Efficient oxidation of phenol by persulfate using manganite as a catalyst

Yang, Li; Liu, Lin-Dong; Liu, Lu; Liu, Ying; Zhang, Hongwei; Han, Xu

doi:10.1016/j.molcata.2015.10.036

Cited by 62 publications

(9 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As such, it provides an alternative hemin-catalyzed aerobic oxidation protocol for phenol-hydrazone [3+3] cycloaddition likely with a different ionic mechanistic scenario. This is probably ascribed to the deprotonated phenol possessing an increased electron density that favors two-electron transfer oxidation, which is in accordance with the reported pH-dependent phenol oxidation mechanism …”

supporting

confidence: 89%

Hemin-Catalyzed Oxidative Phenol-Hydrazone [3+3] Cycloaddition Enables Rapid Construction of 1,3,4-Oxadiazines

et al. 2020

View full text Add to dashboard Cite

Herein, we present a hemin-catalyzed oxidative phenol-hydrazone [3+3] cycloaddition that accommodates a broad spectrum of N-arylhydrazones, a class of less exploited 1,3-dipoles due to their significant Lewis basicity and weak tendency to undergo 1,2-prototropy to form azomethine imines. It renders expedient assembly of diversely functionalized 1,3,4-oxadiazines with excellent atom and step economy. Preliminary mechanistic studies point to the involvement of a one-electron oxidation pathway, which likely differs from the base-promoted aerobic oxidative scenario.

show abstract

supporting

confidence: 89%

Hemin-Catalyzed Oxidative Phenol-Hydrazone [3+3] Cycloaddition Enables Rapid Construction of 1,3,4-Oxadiazines

et al. 2020

View full text Add to dashboard Cite

show abstract

“…•− and •OH to phenol oxidation. 49 In the presence of 1.0 M TBA or 1.0 M methanol, the corresponding k obs values slightly decrease from 2.57 × 10 −1 to 2.43 × 10 −1 min −1 or from 2.57 × 10 −1 to 2.27 × 10 −1 min −1 , implying the insignificant roles of SO 4…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Selective Oxidation of Various Phenolic Contaminants by Activated Persulfate via the Hydrogen Abstraction Pathway

et al. 2021

Self Cite

View full text Add to dashboard Cite

Enzymatic polymerization of phenolic contaminants to polyphenolics by H2O2 is an effective method to turn phenolic wastes to useful polymers. However, the sensitivities and the high costs of enzymes always limit their applications in the long-run treatment of industrial wastewater. In this study, a highly efficient CuO-persulfate (PS) system is reported to be a promising candidate for enzyme–H2O2 and shows high reactivity to polymerize various phenolic contaminants to polymers under alkaline conditions with the ratio of PS/phenolics less than 2.0. Compared with the generally accepted mechanism that the oxidizing species of SO4 •– and ·OH generated during PS activation primarily contribute to the oxidation of various organic contaminants, quenching experiments, EPR (electron paramagnetic resonance) analysis and DFT calculations in this study indicate that PS is activated on CuO via a nonradical pathway under alkaline conditions, and the O–O bond in PS is moderately elongated from 1.45 to 1.58 Å. The inversely linear relationship between log k obs and BDEO–H values of various phenolics in the Hammett plot confirms H-abstraction from various phenolics under alkaline conditions. DFT calculations further reveal the formation of phenolic radicals after the activated PS abstracts H from phenolic −OH, followed by subsequent polymerization of phenoxyl radicals to polyphenolics. Characterizations of the oxidation products confirm that more than 80% phenolic contaminants have been transformed to polyphenolics. This study provides a new alternative for recovering various phenolic contaminants from industrial wastewater.

show abstract

“…Recently, number of research works have studied the use of transition metal (Cu, Fe and Mn)-bearing minerals to catalyze the decomposition of persulfate and degrade organic compounds in waters [14,[21][22][23][24][25][26][27][28]. However, persulfate activation mechanism at oxide surfaces and generation pathways of reactive oxygen species (e.g.…”

Section: Introductionmentioning

confidence: 99%

Activation of persulfate by Fe(III) species: Implications for 4-tert-butylphenol degradation

Prulho

Brigante

et al. 2017

Journal of Hazardous Materials

102

View full text Add to dashboard Cite

In this study, the activation of persulfate induced by Fe(III) species, including 5 kinds of iron oxhydroxides (IOs) and dissolved Fe under dark condition were investigated. Ferrihydrite (FH) and akaganeite (AK) showed the highest activity in 4-tert-butylphenol (4tBP) removal. The 4tBP degradation rate constant decreased as the solution pH increased from pH 3.2 to 7.8 in FH/SO system. However, the pH value had no significant effect on the 4tBP degradation in AK/SO system. The degradation of 4tBP in Fe/SO system was also performed to investigate the role of ferric species in persulfate activation. The pH dependency of 4tBP degradation rate was closely related to the speciation of Fe, whereas the Fe(HO) was found to be the most active soluble iron complex form in the activation of SO. 4tBP degradation was mainly due to the SO in IOs/SO system, while SO and HO both had great contribution on 4tBP degradation in Fe/SO system. Further investigations showed clearly that 4tBP degradation efficiency was decreased significantly due to the trapping of SO by chloride. This finding may have promising implications in developing a new technology for the treatment of contaminated waters and soils, especially where Fe species are naturally occurring.

show abstract

Efficient oxidation of phenol by persulfate using manganite as a catalyst

Cited by 62 publications

References 40 publications

Hemin-Catalyzed Oxidative Phenol-Hydrazone [3+3] Cycloaddition Enables Rapid Construction of 1,3,4-Oxadiazines

Hemin-Catalyzed Oxidative Phenol-Hydrazone [3+3] Cycloaddition Enables Rapid Construction of 1,3,4-Oxadiazines

Selective Oxidation of Various Phenolic Contaminants by Activated Persulfate via the Hydrogen Abstraction Pathway

Activation of persulfate by Fe(III) species: Implications for 4-tert-butylphenol degradation

Contact Info

Product

Resources

About