Activation of oxygen with sulfite for enhanced Removal of Mn(II): The involvement of SO4•-

Rao, Dandan; Sun, Yuankui; Shao, Bin; Qiao, Jinli; Guan, Xiaohong

doi:10.1016/j.watres.2019.03.095

Cited by 64 publications

(28 citation statements)

References 48 publications

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“…The final measured solution pH of Mn(II)/sulfite and electro/Mn(II)/sulfite process with an initial pH of 6 were pH 4.89 and 3.12, respectively. Our results are consistent with a previous report [40]. compound oxidation.…”

Section: Mechanism Studysupporting

confidence: 94%

“…MnO 2 concentration was measured based on a previous report [40]. In detail, 1 mL sampled solution was added into 1 mL 200 µM 2,2 -azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) in 20 mM HEPES buffer (pH 6), and a green ABTS •+ product developed within 5 min.…”

Section: Measurement Of Mno 2 Concentrationmentioning

confidence: 99%

“…•− could be generated and play a significant role in organic compound oxidation in manganese-catalyzed sulfite activation processes, such as permanganate/sulfite, MnO 2 /sulfite, and Mn(II)/sulfite reactions [32][33][34]40 (Figure 7a). It was shown that, as solution pH increased, the produced MnO 2 was improved for both Mn(II)/sulfite and electro/Mn(II)/sulfite processes.…”

Section: Mechanism Studymentioning

confidence: 99%

“…Studies have reported that solution pH might affect the species responsible for organic compound oxidation. For instance, MnO 2 /sulfite reaction at near-neutral pH produces Mn(III) for organic compound removal[34], while Mn(II)/sulfite reaction at acidic pH generates SO 4•− for substrate oxidation[40]. Moreover, the mutual conversion of MnO2 and Mn(II) could be mediated by sulfite (Equations (11)-(14)).…”

mentioning

confidence: 99%

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Electrolysis-Assisted Mn(II)/Sulfite Process for Organic Contaminant Degradation at Near-Neutral pH

Jia

Pei

2019

Water

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Manganese-catalyzed sulfite activation (i.e., Mn(II)/sulfite) has emerged as an advanced oxidation process to produce sulfate radical (SO4•−) for water treatment. However, to maintain the catalytic activity of Mn(II) ion, solution acidity has to be kept below pH 4, which is difficult to maintain in practice. Moreover, Mn(II)/sulfite reaction is a strongly oxygen-dependent process, and purging air into reaction solution is another extra cost. To solve the above issues, we devised to implement electrolysis into Mn(II)/sulfite (i.e., electro/Mn(II)/sulfite process) for organic compound (bisphenol A, BPA) oxidation. It was revealed that, under near-neutral conditions (pH 6), the removal rate of 10 μM BPA was increased from 46.3%, by Mn(II)/sulfite process, to 94.2% by electro/Mn(II)/sulfite process. The enhancement of BPA removal after implementation of electrolysis to Mn(II)/sulfite process was investigated, and concluded to be a result of several pathways. In detail, the produced oxygen from water electrolysis, direct sulfite oxidation on anode, and local acidic pH at anode vicinity together play a role in promoting SO4•− production and, therefore, contaminant removal. Radical-scavenging assays confirmed the dominant role of SO4•− in electro/Mn(II)/sulfite process.

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Section: Mechanism Studysupporting

confidence: 94%

Section: Measurement Of Mno 2 Concentrationmentioning

confidence: 99%

Section: Mechanism Studymentioning

confidence: 99%

mentioning

confidence: 99%

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Electrolysis-Assisted Mn(II)/Sulfite Process for Organic Contaminant Degradation at Near-Neutral pH

