Iron-doped cathodes for electro-Fenton implementation: Application for pymetrozine degradation

Fdez-Sanromán, Antía; Acevedo-García, Valeria; Pazos, Marta; Sanromán, M.A.; Rosales, Emílio

doi:10.1016/j.electacta.2020.135768

Cited by 38 publications

(9 citation statements)

References 49 publications

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“…The modification of the carbonaceous-based materials by introducing functional groups by heteroatom doping has been successfully applied over the last few years [123,124]. The functionalized cathodes may act as a heterogeneous catalyst initiating the Fenton reaction with electrogenerated H 2 O 2 operating at lower pH [125].…”

Section: Electro-fentonmentioning

confidence: 99%

Heterogeneous Advanced Oxidation Processes: Current Approaches for Wastewater Treatment

2022

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Nowadays, water pollution is one of the most dangerous environmental problems in the world. The presence of the so-called emerging pollutants in the different water bodies, impossible to eliminate through conventional biological and physical treatments used in wastewater treatment plants due to their persistent and recalcitrant nature, means that pollution continues growing throughout the world. The presence of these emerging pollutants involves serious risks to human and animal health for aquatic and terrestrial organisms. Therefore, in recent years, advanced oxidation processes (AOPs) have been postulated as a viable, innovative and efficient technology for the elimination of these types of compounds from water bodies. The oxidation/reduction reactions triggered in most of these processes require a suitable catalyst. The most recent research focuses on the use and development of different types of heterogeneous catalysts, which are capable of overcoming some of the operational limitations of homogeneous processes such as the generation of metallic sludge, difficult separation of treated water and narrow working pH. This review details the current advances in the field of heterogeneous AOPs, Fenton processes and photocatalysts for the removal of different types of emerging pollutants.

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Section: Electro-fentonmentioning

confidence: 99%

Heterogeneous Advanced Oxidation Processes: Current Approaches for Wastewater Treatment

2022

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“…Continuous-flow experiment is more meaningful for the practical application of the EF process. Different flow rates (3, 4, and 5 mL/min) with different hydraulic retention times (33,25, and 20 min) were carried out for continuous-flow experiments. As shown in Figure 9A,B, once triggering the EF reaction, the pollutant concentration in the outlet water decreased sharply.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Therefore, it is highly desirable to develop such an EF system that the catalyst is fixed to recycle easily and the electrode itself can produce and activate H 2 O 2 at the same time. Recently, multifunctional composite materials have emerged on one cathode for H 2 O 2 production and activation in the EF process, , but the H 2 O 2 generation on the cathode through a two-electron ORRs can be impaired by the coexisting Fe species . A functionalized membrane stack for a sequential flow-through double-cathode EF process was constructed to try to tackle the problem. − However, membrane blocking is the biggest challenge for membrane reactors.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Continuous-Flow Electro-Fenton Treatment of Antibiotic Wastewater Using a Double-Cathode System

Tang

Zhu

Shang

et al. 2021

ACS Sustainable Chem. Eng.

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A simple, efficient, and environmentally friendly electro-Fenton (EF) process is highly demanded for EF practical application. Herein, a highly practical double-cathode EF system has been developed: (1) KOH-activated graphite felt (AGF) for H2O2 production and (2) FeOCl-modified carbon cloth (FeOCl/CC) for H2O2 activation. The H2O2 production at the AGF cathode reaches 3.4 mmol/L in 60 min (pH 3, −0.6 V vs Ag/AgCl), and the FeOCl/CC cathode shows an excellent H2O2 activation performance where the removal percentage of tetracycline (TC, a rising refractory organic pollutant) reaches 98.2% in 5 min ([H2O2] = 1.0 mmol/L, C 0 = 10.0 mg/L, pH 3, and −0.8 V vs Ag/AgCl). The double-cathode EF system is proved by TC degradation. The removal percentage of TC achieves 96% in 20 min and total organic carbon (TOC) removal percentage reaches 92% in 2 h (C 0 = 10.0 mg/L, pH 5, and −0.6 V vs Ag/AgCl) in a static system. Furthermore, the system is highly effective in a wide pH range from 3 to 7. Significantly, in the continuous-flow system, the TC degradation percentage reaches 95% within 1.5 h, the mineralization reaches 88% within 4 h (C 0 = 10.0 mg/L, v = 4 mL/min, pH 5, and −0.6 V vs Ag/AgCl), and the performance remains highly stable even after prolonging for 15 h. The system has a high oxidative flux (1510 mg/(min m2)) and low energy consumption (45 kWh/(kg TOC)). Encouragingly, such a small-scale reactor (V = 100 mL, 4 mL/min) can treat 5.76 L of TC wastewater in one day. The toxicity of TC solution is remarkably reduced after EF treatment. This study would advance the practical application of an EF treatment process.

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“…Latterly, the combination of treatment processes has led to improved treatment techniques due to the synergistic effect between them. Among the different alternatives, advanced oxidation processes (AOPs) have been demonstrated to be effective for removing organic pollutants from wastewater [129,130]. Recently, in the literature several processes have been reported in which the biochar is used as a catalyst to AOPs or the AOPs are applied to the exhausted biochar regeneration.…”

Section: Regeneration Of Biocharmentioning

confidence: 99%

Unravelling the Environmental Application of Biochar as Low-Cost Biosorbent: A Review

et al. 2020

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In this age, a key target for enhancing the competitiveness of the chemical, environmental and biotechnology industries is to manufacture high-value products more efficiently and especially with significantly reduced environmental impact. Under this premise, the conversion of biomass waste to a high-value added product, biochar, is an interesting approach under the circular economy principles. Thus, the improvements in the biochar production and its new and innovative uses are hot points of interest, which are the focus of vast efforts of the scientific community. Biochar has been recognized as a material of great potential, and its use as an adsorbent is becoming a reliable strategy for the removal of pollutants of different streams, according to its high adsorption capacity and potential to eliminate recalcitrant compounds. In this review, a succinct overview of current actions developed to improve the adsorption capability of biochar, mainly of heavy metal and organic pollutants (dyes, pharmaceuticals and personal care products), is summarized and discussed, and the principal adsorption mechanisms are described. The feedstock and the production procedure are revealed as key factors that provide the appropriate physicochemical characteristics for the good performance of biochar as an adsorbent. In addition, the modification of the biochar by the different described approaches proved their feasibility and became a good strategy for the design of selective adsorbents. In the last part of this review, the novel prospects in the regeneration of the biochar are presented in order to achieve a clean technology for alleviating the water pollution challenge.

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Iron-doped cathodes for electro-Fenton implementation: Application for pymetrozine degradation

Cited by 38 publications

References 49 publications

Heterogeneous Advanced Oxidation Processes: Current Approaches for Wastewater Treatment

Heterogeneous Advanced Oxidation Processes: Current Approaches for Wastewater Treatment

Highly Efficient Continuous-Flow Electro-Fenton Treatment of Antibiotic Wastewater Using a Double-Cathode System

Unravelling the Environmental Application of Biochar as Low-Cost Biosorbent: A Review

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