Recent advances in Cu-Fenton systems for the treatment of industrial wastewaters: Role of Cu complexes and Cu composites

Li, Jiayi; Pham, A. Ninh; Dai, Ruobin; Wang, Zhiwei; Waite, T. David

doi:10.1016/j.jhazmat.2020.122261

Cited by 152 publications

(26 citation statements)

References 199 publications

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“…These observations imply that advanced oxidative processes (AOPs) [ 22 ], which is worked by the in situ generated active hydroxyl radical ( • OH) as oxidizing agent to oxidatively degrade dyes, have been applied to the degradation of AO7 dye and there might be multiple pathways to dominate the AOPs. In general, the water-insoluble Cu(II) complexes can react with H 2 O 2 to produce • OH radicals via homolytic cleavage or • OH and HO 2 • radicals via Cu redox cycles for degrading AO7 dye both in dark and under daylight [ 66 , 67 , 68 ]. However, daylight irradiation might result in Cu-based Fenton processes that would cause the generation of photoexcited holes (h + ) and electrons (e − ) [ 66 , 67 , 68 ].…”

Section: Resultsmentioning

confidence: 99%

“…In general, the water-insoluble Cu(II) complexes can react with H 2 O 2 to produce • OH radicals via homolytic cleavage or • OH and HO 2 • radicals via Cu redox cycles for degrading AO7 dye both in dark and under daylight [ 66 , 67 , 68 ]. However, daylight irradiation might result in Cu-based Fenton processes that would cause the generation of photoexcited holes (h + ) and electrons (e − ) [ 66 , 67 , 68 ]. The former might react with OH − to produce • OH whereas the latter might react with H 2 O 2 to produce • OH or O 2 to form O 2 • − for oxidative degradation of AO7 dye.…”

Section: Resultsmentioning

confidence: 99%

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Anion-Dominated Copper Salicyaldimine Complexes—Structures, Coordination Mode of Nitrate and Decolorization Properties toward Acid Orange 7 Dye

Tsai,

Lin

et al. 2020

Polymers

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A salicyaldimine ligand, 3-tert-butyl-4-hydroxy-5-(((pyridin-2-ylmethyl)imino)methyl)benzoic acid (H2Lsalpyca) and two Cu(II)−salicylaldimine complexes, [Cu(HLsalpyca)Cl] (1) and [Cu(HLsalpyca)(NO3)]n (2), have been synthesized. Complex 1 has a discrete mononuclear structure, in which the Cu(II) center is in a distorted square-planar geometry made up of one HLsalpyca− monoanion in an NNO tris-chelating mode and one Cl− anion. Complex 2 adopts a neutral one-dimensional zigzag chain structure propagating along the crystallographic [010] direction, where the Cu(II) center suits a distorted square pyramidal geometry with a τ value of 0.134, consisted of one HLsalpyca− monoanion as an NNO tris-chelator and two NO3− anions. When the Cu∙∙∙O semi coordination is taken into consideration, the nitrato ligand bridges two Cu(II) centers in an unsymmetrical bridging-tridentate with a μ, κ4O,O′:O′,O″ coordination. Clearly, anion herein plays a critical role in dominating the formation of discrete and polymeric structures of copper salicyaldimine complexes. Noteworthy, complex 2 is insoluble but highly stable in H2O and various organic solvents (CH3OH, CH3CN, acetone, CH2Cl2 and THF). Moreover, complex 2 shows good photocatalytic degradation activity and recyclability to accelerate the decolorization rate and enhance the decolorization performance of acid orange 7 (AO7) dye by hydrogen peroxide (H2O2) under daylight.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Anion-Dominated Copper Salicyaldimine Complexes—Structures, Coordination Mode of Nitrate and Decolorization Properties toward Acid Orange 7 Dye

Tsai,

Lin

et al. 2020

Polymers

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“…Advanced Oxidation Processes (AOPs) is an effective approach to decontaminate high-concentration nitrogenous organic wastewaters. The Fenton/Fenton-like wastewater treatment has been reviewed on ferrous and non-ferrous heterogeneous Fenton processes (Thomas et al 2021) and Cubased heterogeneous and homogenous Fenton-like processes (Li et al 2020a). The Cu-Fe spinel ferrites (e.g., CuFe 2 O 4 ) was found with superior performance over the mono-metal oxides in Fenton applications (Albuquerque et al 2012;Sharma et al 2015;Dang and Le 2016).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

Zhou

Chen

et al. 2022

Appl Water Sci

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Membrane Fenton-like process with cobalt–copper spinel catalyst is proposed to degrade nitrogenous organic hazardous in wastewater. Cu-auxiliary cobalt oxide (CuxCo3–xO4) was synthesized with the dispersion co-precipitation method. As-prepared CuCo2O4 performed as the best catalyst for Fenton degradation on nitrogen-containing organic compound as methylene blue (C16H18N3ClS) in water and N,N-dimethylacetamide [CH3CON(CH3)2] in industrial wastewater. Lattice substation of Cu2+ to Co2+ ion increased the oxygen vacancies and catalytic activity. The catalyst stability was improved owing to hybrid polarization confinement (total metal elution less than 0.8 mg/L). Methylene blue in water (C0 = 100 mg/L) was completely decolorized in 50 min using 0.6 g/L CuCo2O4 and 0.09 M H2O2 at intrinsic pH 6.7. Degradation reaction rate constant was increased by two folds as k = 0.076 min−1 catalyzed by CuCo2O4 over k = 0.039 min−1 by Co3O4. DMAc-contaminant wastewater of high CODs 19,080 mg/L was treated using 2.4 g/L CuCo2O4 and 2.4 M H2O2 at intrinsic pH = 7.6. Removal rate of DMAc was enhanced from 81 to 99% in the ceramic membrane reactor when H2O2 was activated, and self-sweeping effect was suppressed. As a result, Total Organic Nitrogen (2900 mg/L) in the wastewater was mineralized by 99.9% with a fast transformation to inorganic NO3− ion. Biodegradability of the resistant organic wastewater was remarkably improved, and BOD/COD was increased by 18 folds.

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“…Graphitic carbon nitride (g-C 3 N 4 ) is another famous 2D carbon material, which has similar structure with graphene. g-C 3 N 4 materials were mainly used as photocatalysts (Li et al 2020a(Li et al , 2020b, and also used as catalyst supports, including as heterogeneous Fenton catalyst supports (Ding et al 2019;Wang & Nan 2020). Recently, we reported the performance of g-C 3 N 4 as a heterogeneous Fenton catalyst for the first time (Zhu et al 2020a(Zhu et al , 2020b.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Synergistically homogeneous-heterogeneous Fenton catalysis of trace copper ion and g-C3N4 for degradation of organic pollutants

Yao

Zhu

et al. 2021

Water Science and Technology

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Using the bulk g-C3N4 as a precursor, four g-C3N4 nanosheets were further prepared by ultrasonic, thermal, acid, and alkali exfoliation. The structures of these materials were characterized by various techniques such as X-ray powder diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-Ray spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The synergistical Fenton catalysis of these materials with Cu2+ was evaluated by using rhodamine B as a simulated organic pollutant. The results showed that there existed a significant synergistical Fenton catalysis between Cu2+ and g-C3N4. This synergistic effect can be observed even when the concentration of Cu2+ was as low as 0.064 mg L−1. The properties of g-C3N4 strongly influenced the catalytic activity of the Cu2+/g-C3N4 system. The coexistent of Cu2+ and the alkali exfoliated g-C3N4 showed the most excellent catalytic activity. Hydroxyl radicals as oxidizing species were confirmed in the Cu2+/g-C3N4 system by electron paramagnetic resonance spectrum. The synergistic catalysis may be attributed to the easier reduction of Cu2+ adsorbed on the g-C3N4. This study provided an excellent Fenton catalytic system, and partly solved the rapid deactivation of heterogeneous Fenton catalysts caused by the leaching of metal ions. HIGHTLIGHTS There exists a significant synergistical Fenton catalysis between trace Cu2+ and g-C3N4. The Cu2+ concentration is lower than the maximum acceptable limit in drinking water. This study partly solved the rapid deactivation caused by the leaching of metal ions. This study reminds researchers to pay attention to the possible synergistic catalysis between leached ions and supports.

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Recent advances in Cu-Fenton systems for the treatment of industrial wastewaters: Role of Cu complexes and Cu composites

Cited by 152 publications

References 199 publications

Anion-Dominated Copper Salicyaldimine Complexes—Structures, Coordination Mode of Nitrate and Decolorization Properties toward Acid Orange 7 Dye

Anion-Dominated Copper Salicyaldimine Complexes—Structures, Coordination Mode of Nitrate and Decolorization Properties toward Acid Orange 7 Dye

Synthesis of CuxCo3−xO4 nanocatalyst for degradation of nitrogenous organic wastewater in Fenton-like membrane reactor

Synergistically homogeneous-heterogeneous Fenton catalysis of trace copper ion and g-C3N4 for degradation of organic pollutants

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