O2) was about 0.045 mmol L−1. After the 3rd cyclic run, the transformation rate was almost identical at the low initial concentration of TC (77.05–88.47%), while it decreased when the initial concentration was higher (49.36–60.00%). The antimicrobial potency of the TC transformation products by MnP decreased throughout reaction time. We identified seven possible degradation products and then proposed a potential TC transformation pathway, which included demethylation, oxidation of the dimethyl amino, decarbonylation, hydroxylation, and oxidative dehydrogenation. These findings provide a novel comprehension of the role of MnP on the fate of antibiotics in nature and may develop a potential technology for tetracycline removal.

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“…Different techniques have been developed for separation of antibiotics from the environment such as adsorption and catalysis degradation (Jain et al 2020, Niu et al 2021. Adsorption, as one of the most effective separation techniques, has been developed by many scientists, and numerous adsorption substances have been synthesized and modi ed for this purpose (Ahsan et al 2018, Wang et al 2021, Zhao et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Tetracycline Removal Enhancement With Fe-Saturated Nanoporous Montmorillonite in a Tripartite Adsorption/Desorption/Photo-Fenton Degradation Process

Chahardahmasoumi

Jalali

Sarvi

2021

Preprint

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The adsorption and photo-Fenton degradation of tetracycline (TC) over Fe saturated nanoporous montmorillonite was analyzed. The synthesized samples were characterized using XRD, FTIR, SEM, and XRF analysis, and the adsorption and desorption of TC onto these samples as well as the antimicrobial activity of TC during these processes were analyzed at different pH. The results indicated that the montmorillonite is a great adsorbent for the separation of the TC from aqueous solutions, however, after increasing the amount of TC adsorbed, the desorption process started, and up to 50% of TC adsorbed onto non-modified montmorillonite was released back to the solution with almost no changes in its antimicrobial activity. After acid treatment (for creation of nanoporous layers) and Fe saturation of the montmorillonite, almost similar great separation was achieved compared to non-modified montmorillonite. In addition, the desorption of TC from modified montmorillonite was still high up to 40% of adsorbed TC. However, simultaneous adsorption and photodegradation of TC were detected and almost no antimicrobial activity was detected after 180 min of visible light irradiation, which could be due to the photo-Fenton degradation of TC on the modified montmorillonite surface. In the porous structures of modified montmorillonite high ˙OH radicals were created in the photo-Fenton reaction and were measured using the Coumarin technique. The ˙OH radicals help the degradation of TC as proposed in an oxidation process. Surprisingly, more than 90 % of antimicrobial activity of the TC decreased under visible light (after 180 min) when desorbed from nanoporous Fe-saturated montmorillonite compared to natural montmorillonite. To the best of our knowledge, this is the first time that such a high TC desorption rate from an adsorbent with the least remained antimicrobial activity is reported which makes nanoporous Fe-saturated montmorillonite a perfect separation substance of TC from the environment.

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Tetracycline degradation by persulfate activated with magnetic γ-Fe2O3/CeO2 catalyst: Performance, activation mechanism and degradation pathway

Cited by 206 publications

References 48 publications

Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts

Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts

Transformation of Tetracycline by Manganese Peroxidase from Phanerochaete chrysosporium

Tetracycline Removal Enhancement With Fe-Saturated Nanoporous Montmorillonite in a Tripartite Adsorption/Desorption/Photo-Fenton Degradation Process

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Tetracycline degradation by persulfate activated with magnetic γ-Fe2O3/CeO2 catalyst: Performance, activation mechanism and degradation pathway

Cited by 206 publications

References 48 publications

Activation of Persulfate for Improved Naproxen Degradation Using FeCo2O4@g-C3N4 Heterojunction Photocatalysts

Activation of Persulfate for Improved Naproxen Degradation Using FeCo2O4@g-C3N4 Heterojunction Photocatalysts

Transformation of Tetracycline by Manganese Peroxidase from Phanerochaete chrysosporium

Tetracycline Removal Enhancement With Fe-Saturated Nanoporous Montmorillonite in a Tripartite Adsorption/Desorption/Photo-Fenton Degradation Process

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Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts

Activation of Persulfate for Improved Naproxen Degradation Using FeCo₂O₄@g-C₃N₄ Heterojunction Photocatalysts