Enhanced degradation of emerging contaminants by permanganate/quinone process: Case study with bisphenol A

Dong, Zheng-Yu; Lin, Yi-Li; Zhang, Tianyang; Hu, Chen-Yan; Pan, Yang; Zheng, Zheng-Xiong; Tang, Yongchun; Xu, Bin; Gao, Naiyun

doi:10.1016/j.watres.2022.118528

Cited by 22 publications

(8 citation statements)

References 56 publications

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“…In recent work, 1 O 2 generated from the reaction of KMnO 4 and benzoquinone (BQ, one characteristic component of HA) was proposed to explain the promoting effect of HA on KMnO 4 oxidation. 21 To explore the contribution of 1 O 2 , the impact of NaN 3 , which is a quencher for 1 O 2 , on the degradation of DCF was examined. However, a negligible influence of NaN 3 was observed (Figure 2a).…”

Section: Mechanism For the Enhanced Degradation Of Dcf In The Kmnomentioning

confidence: 99%

New Insights into the Role of Humic Acid in Permanganate Oxidation of Diclofenac: A Novel Electron Transfer Mechanism

Zhou,

Zeng,

et al. 2024

Environ. Sci. Technol.

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Humic acid (HA) ubiquitously existing in aquatic environments has been reported to significantly impact permanganate (KMnO 4 ) decontamination processes. However, the underlying mechanism of the KMnO 4 /HA system remained elusive. In this study, an enhancing effect of HA on the KMnO 4 oxidation of diclofenac (DCF) was observed over a wide solution pH range of 5−9. Surprisingly, the mechanism of HA-induced enhancement varied with solution pH. Quenching and chemical probing experiments revealed that manganese intermediates (Mn(III)-HA and MnO 2 ) were responsible for the enhancement under acidic conditions but not under neutral and alkaline conditions. By combining KMnO 4 decomposition, galvanic oxidation process experiments, electrochemical tests, and FTIR and XPS analysis, it was interestingly found that HA could effectively mediate the electron transfer from DCF to KMnO 4 in neutral and alkaline solutions, which was reported for the first time. The formation of an organic−catalyst complex (i.e., HA-DCF) with lower reduction potential than the parent DCF was proposed to be responsible for the accelerated electron transfer from DCF to KMnO 4 . This electron transfer likely occurred within the complex molecule formed through the interaction between HA-DCF and KMnO 4 (i.e., HA-DCF-KMnO 4 ). These results will help us gain a more comprehensive understanding of the role of HA in the KMnO 4 oxidation processes.

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Section: Mechanism For the Enhanced Degradation Of Dcf In The Kmnomentioning

confidence: 99%

New Insights into the Role of Humic Acid in Permanganate Oxidation of Diclofenac: A Novel Electron Transfer Mechanism

Zhou,

Zeng,

et al. 2024

Environ. Sci. Technol.

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“…9 But there remains disagreement regarding how HA accelerates Mn(VII) oxidation, and the available mechanisms can be consolidated as follows: (i) HA acted as a reducing agent, inducing the conversion of Mn(VII) into manganese intermediates (i.e., MnO 2 and Mn(III)) with increased reactivity to pollutants. 10,11 (ii) HA acted as a ligand to form a complex with Mn(III), preventing its disproportionation. 12 In addition, the HA-Mn(III) complex might trigger the sequential generation of superoxide radicals (O 2 • − ) and HO•, which assisted in the organics elimination.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moreover, most research on HA/Mn(VII) has commonly investigated HA as an entity to infer the impact of HA on the degradation kinetics of contaminants in Mn(VII) oxidation (i.e., reduction or complexation effects). 11 Nevertheless, this analytical approach is imprecise, as not all of the HA's constituents react with Mn(VII). Thus, methods for determining the selective oxidation of Mn(VII) to HA constituents and distinguishing between oxidizable and nonoxidizable sections of HA components are urgently needed.…”

Section: ■ Introductionmentioning

confidence: 99%

Unraveling the Role of Humic Acid in the Oxidation of Phenolic Contaminants by Soluble Manganese Oxo-Anions

Wang,

Chai,

et al. 2024

Environ. Sci. Technol.

