Naproxen removal by CWPO with Fe3O4/multi-walled carbon nanotubes in a fixed-bed reactor

Huaccallo-Aguilar, Y.; Larriba, Marcos; Águeda, V.I.; Delgado, José A.; Ovejero, Gabriel; Peres, José A.; Garcı́a, Juan

doi:10.1016/j.jece.2021.105110

Cited by 6 publications

(6 citation statements)

References 48 publications

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“…In sequence to give a new response surface, the catalyst concentration in a NAP-DCF mixture solution (C 0 = 5 mg L −1 each one) was maintained constant at 1.0 g L −1 . This concentration was taken as a reference from some previous research on CWPO [10].…”

Section: Statistical Analysis Through Response Surface Methodology: B...mentioning

confidence: 99%

“…From AOPs, the catalytic wet peroxide oxidation (CWPO) process has been demonstrated to be highly effective in the removal of aromatic compounds, herbicides, pesticides, azo dyes, and pharmaceutical compounds at mild conditions [10]. CWPO is mostly applied due to its simplicity in terms of equipment and management operation compared to homogeneous Fenton [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, many researchers have studied several catalysts. From the catalysts studied, Fe 3 O 4 supported on multiwalled carbon nanotubes (Fe 3 O 4 /MWCNTs) has shown as an effective material in a wider range of pH (8)(9)(10) in CWPO with the additional advantage of its easy recovery due to its magnetic properties. In the catalyst, it is noteworthy the function of MWCNTs as stable support even at drastic acidic and temperature conditions, and the role for the dispersion of magnetite onto its surface, obtaining a magnetic catalyst with minimum leaching of iron and so the minimum reduced toxicity towards the reaction medium [18].…”

Section: Introductionmentioning

confidence: 99%

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Magnetite-Based Catalyst in the Catalytic Wet Peroxide Oxidation for Different Aqueous Matrices Spiked with Naproxen–Diclofenac Mixture

et al. 2021

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Magnetite supported on multiwalled carbon nanotubes catalysts were synthesized by co-precipitation and hydrothermal treatment. The magnetic catalysts were characterized by X-ray diffraction, Fourier-transform infrared spectrometry, thermogravimetric analysis and N2 physisorption. The catalysts were then tested for their ability to remove diclofenac (DCF) and naproxen (NAP) from an aqueous solution at different conditions (pH, temperature, and hydrogen peroxide) to determine the optimum conditions for chemical oxidation. The optimization of the process parameters was conducted using response surface methodology (RSM) coupled with Box–Behnken design (BBD). By RSM–BBD methodology, the optimal parameters (1.75 mM H2O2 dosage, 70 °C and pH 6.5) were determined, and the removal percentages of NAP and DCF were 19 and 54%, respectively. The NAP–DCF degradation by catalytic wet peroxide oxidation (CWPO) was caused by •OH radicals. In CWPO of mixed drug solutions, DCF and NAP showed competitive oxidation. Hydrophobic interactions played an important role during the CWPO process. On the other hand, the magnetic catalyst reduced its activity after the second cycle of reuse. In addition, proof of concept and disinfection tests performed at the operating conditions showed results following the complexity of the water matrices. In this sense, the magnetic catalyst in CWPO has adequate potential to treat water contaminated with NAP–DCF mixtures.

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Section: Statistical Analysis Through Response Surface Methodology: B...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetite-Based Catalyst in the Catalytic Wet Peroxide Oxidation for Different Aqueous Matrices Spiked with Naproxen–Diclofenac Mixture

et al. 2021

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“…In particular, those based on synthesized magnetite have received major attention, which can be attributed to the presence of both Fe(II) and Fe(III) species, which significantly fasten the oxidation rate (Munoz et al 2015 ). In general, catalysts preparation involves the use of synthetic organic or inorganic supports and requires relatively complex multi-step procedures like incipient wetness impregnation followed by high-temperature calcination (di Luca et al 2018 ; Ding et al 2020 ), combination of thermal treatments and metal–organic chemical vapor deposition (Yang et al 2018 ), clay intercalation by auto-hydrolysis followed by calcination (Pinchao et al 2021 ) or chemical co-precipitation and hydrothermal treatment (Huaccallo-Aguilar et al 2021a , b ; Huaccallo-Aguilar et al 2021a , b ). There are also attempts using different kinds of wastes as carbon support precursors like PET bottles (Thirumoorthy et al 2021 ) or olive stones (Esteves et al 2022 ), but in both cases, complex multi-step procedures and carbonization at high temperatures were required.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it must be noted that most CWPO applications were focused on the treatment of aromatic compounds as well as dyes and industrial wastewaters at relatively high pollutant concentrations (mg L −1 –g L −1 ). Studies focused on the abatement of micropollutants are scarce and carried out at pollutant concentrations clearly higher than the representative concentration at WWTP effluents (Huaccallo-Aguilar et al 2021a , b ; Huaccallo-Aguilar et al 2021a , b ). Furthermore, most works were performed at relatively high operating temperature (50–90 °C), and long-term studies are limited, with most publications testing time on stream of 1–3 days.…”

