Hydroxyl radical generation by zero-valent iron/Cu (ZVI/Cu) bimetallic catalyst in wastewater treatment: Heterogeneous Fenton/Fenton-like reactions by Fenton reagents formed in-situ under oxic conditions

Yamaguchi, Rina; Kurosu, Shunji; Suzuki, Moe; Kawase, Y.

doi:10.1016/j.cej.2017.10.154

Cited by 220 publications

(63 citation statements)

References 51 publications

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“…The S BET decreased from 111.48 m 2 g -1 (biochar) to 59.34 m 2 g -1 (nZVI/BC) and 26.7 m 2 g -1 (Cu-nZVI/BC) ( Table 1). Previous studies have also shown that the surface area decrease is due to the presence of iron oxides [2] and copper oxides [24], which decrease the surface areas of Cu-nZVI/BC. As shown in the TEM images (Figs.…”

Section: Characterization Of Nanoparticlesmentioning

confidence: 91%

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

Desalination and Water Treatment

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Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g-1) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second-order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.

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Section: Characterization Of Nanoparticlesmentioning

confidence: 91%

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

Desalination and Water Treatment

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“…As a typical AOP, Fenton reaction is efficient for HO• production, but still faces some limitations, such as the strict acidic pH range (pH < 4) [12,13], formation of iron sludge [14,15], and high cost for catalyst recycling [16,17]. A number of non-ferrous metals, such as copper [18], manganese [19], and titanium [20], have been developed as alternatives. In particular, Cu + reacts with H 2 O 2 in a similar manner to Fe 2+ , but with a much higher reaction rate constant (as shown in Equations (1) and (2)).…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

et al. 2020

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The classic Fenton reaction, which is driven by iron species, has been widely explored for pollutant degradation, but is strictly limited to acidic conditions. In this work, a copper-based Fenton-like catalyst Cu/Al2O3/g-C3N4 was proposed that achieves high degradation efficiencies for Rhodamine B (Rh B) in a wide range of pH 4.9–11.0. The Cu/Al2O3 composite was first prepared via a hydrothermal method followed by a calcination process. The obtained Cu/Al2O3 composite was subsequently stabilized on graphitic carbon nitride (g-C3N4) by the formation of C−O−Cu bonds. The obtained composites were characterized through FT-IR, XRD, TEM, XPS, and N2 adsorption/desorption isotherms, and the immobilized Cu+ was proven to be active sites. The effects of Cu content, g-C3N4 content, H2O2 concentration, and pH on Rh B degradation were systematically investigated. The effect of the catalyst dose was confirmed with a specific reaction rate constant of (5.9 ± 0.07) × 10−9 m·s−1 and the activation energy was calculated to be 71.0 kJ/mol. In 100 min 96.4% of Rh B (initial concentration 20 mg/L, unadjusted pH (4.9)) was removed in the presence of 1 g/L of catalyst and 10 mM of H2O2 at 25 °C, with an observed reaction rate constant of 6.47 × 10−4 s−1. High degradation rates are achieved at neutral and alkaline conditions and a low copper leaching (0.55 mg/L) was observed even after four reaction cycles. Hydroxyl radical (HO·) was identified as the reactive oxygen species by using isopropanol as a radical scavenger and by ESR analysis. HPLC-MS revealed that the degradation of Rh B on Cu/Al2O3/CN composite involves N-de-ethylation, hydroxylation, de-carboxylation, chromophore cleavage, ring opening, and the mineralization process. Based on the results above, a tentative mechanism for the catalytic performance of the Cu/Al2O3/g-C3N4 composite was proposed. In summary, the characteristics of high degradation rate constants, low ion leaching, and the excellent applicability in neutral and alkaline conditions prove the Cu/Al2O3/g-C3N4 composite to be a superior Fenton-like catalyst compared to many conventional ones.

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“…Among various transition metals, copper has exhibited superior catalytic activity in Fenton-like systems, especially under high pH conditions. This behavior triggered the exploration of various copper-containing materials in wastewater treatment, such as zero-valent iron-Cu bimetallic catalyst, 30 Cu/Fe oxides, 31 Fe 3 O 4 @Cu nanocomposite, 32 CuFe/ mesoporous carbon, 33 and CuFe-MCM-41. 34 Incorporating copper into the catalyst could be a feasible way to enhance its activity under high pH conditions.…”

Section: Introductionmentioning

confidence: 99%

Graphitic Carbon Nitride/Copper‐Iron Oxide Composite for Effective Fenton Degradation of Ciprofloxacin at Near‐Neutral pH

Ding

Khan²,

Lam

et al. 2020

ChemistrySelect

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In this work, graphitic carbon nitride/copper‐iron oxide (CN@CIO) composites were prepared via in‐situ thermal condensation of dicyandiamide onto CIO. The activity of the as‐prepared catalyst to degrade ciprofloxacin (CIP) was investigated systematically in the dark Fenton reaction. With the increase in the copper content in the CN@CIO composites, the CIP removal efficiency gradually improved and reached a maximum with CN@CIO4, in which the molar loading ratio of Cu to Fe was 0.242. Additionally, the effects of the experimental conditions on CIP oxidation were studied by altering several key reaction parameters, including the catalyst amount, reaction temperature, and initial concentrations of CIP and H2O2. Under the optimum condition, almost complete degradation was achieved within 1 h. It was demonstrated that CIP oxidation by CN@CIO follows the pseudo second‐order reaction model. Overall, the fabricated CN@CIO composite holds great potential for refractory organic removal and deserves in‐depth investigation.

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Hydroxyl radical generation by zero-valent iron/Cu (ZVI/Cu) bimetallic catalyst in wastewater treatment: Heterogeneous Fenton/Fenton-like reactions by Fenton reagents formed in-situ under oxic conditions

Cited by 220 publications

References 51 publications

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Kinetic and Mechanistic Study of Rhodamine B Degradation by H2O2 and Cu/Al2O3/g-C3N4 Composite

Graphitic Carbon Nitride/Copper‐Iron Oxide Composite for Effective Fenton Degradation of Ciprofloxacin at Near‐Neutral pH

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