A novel sulfite coupling electro-fenton reactions with ferrous sulfide cathode for anthracene degradation

Chu, Longgang; Sun, Zhaoyue; Cang, Long; Fang, Guodong; Wang, Xinghao; Zhou, Dongmei; Gao, Juan

doi:10.1016/j.cej.2020.125945

Cited by 42 publications

(18 citation statements)

References 56 publications

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“…To clarify the influence of pH and verify the effect of sulfite, the amount of • OH produced by hetero-EF/sulfite (initial pH of 7) and hetero-EF (initial pH of 4) was determined (Figure S3(a)). The amount of • OH produced by the former process was smaller than that of the latter at the initial stage because some H 2 O 2 was consumed by sulfite during the early stage of the reaction, and as the reaction proceeded, sulfite was oxidized to the sulfate radical, which was converted into • OH, resulting in the increase in the amount of • OH . Therefore, the higher level of generation of the hydroxyl radical would enhance pollutant degradation and mineralization.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The slow consumption of sulfite under nitrogen indicated that the consumption of sulfite was due to anodic oxidation and FeC activation on one hand and reaction with oxygen on the other (Figure S13d). EPR measurement results showed that there was a mixing signal of DMPO- • OH and DMPO-SO 3 •– with nitrogen aeration (Figure S13e), , indicating SO 3 •– was not converted into SO 4 •– , and the signal intensity of • OH was lower than that of no aeration. As a result, the role of DO was to oxidize sulfite to generate SO 4 •– on one hand and to generate H 2 O 2 through a two-electron ORR at the cathode on the other. …”

Section: Results and Discussionmentioning

confidence: 99%

“…The amount of • OH produced by the former process was smaller than that of the latter at the initial stage because some H 2 O 2 was consumed by sulfite during the early stage of the reaction, and as the reaction proceeded, sulfite was oxidized to the sulfate radical, which was converted into • OH, resulting in the increase in the amount of • OH. 43 Therefore, the higher level of generation of the hydroxyl radical would enhance pollutant degradation and mineralization. When the initial CBZ concentration was 5 mg/ L, the rate constant of hetero-EF/sulfite (initial pH of 7) was 1.51-fold greater than that of hetero-EF (initial pH of 4), 2.42fold greater at 10 mg/L CBZ, and 4.01-fold greater at 20 mg/L CBZ (Figure S3c).…”

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confidence: 99%

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Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Song

Zhou

et al. 2021

ACS EST Water

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Electro-Fenton (EF) has received widespread attention in terms of water decontamination in advanced oxidation processes but still has the bottlenecks of a narrow pH (∼3) application range and a slow rate of reduction of the iron ion to sustain high treatment efficiency. Herein, an iron–carbon catalyst was synthesized to develop a heterogeneous EF/sulfite (hetero-EF/sulfite) process, which expanded the pH application range to 7 and increased the rate constant of carbamazepine (CBZ) degradation 10.74 times compared with that of the hetero-EF process. The catalyst was systematically characterized; important process factors such as the applied current, initial pH, and CBZ, catalyst, and sulfite dosage were investigated, and a possible degradation mechanism and a possible pathway were proposed. The quenching experiments and electron paramagnetic resonance test revealed the existence of active species such as •OH, SO4 •–, O2 •–, 1O2, and their mutual transformation, in which •OH and O2 •– were dominant. This work also verified the suitability of the hetero-EF/sulfite for different pollutants, and its universal enhancement for different heterogeneous and homogeneous catalysts. This modified EF process expands the pH application range and enables the co-generation and transformation of free radicals, which has broad prospects for application in the effective degradation of organic pollutants for water purification.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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confidence: 99%

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Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Song

Zhou

et al. 2021

ACS EST Water

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“…Meanwhile, in well-buffered circumneutral environments such as fresh water sediments, salt marsh, and wastewater remediation, − the pyrite oxidation process and the generate pathway of ROS (i.e., • OH) are entirely different thanks to the hydrolytic precipitation of Fe(III) and the inhibition of the homogeneous Fenton process. Most of the current studies emphasized the indispensable role of surface-adsorbed ferrous ions (hereinafter referred to as Fe( II ) ad ) on pyrite oxidation, − corresponding to the Extending Singer–Stumm Model proposed by Moses and Herman in 1991, who point that the presence of Fe( II ) ad accelerates pyrite oxidation and describe Fe( II ) ad as the electron transfer “conduit” between pyrite and oxidants . Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

Redox Behavior of Secondary Solid Iron Species and the Corresponding Effects on Hydroxyl Radical Generation during the Pyrite Oxidation Process

Zhao

Peng

et al. 2022

Environ. Sci. Technol.

