Degradation and mineralization of phenol in aqueous medium by heterogeneous monopersulfate activation on nanostructured cobalt based-perovskite catalysts ACoO 3 (A = La, Ba, Sr and Ce): Characterization, kinetics and mechanism study

Hammouda, Samia Ben; Zhao, Feiping; Safaei, Zahra; Srivastava, Varsha; Ramasamy, Deepika Lakshmi; Iftekhar, Sidra; Kalliola, Simo; Sillanpää, Mika

doi:10.1016/j.apcatb.2017.05.051

Cited by 196 publications

(55 citation statements)

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“…Recently, advanced oxidation processes (AOPs) based on sulfate radical (SO 4 • − ) generated from peroxymonosulfate (PMS) and peroxydisulfate (PDS) have attracted much attention for the oxidation of water and soil contaminations. Sulfate radical has a higher oxidative potential (E 0 = 2.5~3.1 V versus E 0 = 2.7 V of hydroxyl radical), a longer lifetime (t 1/2 = 30~40 µs of SO 4 • − versus t 1/2 ≤ 1µs of hydroxyl radical [1]), and a better flexibility of pH tolerance [2][3][4], which could be a promising alternative to the traditional hydroxyl radical. Analogous to hydroxyl radical, sulfate radicals could be obtained by activating persulfate through various homogeneous and heterogeneous activation processes.…”

Section: Introductionmentioning

confidence: 99%

“…It was postulated that the sp 2 covalent carbon network, oxygen-containing functional groups, and the defective edges conducted a redox cycle for electron transfer to persulphate to form radicals [14,20]. Thus, carbon materials could donate an electron to PMS or PDS to form the reactive radicals [21] (Equations (3) and (4)). Furthermore, SO 4 • − in aqueous solution could react with H 2 O or OH − to produce •OH (Equations (5) and (6)) [22].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Lan

2019

Catalysts

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A classic carbon material—expanded graphite (EG), was prepared and proposed for a new application as catalysts for activating peroxydisulfate (PDS). EG samples prepared at different expansion temperatures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. It was observed that there existed a remarkable synergistic effect in the EG/PDS combined system to degrade Acid Red 97 (AR97). Unlike other carbon material catalysts, sp2 carbon structure may be the main active site in the catalytic reaction. The EG sample treated at 600 °C demonstrated the best catalytic activity for the activation of PDS. Degradation efficiency of AR97 increased with raising PDS dosage and EG loadings. The pH of aqueous solution played an important role in degradation and adsorption, and near-neutrality was the optimal pH in this research. It was assumed that the radical pathway played a dominant role in AR97 degradation and that oxidation of AR97 occurred in the pores and interface layer on the external surface of EG by SO4·− and ·OH, generated on or near the surface of EG. The radical oxidation mechanism was further confirmed by electron paramagnetic resonance spectroscopy. The EG sample could be regenerated by annealing, and the catalytic ability was almost fully recovered.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Lan

2019

Catalysts

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“…The presence of acidic byproducts during oxidation reactions and the higher basic strength being difficult to change at pH 11.0 might lead to these pH variations. It was reported that sulfate radicals (SO 4 −• ) were easily scavenged by hydroxyl ions and transferred to hydroxyl radicals ( • OH), which exhibited weaker oxidation potential and shorter lifetime than SO 4 −• . Therefore the removal rate of AO7 was comparatively slow at higher pH.…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that sulfate radicals (SO 4 −• ) were easily scavenged by hydroxyl ions and transferred to hydroxyl radicals ( • OH), which exhibited weaker oxidation potential and shorter lifetime than SO 4 −• . 62 Therefore the removal rate of AO7 was comparatively slow at higher pH.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

Liu

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND A novel carbon‐based modified MnFe2O4 catalyst was first developed to produce sulfate radicals (SO4−•) by activation of persulfate (PS). The catalyst was fabricated with a mixture of MnFe2O4 nanoparticles and chitosan (which could form a large amount of carbon‐based biomass after pyrolysis) annealed at 600 °C and was referred to as CM‐600. RESULTS The microstructure of the composite catalyst CM‐600 showed that MnFe2O4 was supported on the surface of carbon‐based sheets. After modification by pyrolysis, the specific surface area of MnFe2O4 enlarged significantly and thus the contact area between catalyst and PS increased. X‐ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy and X‐ray photoelectron spectroscopy were used to characterize the components of CM‐600. In comparison with the MnFe2O4/PS system, the activation of PS by CM‐600 was enhanced prominently, while 99.0% Acid Orange 7 (AO7) removal was achieved after reacting for 30 min. Investigations of influencing factors indicated the optimal treatment parameters. The two reactive species in the degradation process, namely free radicals (SO4−• and hydroxyl radicals (•OH)) and non‐radicals (singlet oxygen, 1O2), were confirmed by quenching tests and electron spin resonance spectroscopy. The corresponding degradation mechanism was proposed and SO4−• was generated primarily via the activation of PS by MnII and FeII. CONCLUSION The research demonstrated that the composite catalyst CM‐600 improved the property of MnFe2O4 for catalyzing PS and thus enlarged the practical application of SO4−• oxidation technology in pollutant degradation in aqueous environments. © 2019 Society of Chemical Industry