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Humic acid (HA) is ubiquitous in natural aquatic environments and effectively accelerates decontamination by permanganate (Mn(VII)). However, the detailed mechanism remains uncertain. Herein, the intrinsic mechanisms of HA's impact on phenolics oxidation by Mn(VII) and its intermediate manganese oxo-anions were systematically studied. Results suggested that HA facilitated the transfer of a single electron from Mn(VII), resulting in the sequential formation of Mn(VI) and Mn(V). The formed Mn(V) was further reduced to Mn(III) through a double electron transfer process by HA. Mn(III) was responsible for the HA-boosted oxidation as the active species attacking pollutants, while Mn(VI) and Mn(V) tended to act as intermediate species due to their own instability. In addition, HA could serve as a stabilizer to form a complex with produced Mn(III) and retard the disproportionation of Mn(III). Notably, manganese oxo-anions did not mineralize HA but essentially changed its composition. According to the results of Fourier-transform ion cyclotron resonance mass spectrometry and the second derivative analysis of Fourier-transform infrared spectroscopy, we found that manganese oxo-anions triggered the decomposition of C−H bonds on HA and subsequently produced oxygen-containing functional groups (i.e., C−O). This study might shed new light on the HA/manganese oxo-anion process.

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“…The emerging organic pollutants (EOPs), e.g., pharmaceuticals and personal care products (PPCPs), endocrine-disrupting chemicals (EDCs), and antibiotic resistance genes (ARGs), have been detected in the global aquatic environment. − EOPs threat human health and the aquatic ecosystem even at the ng/L concentration with long-term exposure . Technology innovation on selective elimination of the EOPs is urgent and has attracted intensive research interests. , The peroxymonosulfate (PMS)-based advanced oxidation process is promising in water treatment application, and the solid form of PMS salt offers ease and safety in the transportation and operation process. − Most importantly, the catalytic PMS activation process has been identified to be sensitively influenced by the properties of the catalyst, offering various reactive species and reaction pathways. − To be sustainable and economically advantageous, the materials in the catalytic process for water treatment should be preferably composed of earth-abundant elements. Iron, with the features of earth abundance, low-cost, and environmental friendliness, is the most suitable candidate for the PMS activation toward the selective degradation of EOPs .…”

Section: Introductionmentioning

confidence: 99%

“…5 Technology innovation on selective elimination of the EOPs is urgent and has attracted intensive research interests. 3,6 The peroxymonosulfate (PMS)-based advanced oxidation process is promising in water treatment application, and the solid form of PMS salt offers ease and safety in the transportation and operation process. 7−11 Most importantly, the catalytic PMS activation process has been identified to be sensitively influenced by the properties of the catalyst, offering various reactive species and reaction pathways.…”

Section: ■ Introductionmentioning

confidence: 99%

Efficient Single-Atom Fe-Catalyzed Fenton-like Reaction Involving Peroxymonosulfate for BPA Degradation by High-Valent Fe(IV)=O

et al. 2022

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Catalytic activation of peroxymonosulfate is one of the most promising advanced oxidation processes for water treatment. The development of advanced functional catalysts is essential to efficient and selective elimination of the emerging organic pollutants in water. Via a facile one-step method using the naturally abundant tannic acid and low-cost melamine as precursors, the atomically dispersed Fe was anchored on a nitrogen-doped carbon matrix, and the configuration of Fe-N 4 was confirmed by synchrotron X-ray absorption spectroscopy. The singleatom Fe catalyst was efficient in catalytic degradation of various organic pollutants, e.g., removal of 100 μM BPA within 40 s under mild reaction conditions. The essential role of high-valent iron-oxo species in selective degradation of pollutants was identified by systematic mechanistic investigations. This work demonstrates the unique advantages of high-valent Fe IV =O in selective elimination of emerging organic pollutants and sheds light on the design of an efficient and durable single-atom catalyst for a variety of applications.

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Enhanced degradation of emerging contaminants by permanganate/quinone process: Case study with bisphenol A

Cited by 22 publications

References 56 publications

New Insights into the Role of Humic Acid in Permanganate Oxidation of Diclofenac: A Novel Electron Transfer Mechanism

New Insights into the Role of Humic Acid in Permanganate Oxidation of Diclofenac: A Novel Electron Transfer Mechanism

Unraveling the Role of Humic Acid in the Oxidation of Phenolic Contaminants by Soluble Manganese Oxo-Anions

Efficient Single-Atom Fe-Catalyzed Fenton-like Reaction Involving Peroxymonosulfate for BPA Degradation by High-Valent Fe(IV)=O

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