Bisulfite triggers fast oxidation of organic pollutants by colloidal MnO2

Sun, Bo; Xiao, Zhongjin; Dong, Hongyu; Ma, Shangchen; Wei, Guangfeng; Cao, Tongcheng; Guan, Xiaohong

doi:10.1016/j.jhazmat.2018.10.002

Cited by 49 publications

(26 citation statements)

References 63 publications

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“…For KMnO 4 /NH 2 OH·HCl system, although an inhibitory effect of PP was observed, the involvement of Mn(III) should also be excluded considering the free Mn(III) species are quite short‐lived Mn(III), which will undergo disproportion to Mn(II) and Mn(IV) very quickly in the absence of chelating agents (Klewicki & Morgan, ). In specific, the reaction between KMnO 4 and NH 2 OH·HCl could be completed within 2 min, so if Mn(III) was generated and played a key role in degrading SMX, an obvious SMX degradation should be obtained within 2 min since Mn(III) was reported to be able to oxidase SMX within 10 s (Sun et al, ). However, negligible SMX was removed actually within this short timescale and most of the SMX degradation appeared during the following 28 min, as illustrated in Figures and .…”

Section: Resultsmentioning

confidence: 99%

Role of pyrophosphate on the degradation of sulfamethoxazole by permanganate combined with different reductants: Positive or negative

Liu

Yin

Guan

et al. 2019

Water Environment Research

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Activating permanganate with reductants has gained increasing attention recently for efficient organic contaminants abatement via reactive intermediate Mn species. However, few studies have been conducted to explore the role of pyrophosphate (PP), a typical complexing agent for intermediate Mn species, in activated permanganate systems. In this study, taking sulfamethoxazole (SMX) as a probe compound, the influences of PP on SMX degradation by permanganate/thiosulfate and permanganate/hydroxylamine were extensively studied. It was found that both thiosulfate and hydroxylamine were able to activate permanganate for oxidation of SMX in the absence of PP. However, upon the introduction of PP, opposite effects were observed in the two systems where PP further improved the activation of permanganate by thiosulfate but dampened the performance of permanganate/hydroxylamine markedly. For permanganate/hydroxylamine system, MnO2 was determined to be the only reactive oxidative species accounting for SMX degradation in the absence of PP, and its generation could be completely inhibited by PP. While in permanganate/thiosulfate system, both Mn(V) and MnO2 were responsible for SMX oxidation, and the introduction of PP could strengthen the oxidative ability of Mn(V). These results could shed some insights on the suitability of applying PP to explore the kinetics and mechanisms of manganese involved redox reactions. Practitioner points Both Na2S2O3 and NH2OH·HCl can activate KMnO4 for SMX removal without PP. MnO2 is the reactive oxidative species involved in KMnO4/NH2OH·HCl system. Mn(V) and MnO2 account for the SMX oxidation by KMnO4/Na2S2O3 system. PP could inhibit the formation of MnO2 but enhance the oxidative ability of Mn(V).

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Section: Resultsmentioning

confidence: 99%

Role of pyrophosphate on the degradation of sulfamethoxazole by permanganate combined with different reductants: Positive or negative

Liu

Yin

Guan

et al. 2019

Water Environment Research

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“…•− with relatively high activity [45] is an electrophilic oxidant [34]. This method has been widely used to distinguish if SO 4…”

Section: Mechanism Studymentioning

confidence: 99%

“…Ethanol could react with SO4 •− with relatively high activity [45], while tert-butanol is inert toward SO4 •− [46]. Besides, ethanol and tert-butanol are reported to be both inert to Mn(III), as Mn(III) is an electrophilic oxidant [34]. This method has been widely used to distinguish if SO4 •− plays a role in certain oxidation process [47][48][49][50].…”

Section: Mechanism Studymentioning

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%

“…•− , Mn(II)/sulfite reaction also generates Mn(III), a strongly oxidative species that has been recently reported to rapidly oxidize a variety of organic compounds [32][33][34].…”

Section: Introductionmentioning

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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Kinetics of oxidation of vanillic acid by colloidal MnO2: correlation of micellar catalysis to the micellar properties of surfactants and mixed surfactants

Hassan

Dahadha

Al-Dhoun

et al. 2021

Reac Kinet Mech Cat

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Bisulfite triggers fast oxidation of organic pollutants by colloidal MnO2

Cited by 49 publications

References 63 publications

Role of pyrophosphate on the degradation of sulfamethoxazole by permanganate combined with different reductants: Positive or negative

Role of pyrophosphate on the degradation of sulfamethoxazole by permanganate combined with different reductants: Positive or negative

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

Kinetics of oxidation of vanillic acid by colloidal MnO2: correlation of micellar catalysis to the micellar properties of surfactants and mixed surfactants

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