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“…Our ICP-MS analysis showed that the leaching concentration (percentage) of Co 2+ and Mn 2+ aer the rst run was 1.669 and 0.467 mg L À1 , respectively. The reported Co leaching concentration was 0.662 mg L À1 for CoFe 2 O 4 /TiO 2 , 9 0.928 mg L À1 for CoFe 2 O 4 , 9 1.167 mg L À1 for SrCoO 3 , 29 2.45 mg L À1 for CoFe 2 O 4 /SBA-15, 19 ca. 9.0 mg L À1 for Co-BTC 46 and 9.8 mg L À1 for PrBaCo 2 O 5+d .…”

Section: àmentioning

confidence: 98%

Catalytic activation of peroxymonosulfate with manganese cobaltite nanoparticles for the degradation of organic dyes

et al. 2020

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In this work, we report the facile hydrothermal synthesis of manganese cobaltite nanoparticles (MnCo 2 O 4.5 NPs) which can efficiently activate peroxymonosulfate (PMS) for the generation of sulfate free radicals (SO 4 c À ) and degradation of organic dyes. The synthesized MnCo 2 O 4.5 NPs have a polyhedral morphology with cubic spinel structure, homogeneously distributed Mn, Co, and O elements, and an average size less than 50 nm. As demonstrated, MnCo 2 O 4.5 NPs showed the highest catalytic activity among all tested catalysts (MnO 2 , CoO) and outperformed other spinel-based catalysts for Methylene Blue (MB) degradation. The MB degradation efficiency reached 100% after 25 min of reaction under initial conditions of 500 mg L À1 Oxone, 20 mg L À1 MnCo 2 O 4.5 , 20 mg L À1 MB, unadjusted pH, and T ¼ 25 C.MnCo 2 O 4.5 NPs showed a great catalytic activity in a wide pH range (3.5-11), catalyst dose (10-60 mg L À1 ), Oxone concentration (300-1500 mg L À1 ), MB concentration (5-40 mg L À1 ), and temperature (25-55 C). HCO 3 À , CO 3 2À and particularly Cl À coexisting anions were found to inhibit the catalytic activity of MnCo 2 O 4.5 NPs. Radical quenching experiments revealed that sulfate radicals are primarily responsible for MB degradation. A reaction sequence for the catalytic activation of PMS was proposed. The asprepared MnCo 2 O 4.5 NPs could be reused for at least three consecutive cycles with small deterioration in their performance due to low metal leaching. This study suggests a facile route for synthesizing MnCo 2 O 4.5 NPs with high catalytic activity for PMS activation and efficient degradation of organic dyes. † Electronic supplementary information (ESI) available: Inuence of reaction sequence and NO 3 À concentration on MB degradation, the proposed reactions of coexisting anions with free radicals, and some physicochemical properties of H 2 O 2 , PS and PMS. See The as-synthesized MnCo 2 O 4.5 sample was characterized by Xray diffraction (XRD; Siemens D5005 X-ray diffractometer; Cu-Ka radiation, l ¼ 1.5418Å; voltage/current 30 kV/40 mA; scan rate 0.9 /min; scan step 0.03 ; 2q from 10 to 70 ), scanning electron microscopy (SEM; Hitachi S4800 eld-emission scanning electron microscope), scanning TEM (STEM; JEOL JEM-ARM200F microscope; high-angle annular dark-eld (HAADF) detector; voltage 200 kV; spherical aberration corrector; nominal resolution 0.8Å), X-ray photoelectron spectroscopy (XPS; Shimadzu Kratos AXIS-ULTRA DLD; monochromated Al Ka radiation). The average crystallite size of MnCo 2 O 4.5 particles was calculated using Scherrer equation: 16where l is the wavelength of Cu Ka irradiation, l ¼ 1.5418Å, b is the full width at maximal half (FWHM), q is Bragg diffraction angle (peak position), and k ¼ 0.9. Catalysis studiesThe catalytic activity of MnCo 2 O 4.5 NPs for PMS activation was evaluated through the degradation of organic dyes in batch 3776 | RSC Adv., 2020, 10, 3775-3788This journal is Fig. 11 COD removal efficiency of MnCo 2 O 4.5 /PMS system for different sources of contaminant.378...

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Degradation and mineralization of phenol in aqueous medium by heterogeneous monopersulfate activation on nanostructured cobalt based-perovskite catalysts ACoO 3 (A = La, Ba, Sr and Ce): Characterization, kinetics and mechanism study

Cited by 196 publications

References 77 publications

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

Catalytic activation of peroxymonosulfate with manganese cobaltite nanoparticles for the degradation of organic dyes

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Degradation and mineralization of phenol in aqueous medium by heterogeneous monopersulfate activation on nanostructured cobalt based-perovskite catalysts ACoO 3 (A = La, Ba, Sr and Ce): Characterization, kinetics and mechanism study

Cited by 196 publications

References 77 publications

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe2O4 composite catalyst

Catalytic activation of peroxymonosulfate with manganese cobaltite nanoparticles for the degradation of organic dyes

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Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst