Adsorption-depended Fenton-like reaction kinetics in CeO2-H2O2 system for salicylic acid degradation

Zang, Chengjie; Yu, Kaifeng; Hu, Shiyu; Chen, Feng

doi:10.1016/j.colsurfa.2018.05.100

Cited by 27 publications

(11 citation statements)

References 33 publications

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“…The practical exchanged amount of Cu 2 + in Cu-Bir catalysts is shown in Figure 1a, which can be fitted with the Langmuir isotherm adsorption equation (Figure S1). [13] The as-simulated maximum adsorption amount of Cu 2 + (Q m = 75.3 mg • g À 1 ) fits well with the actual measured value (75 mg • g À 1 ). Therefore, Cu 2 + adsorption on the Bir surface is considered to be chemical adsorption, and the adsorption of Cu 2 + has reached saturation when the initial concentration of Cu 2 + in the solution reaches 5.0 mM.…”

Section: Physical Chemical Structure Of Catalystssupporting

confidence: 71%

“…As the concentration of Cu 2+ for ion‐exchange increases from 0.5 mM to 10.0 mM, the ratio of Cu/Mn in Cu‐Birs increases from 0.026 to 0.137, and the ratio of (Na, K)/Mn decreases from 0.303 to 0.018, accordingly. The practical exchanged amount of Cu 2+ in Cu‐Bir catalysts is shown in Figure 1a, which can be fitted with the Langmuir isotherm adsorption equation (Figure S1) [13] . The as‐simulated maximum adsorption amount of Cu 2+ (Q m =75.3 mg ⋅ g −1 ) fits well with the actual measured value (75 mg ⋅ g −1 ).…”

Section: Resultssupporting

confidence: 52%

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Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Guo

Gao

et al. 2023

Chemistry An Asian Journal

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The peroxymonosulfate (PMS) activation mechanism is closely related to the structure/configuration of the "active site" of the Fenton-like catalysts. In this paper, it is shown that Cu 2 + chemically bonds the surface of birnessite at the Mn vacancy site to form triple-corner-sharing innersphere surface complexes (Cu-Bir), which regulates the PMS activation mechanism. Birnessite/PMS Fenton-like system degrades phenol via a non-radical mechanism, which involves high valent Mn(V) = O generated from the surface reaction of Mn(III) with adsorbed PMS. While Cu-Bir initiates an additional radical mechanism that involves reactive oxygen species of •O 2 À and 1 O 2 , and the k value of 5Cu-Bir is 1.9 times higher than that of Bir. The Fenton-like reaction mechanism of the Cu-Bir/PMS system is thus proposed as a radical and non-radical cooccurrence mechanism, which involves a synergistic effect that the radical pathway accelerates the regeneration of Mn(III) for the non-radical pathway, and the non-radical pathway assists to produce 1 O 2 for the radical pathway.

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Section: Physical Chemical Structure Of Catalystssupporting

confidence: 71%

Section: Resultssupporting

confidence: 52%

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Guo

Gao

et al. 2023

Chemistry An Asian Journal

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“…Furthermore, CeO 2 is considered to be an effective thermocatalyst in the presence of a precious metal, which can effectively remove volatile organic compounds, mainly due to its reducibility . On the other hand, CeO 2 has the ability to activate H 2 O 2 similar to a iron-based catalyst and can decompose it into • OH. , Other studies have shown that the formation of a ceria–zirconia solid solution by doping Zr into the CeO 2 lattice would enhance the redox properties and oxygen mobility . Hence, in this work, we fabricated an Fe-doped Ce 0.75 Zr 0.25 O 2 solid solution (Fe-Ce 0.75 Zr 0.25 O 2 )/CF composite cathode for a heterogeneous EF process and the performance of Fe-Ce 0.75 Zr 0.25 O 2 /CF for the degradation of PAM was detailedly investigated.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Xie

Liu

et al. 2019

ACS Appl. Mater. Interfaces

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Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, corrosion resistance, high viscosity, and nonabsorption by soil. The composite of Fe-doped Ce0.75Zr0.25O2 solid solution (Fe-Ce0.75Zr0.25O2) loaded on carbon felt (CF) was fabricated by a hydrothermal synthesis method, which was used as the cathode in a heterogeneous electro-Fenton system for the degradation of PAM. It showed that the degradation efficiency of PAM by the Fe-Ce0.75Zr0.25O2/CF cathode was 86% after 120 min and the molecular mass of PAM decreased by more than 90% after 300 min. Total organic carbon removal reached 78.86% in the presence of Fe-Ce0.75Zr0.25O2/CF, while the value was only 38.01% in the absence of Fe-Ce0.75Zr0.25O2. Further studies showed that the breaking of the chain begins with the amide bond, and then, the carbon chain was cracked into a short alkyl chain. As degradation progressed, both the complex viscosity and elasticity modulus of PAM solutions decreased nearly 50% at 300 min. It indicated that •OH were the most significant active species for the degradation of PAM. This novel Fe-Ce0.75Zr0.25O2/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.

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“…As reported, the Fenton-like reaction with CeO 2 involves the formation of peroxide species on the surface of ceria due to the complexation of H 2 O 2 with Ce 3+ sites [25,30,58]. These peroxide species are chemically stable and can saturate the surface of CeO 2 , hindering the adsorption and subsequent oxidation of the organic target contaminant [25,30,58].…”

Section: (Photo)catalytic Activitymentioning

confidence: 86%

“…The Fenton-like process through ceria is activated by the presence of non-stoichiometric Ce 3+ centres on the surface of CeO 2 (reaction 6, [30,31]). One of the simpler methods to induce these defects is the exposure of CeO 2 to sunlight [32].…”

Section: Introductionmentioning

confidence: 99%

CeO2 for Water Remediation: Comparison of Various Advanced Oxidation Processes

et al. 2020

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Three different Advanced Oxidation Processes (AOPs) have been investigated for the degradation of the imidacloprid pesticide in water: photocatalysis, Fenton and photo-Fenton reactions. For these tests, we have compared the performance of two types of CeO2, employed as a non-conventional photocatalyst/Fenton-like material. The first one has been prepared by chemical precipitation with KOH, while the second one has been obtained by exposing the as-synthetized CeO2 to solar irradiation in H2 stream. This latter treatment led to obtain a more defective CeO2 (coded as “grey CeO2”) with the formation of Ce3+ sites on the surface of CeO2, as determined by Raman and X-ray Photoelectron Spectroscopy (XPS) characterizations. This peculiar feature has been demonstrated as beneficial for the solar photo–Fenton reaction, with the best performance exhibited by the grey CeO2. On the contrary, the bare CeO2 showed a photocatalytic activity higher with respect to the grey CeO2, due to the higher exposed surface area and the lower band-gap. The easy synthetic procedures of CeO2 reported here, allows to tune and modify the physico-chemical properties of CeO2, allowing a choice of different CeO2 samples on the basis of the specific AOPs for water remediation. Furthermore, neither of the samples have shown any critical toxicity.

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Adsorption-depended Fenton-like reaction kinetics in CeO2-H2O2 system for salicylic acid degradation

Cited by 27 publications

References 33 publications

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

CeO2 for Water Remediation: Comparison of Various Advanced Oxidation Processes

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Adsorption-depended Fenton-like reaction kinetics in CeO2-H2O2 system for salicylic acid degradation

Cited by 27 publications

References 33 publications

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu2+ Modified Birnessite

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu2+ Modified Birnessite

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce0.75Zr0.25O2 Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

CeO2 for Water Remediation: Comparison of Various Advanced Oxidation Processes

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Product

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Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Activation Mechanism of a Peroxymonosulfate‐based Fenton‐like System with Birnessite and Cu²⁺ Modified Birnessite

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process