Enhanced degradation of organic contaminants by Fe(III)/peroxymonosulfate process with l-cysteine

Qi, Chengdu; Wen, Yanni; Zhao, Yijie; Dai, Yinhao; Li, Yanping; Xu, Chenmin; Yang, Shaogui; He, Huan

doi:10.1016/j.cclet.2021.10.087

Cited by 62 publications

(19 citation statements)

References 15 publications

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“…These two processes could reduce the yield of hydroxyl radicals, thus significantly inhibiting the removal of AO7. Similarly, some other researchers also reported that HA could significantly inhibit the degradation of AO7 in the one Fe (III)/peroxymonosulfate/1‐cysteine AOP system (Qi et al, 2021).

HA goodbreak+ • OH \to {HA}_{products} goodbreak+ OH

…”

Section: Resultsmentioning

confidence: 72%

Study on the catalytic degradation of Acid Orange 7 and the potential mechanism by ferrous–percarbonate

Huang

Wang

Ruan

2022

Water Environment Research

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Factors affecting the degradation of Acid Orange 7 (AO7) were evaluated and optimized when ferrous was used to catalyze percarbonate in the present study. The optimized conditions included the initial pH values ranging from 3 to 11 for AO7 solution, the initial level of AO7, sodium percarbonate (SPC), and Fe 2+ . Some ions and natural organic materials, which commonly exist in natural water, were also tested to evaluate their potential impacts on the degradation of AO7. The degradation efficiency of AO7 was up to 95% under the optimized test conditions, where the ferrous/percarbonate/AO7 molar ratio was 15/10/1 in the 0.285 mmol/l AO7 aqueous solution. The presence of Cl À , SO 4 2À , NO 3 À , Na + , and Mg 2+ did not affect the removal of AO7. The addition of HCO 3 À significantly inhibited its removal, even when the concentration of HCO 3 À was low to 0.6 mmol/l. A slight inhibition effect was observed when the added concentration of humic acid ranged from 0.5 to 5 mg/l, whereas the residue of AO7 was significantly enhanced when the level of humic acid was continually increased from 50 to 100 mg/l. Hydroxyl radicals (•OH) were the main reactive intermediates controlling the oxidation of AO7 in the present Fe 2+ /SPC system. The produced intermediates through the degradation of AO7 were identified to include 2-coumaranone, 2-naphthol, phthalic acid, phthalimide, N-methylnaphthylamine, and 2-methylphenol. The proposed degradation pathways are consistent with the radical formation and the identified intermediates. Practitioner Points• The ferrous/percarbonate system can remove 95% of AO7 under the optimized conditions. • AO7 removal was inhibited by adding HCO 3 À and humic acid, but not affected by Cl À , SO 4 2À , NO 3 À , Na + , and Mg 2+ .• Hydroxylation, ring opening, and mineralization driven by the generated hydroxyl radicals were derived as the major processes for degrading AO7.

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HA goodbreak+ • OH \to {HA}_{products} goodbreak+ OH

…”

Section: Resultsmentioning

confidence: 72%

Study on the catalytic degradation of Acid Orange 7 and the potential mechanism by ferrous–percarbonate

Huang

Wang

Ruan

2022

Water Environment Research

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“…However, due to the very low redox potential of Fe III /Fe II (0.8 V), the reduction of Fe III into Fe II is extraordinarily ineffective. 57 For example, Fe 2+ /PMS only exhibited a significant oxidation performance in the preliminary stage, which is largely different from that of Co 2+ /PMS due to the Co III /Co II (1.9 V) redox cycle being spontaneous in the PMS solution ( Figure S6 A). 58 However, the XPS spectrum after reaction emphasized that the center of Fe 2p 3/2 was still positioned at a low binding energy (711.2 eV), indicating that Fe atoms still exist in a low redox state after reaction ( Figure S1 H).…”

Section: Resultsmentioning

confidence: 97%

Spontaneous FeIII/FeII redox cycling in single-atom catalysts: Conjugation effect and electron delocalization

Zheng¹,

Wang²,

Dzakpasu³

et al. 2023

iScience

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“…•À possesses electrophilic properties and exhibits selectivity towards electron-rich groups such as amines, hydroxyls, and alkoxy groups in organic compounds, enabling the targeted removal of specific pollutants (Qi et al, 2022). Based on these characteristics, SO 4…”

Section: Formation Of Heterojunctionmentioning

confidence: 99%

The synergistic degradation of pollutants in water by photocatalysis and PMS activation

Yueyu

2023

Water Environment Research

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In recent years, the synergistic degradation of water pollutants through advanced oxidation technology has emerged as a prominent research area due to its integration of various advanced oxidation technologies. The combined utilization of peroxymonosulfate (PMS) activation technology and photocatalysis demonstrates mild and nontoxic characteristics, enabling the degradation of water pollutants across a wide pH range. Moreover, this approach reduces the efficiency of electron hole recombination, broadens the catalyst's light response range, facilitates electron transfer of PMS, and ultimately improves its photocatalytic performance. The paper reviews the current research status of photocatalytic technology and PMS activation technology, respectively, while highlighting the advancements achieved through the integration of photocatalytic synergetic PMS activation technology for water pollutant degradation. Furthermore, this review delves into the mechanisms involving both free radicals and non‐radicals in the reaction process, and presents a promising prospect for future development in water treatment technology.

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Enhanced degradation of organic contaminants by Fe(III)/peroxymonosulfate process with l-cysteine

Cited by 62 publications

References 15 publications

Study on the catalytic degradation of Acid Orange 7 and the potential mechanism by ferrous–percarbonate

Study on the catalytic degradation of Acid Orange 7 and the potential mechanism by ferrous–percarbonate

Spontaneous FeIII/FeII redox cycling in single-atom catalysts: Conjugation effect and electron delocalization

The synergistic degradation of pollutants in water by photocatalysis and PMS activation

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