Jia

Pei

2019

Water

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“…To identify the major oxidants involved in the C. elegans deactivation by PMS/UV-C, the radicals ( and •OH) and singlet oxygen ( 1 O 2 ) were detected by employing electron paramagnetic resonance (EPR, EM Xplus-10/12, Bruker, Germany) spectroscopy with 25 g/L 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) (Li et al 2018, Nosaka &Nosaka 2017, Rao et al 2019) and 2,2,6,6-tetramethyl-4-piperidinol (TEMP) (Li et al 2018, Yang et al 2018 as the spin traps. The solutions containing 1 mM PMS at pH 6.0 were irradiated for 10 min and heated for 20 min before the EPR measurement.…”

Section: Free Radicals Measurementmentioning

confidence: 99%

Deactivation of Caenorhabditis elegans nematodes in drinking water by PMS/UV-C: efficiency and mechanisms

Chen

et al. 2021

Environ Sci Pollut Res

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The occurrence an d infestations of chlorine-resistant invertebrates in drinking water distributions have attracted concerns on water quality in China, making effective deactivation imperative. This study presents a no vel strategy for nematode ( Caenorhabditis elegans ) deactivation using peroxymonosulfate (PMS)/UV-C. The results indicated that 100% deactivation e ciency was obtained under optimal conditions. An acidic pH and 0.25 mg/L Fe(II) were bene cial to the PMS/UV-C-triggered deactivation of nematodes. A mechanism study demonstrated that was activated by UV-C to produce • OH and • SO 4 -, which resulted in oxidative stress and stimulated the occurrence of cell apoptosis, leading to nematode deactivation. The results reveal PMS/UV-C as an alternative to chlorination in water treatment plants (WTP) or an emergency application when chlorine-resistant invertebrates breed in a second-supply water tank, is a promising strategy for disinfection. This approach afforded the advantages of avoiding the production of chlorine disinfection by-products (DBP) and greater e cacy of nematode deactivation. This work will provide ideas for on-going research efforts into chlorine-resistant invertebrate deactivation, and eventually achieve the direct drinking of municipal tap water.

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Cross‐talk Between (Hydrogen)Sulfite and Metalloproteins: Impact on Human Health

Maiti

2022

Chemistry A European J

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Sulfite is a potent toxic substance causing harm to multi-organ in human. Despite toxicity, it is widely used as preservative, anti-browning and anti-oxidant in foods, beverages, and pharmaceuticals, which cause easy admission of sulfite in human. Sulfite is also produced endogenously during the catabolism of cysteine and methionine. In vivo, the serum sulfite level at physiological range is strictly maintained by a molybdenum dependent sulfite oxidase (SO), which catalyzes sulfite to sulfate oxidation via a two-electron oxidation pathway. The loss of SO activity causes high serum sulfite level that fosters several diseases, including asthma, neurological dysfunction, birth defects, and heart diseases. The cytotoxicity of (bi)sulfite is implicated as sulfite radicals, which are generated by mainly heme-peroxidases via a oneelectron oxidation pathway. On the other hand, the toxic sulfite radicals are neutralized to sulfite by heme-globins. The enzymatic reduction of sulfite to sulfide is catalyzed by sulfite reductase, which contains an unusual metal cofactor, siroheme-[4Fe4S]-cluster. Overall, the interaction of sulfite with various metalloproteins in vivo is a close relation with human health. Therefore, this review describes the metabolic conversion of (bi)sulfite to sulfate, sulfite radical or sulfide via oxidation or reduction pathways by various metalloproteins (specially SOs, peroxidases, heme-globins, and sulfite reductases), and the potential applications of sulfite in biosensors/ biofuel cells, anti-browning, and advance oxidation process.

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Activation of oxygen with sulfite for enhanced Removal of Mn(II): The involvement of SO4•-

Cited by 64 publications

References 48 publications

Electrolysis-Assisted Mn(II)/Sulfite Process for Organic Contaminant Degradation at Near-Neutral pH

Electrolysis-Assisted Mn(II)/Sulfite Process for Organic Contaminant Degradation at Near-Neutral pH

Deactivation of Caenorhabditis elegans nematodes in drinking water by PMS/UV-C: efficiency and mechanisms

Cross‐talk Between (Hydrogen)Sulfite and Metalloproteins: Impact on Human Health

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