Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol

Hussain, Imtyaz; Li, Mingyu; Zhang, Yongqing; Li, Yi-Chun; Huang, Shaobin; Du, Xiaoming; Liu, Guoqiang; Hayat, Waseem; Anwar, Nazia

doi:10.1016/j.cej.2016.11.085

Cited by 317 publications

(75 citation statements)

References 52 publications

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“…). These results indicate that biochar played a catalytic role in the activation of persulfate, which is consistent with previous results . As shown in Eqns (1)–(5), Fe(0) can activate persulfate to generate radicals that enhance oxidation of phenol.…”

Section: Resultssupporting

confidence: 92%

“…). Previous reports explain the activation of persulfate by biochar in two ways: surface functional groups (as a form of persistent free radical) and delocalized electrons in graphitic regions in biochar …”

Section: Resultsmentioning

confidence: 99%

“…These results indicate that biochar played a catalytic role in the activation of persulfate, which is consistent with previous results. 17,41 As shown in Eqns (1)-(5), Fe(0) can activate persulfate to generate radicals that enhance oxidation of phenol. Under the given conditions, approximately 35% of the phenol was decomposed in the Fe(0)-persulfate system.…”

Section: Phenol Oxidation By Persulfate Activated With Fe(0) and Biocharmentioning

confidence: 99%

“…Previous reports explain the activation of persulfate by biochar in two ways: surface functional groups (as a form of persistent free radical) and delocalized electrons in graphitic regions in biochar. 17,[39][40][41] First, oxygen-containing functional groups on the surface of biochar can act as electron shuttles to mediate electron transfer reactions, decomposing persulfate and generating radicals [42][43][44][45][46] according to the following equations (Eqns (8) and (9)):…”

Section: Oxidation Mechanisms and Implicationmentioning

confidence: 99%

“…It was previously reported that oxygen-containing functional groups such as -COOH and -OH on the surface of biochar acted as electron transfer mediators to active persulfate. 17,41 Second, electron-rich or -deficient particles due to delocalized electrons on the surface of biochar can activate persulfate to generate sulfate radicals. Carbonaceous materials contain sp 2 -hybridized graphitic structures, which have large numbers of free-flowing electrons.…”

Section: Oxidation Mechanisms and Implicationmentioning

confidence: 99%

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Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Nguyen

2019

J of Chemical Tech & Biotech

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BACKGROUND Biochar, a by‐product of the pyrolysis of biomass, was used to investigate activation of persulfate in the presence of zero‐valent iron, Fe(0), for the purposes of phenol degradation. Relevant factors of pH, persulfate concentration, and type of black carbon (biochar, activated carbon, and graphite) were examined. RESULTS Maximal removal of phenol was obtained at an initial pH of 2 in Fe(0)–biochar–persulfate systems. At a pH of 7, 89% of the phenol was degraded, with 2.60 mmol L−1 of persulfate, 300 mg of Fe(0), and 100 mg of biochar. Under optimal conditions, more than 95% of phenol degraded after 330 min. Electron paramagnetic resonance analysis showed that sulfate radical (SO4−·) and hydroxyl radical (·OH) were involved in phenol degradation. A graphitic structure arising from a sp2 covalent carbon network and oxygen‐containing functional groups on biochar were responsible for enhancement of phenol degradation. CONCLUSIONS Our study suggests that biochar‐mediated oxidation by persulfate with Fe(0) may be an effective treatment technology for removal of phenol from natural and engineered aquatic systems. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Phenol Oxidation By Persulfate Activated With Fe(0) and Biocharmentioning

confidence: 99%

Section: Oxidation Mechanisms and Implicationmentioning

confidence: 99%

Section: Oxidation Mechanisms and Implicationmentioning

confidence: 99%

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Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Nguyen

2019

J of Chemical Tech & Biotech

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Critical Review on Biochar‐Supported Catalysts for Pollutant Degradation and Sustainable Biorefinery

Kumar

Xiong

Sun

et al. 2020

Advanced Sustainable Systems

100

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Structurally modified CuFe₂O₄/persulfate process for acetaminophen scavenging: high efficiency with low catalyst addition

Zhang

Dong

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: Iron (Fe)-copper (Cu) bimetallic catalysts such as CuFe 2 O 4 , CuFeO 2 and CuO/Fe 3 O 4 have been widely applied in persulfate oxidization process. Among these catalysts, CuFe 2 O 4 has shown excellent performance in catalyzing peroxymonosulfate. However, because the catalytic effect of CuFe 2 O 4 on persulfate (PS) is not obvious, the application of CuFe 2 O 4 to activate persulfate has been investigated only rarely. Hence, structural modification has been applied in order to improve the catalytic activity of CuFe 2 O 4 on persulfate.RESULT: In this study, Oxygen (O)-deficient CuFe 2 O 4 was synthesized via the hydrogen reduction method and first used to activate PS for degrading acetaminophen (APAP) in aqueous solution with low catalyst concentration of 0.3 g L −1 . Results reveal that high-concentration APAP (100 mg L −1 ) could be efficiently removed by O-deficient CuFe 2 O 4 -activated PS, and 91% removal rate could be reached in 60 min using 0.8 g L −1 PS and 0.3 g L −1 catalyst under unadjusted pH. Dissolved O 2 and Cl − showed inhibitory effects on the degradation process. Radical scavenger experiments, in which methanol, tert-butyl alcohol (TBA) and nitrobenzene (NB) were used as radical trappers, indicated that SO 4 − and OH were the active radicals in the reaction, but the main radical was SO 4 − . Oxygen-deficient CuFe 2 O 4 showed strong reduction ability and could activate PS efficiently, and the electron transfer capability was remarkably enhanced after this structural modification. CONCLUSIONS: Results indicated that compared to the pristine crystal, the catalytic activity of CuFe 2 O 4 could be improved through structural modification. Additionally, the structurally modified catalyst showed high potential to treat wastewater with high antibiotic content under mild conditions. Romero A. Oxidation of priority and emerging pollutants with persulfate activated by iron: effect of iron valence and particle size. Chem Eng J 318:197-205 (2017).J Chem Technol Biotechnol 2019; 94: 785-794

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Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol

Cited by 317 publications

References 52 publications

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Critical Review on Biochar‐Supported Catalysts for Pollutant Degradation and Sustainable Biorefinery

Structurally modified CuFe₂O₄/persulfate process for acetaminophen scavenging: high efficiency with low catalyst addition

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Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol

Cited by 317 publications

References 52 publications

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Biochar‐mediated oxidation of phenol by persulfate activated with zero‐valent iron

Critical Review on Biochar‐Supported Catalysts for Pollutant Degradation and Sustainable Biorefinery

Structurally modified CuFe2O4/persulfate process for acetaminophen scavenging: high efficiency with low catalyst addition

Contact Info

Product

Resources

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Structurally modified CuFe₂O₄/persulfate process for acetaminophen scavenging: high efficiency with low catalyst addition