Effects of oxidative coupling reaction of 4-chlorophenol with manganese oxide on the phenanthrene sorption

Ko, Seok‐Oh; Jun, Sun-Young; Lee, Do‐Hoon; Park, Jae-Woo; Shin, Won Sik

doi:10.1080/10934520601134064

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…Zeta potential values of PCN-0.5 were positive below pH 3.5 (inset of Figure S10b), suggesting the surface of PCN-0.5 is positively charged at pH < 3.5 due to the protonation of electronic rich N and unsaturated C atoms. 48 When the reaction pH was above 3.5 (e.g., pH = 3.7 for treatment with initial pH = 9.2), the electrostatic repulsion would hinder the affinity of both 4-CP (pK a = 9.43) and PMS (pK a = 9.40) toward the PCN-0.5 surface, 49,50 resulting in decreased generation of surface PCN−PMS active complexes (as demonstrated below) and passivated degradation of 4-CP.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

2D N-Doped Porous Carbon Derived from Polydopamine-Coated Graphitic Carbon Nitride for Efficient Nonradical Activation of Peroxymonosulfate

Miao

Wang

Alvarez

et al. 2020

Environ. Sci. Technol.

376

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Nitrogen-doped carbon materials attract broad interest as catalysts for peroxymonosulfate (PMS) activation toward an efficient, nonradical advanced oxidation process. However, synthesis of N-rich carbocatalysts is challenging because of the thermal instability of desirable nitrogenous species (pyrrolic, pyridinic, and graphitic N). Furthermore, the relative importance of different nitrogenous configurations (and associated activation mechanisms) are unclear. Herein, we report a “coating-pyrolysis” method to synthesize porous 2D N-rich nanocarbon materials (PCN-x) derived from dopamine and g-C3N4 in different weight proportions. PCN-0.5 calcined at 800 °C had the highest surface area (759 m2/g) and unprecedentedly high N content (18.5 at%), and displayed the highest efficiency for 4-chlorophenol (4-CP) degradation via PMS activation. A positive correlation was observed between 4-CP oxidation rates and the total pyridinic and pyrrolic N content. These N dopants serve as Lewis basic sites to facilitate 4-CP adsorption on the PCN surface and subsequent electron-transfer from 4-CP to PMS, mediated by surface-bound complexes (PMS–PCN-0.5). The main degradation products were chlorinated oligomers (mostly dimeric biphenolic compounds), which adsorbed to and deteriorated the carbocatalyst. Overall, this study offers new insights for rational design of nitrogen-enriched carbocatalysts, and advances mechanistic understanding of the critical role of N species during nonradical PMS activation.

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Section: ■ Results and Discussionmentioning

confidence: 99%

2D N-Doped Porous Carbon Derived from Polydopamine-Coated Graphitic Carbon Nitride for Efficient Nonradical Activation of Peroxymonosulfate

Miao

Wang

Alvarez

et al. 2020

Environ. Sci. Technol.

376

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show abstract

“…Under this condition, the electron transfer reaction can be facilitated and results in high reaction rates. It is known that pH zpc of Mn oxide ranges from 2.4 to 3.4 (Ko et al 2007). Thus, lowering the solution pH near its pH zpc created a plenty of neutral surface sites, [>Mn IV OH], that favored interaction with EE2.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Removal of 17α-Ethinylestradiol by Biogenic Manganese Oxides Produced by the Pseudomonas putida strain MnB1

Kim

Jiang

Jeong

et al. 2011

Water Air Soil Pollut

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Synthetic and persistent endocrine disrupting chemicals (EDCs) such as 17α-ethinylestradiol (EE2) have been frequently detected in the effluent of wastewater treatment plants and induce hazards to humans and wildlife. In this study, biogenic Mn oxides were tested for the removal of EE2, and factors affecting the reaction were also investigated. The biogenic Mn oxides produced by Pseudomonas putida strain MnB1 were nano-sized and poorly crystallized particles. A concentration of 7.9 mg l −1 biogenic Mn oxides showed 87% EE2 (1 mg l −1 ) removal efficiency in 2 h, which confirms the excellent potential of biogenic Mn oxides for removal of estrogens. EE2 removal was enhanced at high Mn oxide doses and at low pH. Co-existing heavy metals significantly inhibit EE2 removal, due to their competition for the reactive sites of biogenic Mn oxides. Humic acid (HA) also obstructed EE2 removal, but the adverse effect was alleviated as HA concentration increased, possibly due to the formation of soluble complexes with the released Mn 2+ , of which adsorption onto Mn oxides reduces surface reactive sites.

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Study on supercritical water oxidation of o-dichlorobenzene in a quartz micro-reactor with in situ microscope and Raman spectroscopy

et al. 2019

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Effects of oxidative coupling reaction of 4-chlorophenol with manganese oxide on the phenanthrene sorption

Cited by 3 publications

References 23 publications

2D N-Doped Porous Carbon Derived from Polydopamine-Coated Graphitic Carbon Nitride for Efficient Nonradical Activation of Peroxymonosulfate

2D N-Doped Porous Carbon Derived from Polydopamine-Coated Graphitic Carbon Nitride for Efficient Nonradical Activation of Peroxymonosulfate

Removal of 17α-Ethinylestradiol by Biogenic Manganese Oxides Produced by the Pseudomonas putida strain MnB1

Study on supercritical water oxidation of o-dichlorobenzene in a quartz micro-reactor with in situ microscope and Raman spectroscopy

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