Synergistic degradation of PNP via coupling H2O2 with persulfate catalyzed by nano zero valent iron

Du, Jiangkun; Wang, Yang; Faheem, Faheem; Xu, Tiantian; Zheng, Han; Bao, Jianguo

doi:10.1039/c9ra02901j

Cited by 22 publications

(4 citation statements)

References 36 publications

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“…The reduction effect of nano-zero-valent iron reduces nitrobenzene to aniline, and SO4 -• oxidizes aniline through electron transfer. Du et al [66] studied the mechanism of simultaneous activation of hydrogen peroxide and persulfate by nZVI to degrade p-nitrophenol (PNP). •OH and SO4 -• jointly degrade p-nitrophenol.…”

Section: Electronic Transfermentioning

confidence: 99%

Enhanced Mechanism of Nano Zero-Valent Iron Activated Persulfate for Persistent Organic Pollutants in the Environment

Iribagiza

Liang

et al. 2022

Glob. Environ. Eng.

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The advanced oxidation process based on persulfate has a broad application prospect in the remediation of organic pollutants. As an effective, low-cost and environmentally friendly material, nano-zero-valent iron (nZVI) can effectively activate persulfate (nZVI/PS) to generate strongly oxidizing sulfate radical for removing organic pollutants in the environment. In this review, we first clarify the activation pathway of nZVI activated persulfate including direct activation and indirect activation. Direct activation means that the electrons released by nZVI directly participate in the activation of PS; indirect activation means that Fe0 corrodes to generate Fe2+, and Fe2+ further activate the persulfate. Then, the mechanism of nZVI/PS system to degrade organic pollutants including electron transfer, hydrogen extraction and addition reactions are also discussed. Finally, combined with the activation pathway and the mechanism of degrading organic pollutants, we propose several prospects for the future research direction of nZVI activated persulfate. As a result, this review provides a theoretical basis for the nZVI/PS advanced oxidation system to remediate actual sites contaminated with organic pollutants.

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Section: Electronic Transfermentioning

confidence: 99%

Enhanced Mechanism of Nano Zero-Valent Iron Activated Persulfate for Persistent Organic Pollutants in the Environment

Iribagiza

Liang

et al. 2022

Glob. Environ. Eng.

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“…The simultaneous activation of H 2 O 2 and PDS by nZVI displays the potential to alleviate the drawbacks as they are used alone. , The coupling use of H 2 O 2 and PDS was found to mitigate nZVI passivation and boost the degradation of organic pollutants, and the favorable effect was attributed to the release of protons from PDS hydrolysis providing acidic conditions to promote H 2 O 2 activation. , However, in comparison to the PDS alone system, the enhancement by using the binary oxidants is mild. Moreover, the unclear consumption and contribution of each oxidant and the inherent nZVI surface chemistry in the binary-oxidant system restrict further improvement by utilizing the synergistic effect of the two oxidants.…”

Section: Introductionmentioning

confidence: 99%

“…The simultaneous activation of H 2 O 2 and PDS by nZVI displays the potential to alleviate the drawbacks as they are used alone. 19,20 The coupling use of H 2 O 2 and PDS was found to mitigate nZVI passivation and boost the degradation of organic pollutants, and the favorable effect was attributed to the release of protons from PDS hydrolysis providing acidic conditions to promote H 2 O 2 activation. 20,21 However, in comparison to the PDS alone system, the enhancement by using the binary oxidants is mild.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Activation of Peroxydisulfate and Hydrogen Peroxide by Sulfidated Nanoscale Zero-Valent Iron for Efficient MTBE Degradation: Significant Role of Oxygen Vacancy

et al. 2023

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Nanoscale zero-valent iron (nZVI)-based advanced oxidation processes (AOPs) are limited by the rapidly formed surface layer of iron (oxyhydr) oxides. This restriction can be broken by the simultaneous activation of H2O2 and peroxydisulfate (PDS, S2O8 2–) over sulfidated nanoscale ZVI (S-nZVI), which displayed a synergistic effect to alleviate the drawbacks of the oxidants used alone. In this work, a biochar-supported S-nZVI (noted as S-nZVI@BC) was employed to simultaneously activate PDS and H2O2 for methyl tert-butyl ether (MTBE) degradation, and the rate constant for S-nZVI@BC/Bi-ox (Bi-ox, bi-oxidant at 1:1 molar ratio of PDS and H2O2) was 3.7-, 4.5-, and 12.8-fold higher than that of nZVI@BC/Bi-ox, S-nZVI@BC/PDS, and S-nZVI@BC/H2O2. According to electron paramagnetic resonance (EPR), X-ray photoelectric spectroscopy (XPS), and in-situ oxygen detection analyses, oxygen vacancies were generated over the shell of S-nZVI@BC during PDS activation, and the oxygen vacancy-contained surface layers promoted H2O2 adsorption and dissociation to produce surface-bound ·OH (·OHads), thus significantly improving H2O2 utilization efficiency and accelerating MTBE degradation. These findings provide promising S-nZVI-based AOPs by combining H2O2 and peroxydisulfate activation for environmental remediation and bring insights for the creation of oxygen vacancy-containing materials for peroxide activation.

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“…In recent years, advanced oxidation processes (AOPs) have received increasing attention owing to their different advantages, such as high oxidation, nonselectivity, and fast reaction rates. 17,18 Sulfate radical-based advanced oxidation processes (SR-AOPs) are processes that degrade large organic substances into small molecules such as CO 2 and H 2 O by activating persulfate (PS) or peroxymonosulfate (PMS) to generate SO 4 c − . 19,20 Usually, PS can be activated to generate SO 4 c − under the conditions of heat, ultraviolet, ultrasound, alkali, and transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

Degradation of ciprofloxacin by persulfate activated with pyrite: mechanism, acidification and tailwater reuse

Hui

Liu

et al. 2022

RSC Adv.

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Synergistic degradation of PNP via coupling H₂O₂ with persulfate catalyzed by nano zero valent iron

Abstract: Simultaneous activation of H2O2 and persulfate by nanoscaled Fe0 shows synergistic effect for degradation of p-nitrophenol with generating both hydroxyl and sulfate radicals in a wide initial pH range.

Cited by 22 publications

References 36 publications

Enhanced Mechanism of Nano Zero-Valent Iron Activated Persulfate for Persistent Organic Pollutants in the Environment

Enhanced Mechanism of Nano Zero-Valent Iron Activated Persulfate for Persistent Organic Pollutants in the Environment

Simultaneous Activation of Peroxydisulfate and Hydrogen Peroxide by Sulfidated Nanoscale Zero-Valent Iron for Efficient MTBE Degradation: Significant Role of Oxygen Vacancy

Degradation of ciprofloxacin by persulfate activated with pyrite: mechanism, acidification and tailwater reuse

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