Section: Introductionmentioning

confidence: 99%

Natural magnetite as an effective and long-lasting catalyst for CWPO of azole pesticides in a continuous up-flow fixed-bed reactor

Lopez-Arago,

Munoz,

de Pedro

et al. 2024

Environ Sci Pollut Res

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The global occurrence of micropollutants in water bodies has raised concerns about potential negative effects on aquatic ecosystems and human health. EU regulations to mitigate such widespread pollution have already been implemented and are expected to become increasingly stringent in the next few years. Catalytic wet peroxide oxidation (CWPO) has proved to be a promising alternative for micropollutant removal from water, but most studies were performed in batch mode, often involving complex, expensive, and hardly recoverable catalysts, that are prone to deactivation. This work aims to demonstrate the feasibility of a fixed-bed reactor (FBR) packed with natural magnetite powder for the removal of a representative mixture of azole pesticides, recently listed in the EU Watch Lists. The performance of the system was evaluated by analyzing the impact of H2O2 dose (3.6–13.4 mg L−1), magnetite load (2–8 g), inlet flow rate (0.25–1 mL min−1), and initial micropollutant concentration (100–1000 µg L−1) over 300 h of continuous operation. Azole pesticide conversion values above 80% were achieved under selected operating conditions (WFe3O4 = 8 g, [H2O2]0 = 6.7 mg L−1, flow rate = 0.5 mL min−1, pH0 = 5, T = 25 °C). Notably, the catalytic system showed a high stability upon 500 h in operation, with limited iron leaching (< 0.1 mg L−1). As a proof of concept, the feasibility of the system was confirmed using a real wastewater treatment plant (WWTP) effluent spiked with the mixture of azole pesticides. These results represent a clear advance for the application of CWPO as a tertiary treatment in WWTPs and open the door for the scale-up of FBR packed with natural magnetite.

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Beyond batch experiments: unveiling the potential of bimetallic carbon xerogels for catalytic wet peroxide oxidation of hospital wastewater in continuous mode

Santos Silva,

Roman,

Ribeiro

et al. 2024

Environ Sci Pollut Res

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Single- and bimetallic carbon xerogels were prepared by incorporating iron and iron-cobalt precursors during their synthesis, respectively, and tested in the catalytic wet peroxide oxidation (CWPO) of ibuprofen spiked into a simulated matrix in batch mode. The bimetallic catalyst outperformed single and non-metallic catalyst by 25 and 85% after 360 min of reaction, at mild temperature (30 °C). The best-performing catalyst was further used to treat hospital wastewater in a CWPO system operating in full continuous mode. Process optimization was carried out considering different catalyst loads, temperatures, and pH. The results obtained showed that the best conditions are initial pH 3, T = 80 °C, and a catalyst load of 35.4 mg cm−3. Having maintained values of chemical oxygen demand (COD) removals as high as 80% after 24 h of continuous operation, the results herein reported revealed the high potential of the bimetallic carbon xerogel for CWPO of hospital wastewater beyond conventional applications in batch mode. Despite some catalytic deactivation, the bimetallic carbon xerogel still delivered a mineralization degree as high as 55% of the initial total organic carbon (TOC) content of the hospital wastewater in the third 24-h cycle of CWPO in continuous mode of operation with successive catalyst reuse, as opposed to a 73% TOC removal in the first cycle. Therefore, our results open prospects for the implementation of CWPO for hospital wastewater treatment in continuous mode of operation.

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Naproxen removal by CWPO with Fe3O4/multi-walled carbon nanotubes in a fixed-bed reactor

Cited by 6 publications

References 48 publications

Magnetite-Based Catalyst in the Catalytic Wet Peroxide Oxidation for Different Aqueous Matrices Spiked with Naproxen–Diclofenac Mixture

Magnetite-Based Catalyst in the Catalytic Wet Peroxide Oxidation for Different Aqueous Matrices Spiked with Naproxen–Diclofenac Mixture

Natural magnetite as an effective and long-lasting catalyst for CWPO of azole pesticides in a continuous up-flow fixed-bed reactor

Beyond batch experiments: unveiling the potential of bimetallic carbon xerogels for catalytic wet peroxide oxidation of hospital wastewater in continuous mode

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