Synthesis of Cu2O–CuFe2O4 microparticles from Fenton sludge and its application in the Fenton process: the key role of Cu2O in the catalytic degradation of phenol

Faheem, Muhammad; Jiang, Xinbai; Wang, Lianjun; Shen, Jinyou

doi:10.1039/c7ra13608k

Cited by 75 publications

(32 citation statements)

References 45 publications

(55 reference statements)

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“…CFNS has the highest catalytic activity due to the presence of cuprite together with cubic copper ferrite. Cu + is known to be a good catalyst to decompose H 2 O 2 into hydroxyl radicals [6,7], and a synergistic effect between Cu and Fe species was recently observed in Cu-Fe bimetallic catalysts [3]. This is because Cu + produces a major increase in the rate constant for the reduction of Fe 3+ to Fe 2+ (Equation (5)), thereby enhancing the generation of hydroxyl radicals and the phenol degradation efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…Then Cu 2+ ions are reduced by hydrogen peroxide [5,6,7] according to Equation (4). Cu 2+ + H 2 O 2 → Cu + + H + + HO 2 • …”

Section: Introductionmentioning

confidence: 99%

“…The reaction rate constants of Equations (3) and (4) are 1.0 × 10 4 and 4.6 × 10 2 M −1 s −1 , respectively [7], higher than those observed for Fe ions in Equations (1) and (2). Importantly, however, Fe and Cu ions may interact in bimetallic catalysts and in some copper ferrite catalysts, thus increasing their activity.…”

Section: Introductionmentioning

confidence: 99%

“…Importantly, however, Fe and Cu ions may interact in bimetallic catalysts and in some copper ferrite catalysts, thus increasing their activity. This interaction has been attributed to a synergic effect between Cu + /Cu 2+ and Fe 2+ /Fe 3+ redox pairs [3,7], which can be expressed by the reaction given in Equation (5) Fe 3+ + Cu + → Fe 2+ + Cu 2+ …”

Section: Introductionmentioning

confidence: 99%

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Removal of Phenolic Compounds from Water Using Copper Ferrite Nanosphere Composites as Fenton Catalysts

et al. 2019

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Copper ferrites containing Cu+ ions can be highly active heterogeneous Fenton catalysts due to synergic effects between Fe and Cu ions. Therefore, a method of copper ferrite nanosphere (CFNS) synthesis was selected that also permits the formation of cuprite, obtaining a CFNS composite that was subsequently calcined up to 400 °C. Composites were tested as Fenton catalysts in the mineralization of phenol (PHE), p-nitrophenol (PNP) and p-aminophenol (PAP). Catalysts were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and magnetic measurements. Degradation of all phenols was practically complete at 95% total organic carbon (TOC) removal. Catalytic activity increased in the order PHE < PNP < PAP and decreased when the calcination temperature was raised; this order depended on the electronic effects of the substituents of phenols. The as-prepared CFNS showed the highest catalytic activity due to the presence of cubic copper ferrite and cuprite. The Cu+ surface concentration decreased after calcination at 200 °C, diminishing the catalytic activity. Cuprite alone showed a lower activity than the CFNS composite and the homogeneous Fenton reaction had almost no influence on its overall activity. CFNS activity decreased with its reutilization due to the disappearance of the cuprite phase. Degradation pathways are proposed for the phenols.

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Section: Resultsmentioning

confidence: 99%

“…Then Cu 2+ ions are reduced by hydrogen peroxide [5,6,7] according to Equation (4). Cu 2+ + H 2 O 2 → Cu + + H + + HO 2 • …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Phenolic Compounds from Water Using Copper Ferrite Nanosphere Composites as Fenton Catalysts

et al. 2019

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“…This will result in a good desorption of NO 2 on the surface of the sludge, eventually releasing the active sites used to adsorb NO. This promotes the continuous adsorption of NO on the surface of the sludge, so that the reaction continues, and the denitration rate is significantly improved [17,18,19]. …”

Section: Introductionmentioning

confidence: 99%

Application of Plasma Treatment in Preparation of Soybean Oil Factory Sludge Catalyst and Its Application in Selective Catalytic Oxidation (SCO) Denitration

Zhang

Yang

et al. 2018

Materials

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At present, the most commonly used denitration process is the selective catalytic reduction (SCR) method. However, in the SCR method, the service life of the catalyst is short, and the industrial operation cost is high. The selective catalytic oxidation absorption (SCO) method can be used in a low temperature environment, which greatly reduces energy consumption and cost. The C/N ratio of the sludge produced in the wastewater treatment process of the soybean oil plant used in this paper is 9.64, while the C/N ratio of the sludge produced by an urban sewage treatment plant is 10–20. This study shows that the smaller the C/N ratio, the better the denitration efficiency of the catalyst. Therefore, dried oil sludge is used as a catalyst carrier. The influence of different activation times, and LiOH concentrations, on catalyst activity were investigated in this paper. The denitration performance of catalysts prepared by different activation sequences was compared. The catalyst was characterized by Fourier Transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). The experimental results showed that: (1) When the concentration of the LiOH solution used for activation is 15%, and the activation time is four hours, the denitration effect of the catalyst is the best; (2) the catalyst prepared by activation before plasma roasting has the best catalytic activity.

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Waste Valorization: Physical, Chemical, and Biological Routes

Faheem¹,

Hassan²,

Mehmood³

et al. 2021

Sustainable Solutions for Environmental Pollution

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Synthesis of Cu₂O–CuFe₂O₄ microparticles from Fenton sludge and its application in the Fenton process: the key role of Cu₂O in the catalytic degradation of phenol

Abstract: The higher catalytic activity of Cu2O–CuFe2O4 could be attributed to the availability of both Cu(i) and Cu(ii) as well as Fe(ii)/Fe(iii).

Cited by 75 publications

References 45 publications

Removal of Phenolic Compounds from Water Using Copper Ferrite Nanosphere Composites as Fenton Catalysts

Removal of Phenolic Compounds from Water Using Copper Ferrite Nanosphere Composites as Fenton Catalysts

Application of Plasma Treatment in Preparation of Soybean Oil Factory Sludge Catalyst and Its Application in Selective Catalytic Oxidation (SCO) Denitration

Waste Valorization: Physical, Chemical, and Biological Routes

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