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During the pyrite oxidation process, aqueous ferrous/ferric ions (Fe 2+ /Fe 3+ ), as well as surface-adsorbed Fe 2+ /Fe 3+ , have been widely recognized to dominate hydroxyl radical ( • OH) generation, while this study reveals that the secondary solid iron species also play nonnegligible roles. Based on the different forms and the presence of sites, the secondary solid iron species were classified as Fe coat (iron-containing coating on the pyrite surface) and Fe dep (ex situ-deposited iron (oxyhydr)oxide that is not in contact with pyrite). Instead of participating in building a stubborn passivation layer on the pyrite surface, Fe coat is easy to fall off from the pyrite surface as the oxidation of pyrite deepens, while large fractions of Fe dep and Fe coat are found to be extractable with nitrilotriacetic acid (NTA). Achieved by cyclically oxidizing pyrite within different NTA levels (0/0.1/10 mM), Fe coat and Fe dep were proved to have distinct redox behavior during the pyrite oxidation process. Amorphous Fe dep , originated from the hydrolyzation of dissolved Fe 3+ , accelerates the nonradical decay of hydrogen peroxide (H 2 O 2 ); as a result, the accumulation of Fe dep always decreases the • OH production during the pyrite oxidation process. However, part of Fe dep adsorbs on the pyrite surface through electrostatic attraction and converts into Fe coat . The electron conduction between Fe coat and pyrite was verified, which accelerates the oxidative dissolution of pyrite, produces reactive Fe(II), and therefore favors • OH generation. This study improves our understanding of the redox behavior of pyrite in complex media such as natural processes and practical engineering systems.

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“…The advanced oxidation process proves its effectiveness in the degradation of polycyclic aromatic hydrocarbons. However during this process, many different oxidized derivatives are formed [13,14,15]. For most PAHs, reaction in the gas phase occurs with the addition of OH radical, NO3 radical or O3 to the aromatic rings.…”

Section: Introductionmentioning

confidence: 99%

Destruction of anthracene and phenanthrene using PDS/UV, one of advanced oxidation processes in terms of degree of destruction and by-products

2022

Global NEST: The International Journal

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<p>Anthracene and phenanthrene belong to a group of persistent environmental contaminants called PAHs. Evaluation of the structure of two selected PAHs i.e. anthracene and phenanthrene on their resistance to destruction by UV-activated PDS was the aim of this study. The authors focused on two aspects of this problem: - the role of the so-called ‘bay-region’, in the structure of phenanthrene, during PDS/UV oxidation - formation of substituted forms of these PAHs in the absence and presence of three nitrogen-containing compounds i.e. ammonia and nitrite or nitrate ions. Even though phenanthrene and anthracene have the same molecular formula, the difference in their ring assessment influences their degradability. Considering all the results, in all the cases anthracene was degraded faster and/or had a higher degradation rate. That proves phenanthrene to be more stable and resistant for degradation however comparison of PDS/UV systems vs. UV– irradiation alone confirms that the addition of PDS accelerates the degradation of anthracene and phenanthrene. Comparison of PDS/UV with the addition of three different nitrogen-containing compounds showed a significant difference between anthracene and phenanthrene. In the experiments with phenanthrene were observed additional peaks with an absorption maximum between 230-240 cm-1 which is characteristic of the nitro-group. Based on their absorption maximum and the addition of nitrogen-containing compounds, emerging by-products are assumed to be nitro-derivatives of phenanthrene. The results of GC/MS analysis suggest the possibility of formation of many compounds which can be formed from phenanthrene and are embedded on its skeleton. These analyzes also suggest the rearrangement of phenanthrene’s aromatic rings and formation new compounds.</p>

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A novel sulfite coupling electro-fenton reactions with ferrous sulfide cathode for anthracene degradation

Cited by 42 publications

References 56 publications

Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Mechanistic Insight into the Heterogeneous Electro-Fenton/Sulfite Process for Ultraefficient Degradation of Pollutants over a Wide pH Range

Redox Behavior of Secondary Solid Iron Species and the Corresponding Effects on Hydroxyl Radical Generation during the Pyrite Oxidation Process

Destruction of anthracene and phenanthrene using PDS/UV, one of advanced oxidation processes in terms of degree of destruction and by-products

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