Degradation of anti-inflammatory drug diclofenac using cobalt ferrite as photocatalyst

Gerbaldo, María Verónica; Marchetti, Sérgio Gustavo; Elías, Verónica Rita; Mendieta, Silvia Nazaret; Crivello, Mónica E.

doi:10.1016/j.cherd.2020.12.009

Cited by 32 publications

(16 citation statements)

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“…Generally, the main disadvantage of oxidation processes involves the consumption of high excess oxidants for the formation of biodegradable products. In addition, many of the published papers dealing with the application of AOPs for DCF removal only quantified DCF content in the aqueous solution obtained after tested AOP method treatment [ 16 , 17 , 18 , 19 ] ( Table 1 ). Moreover, some papers mentioned the high toxicity of formed primary oxidation or photolysis products [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Raney Al-Ni Alloy for Simple Hydrodehalogenation of Diclofenac and Other Halogenated Biocidal Contaminants in Alkaline Aqueous Solution under Ambient Conditions

et al. 2022

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Raney Al-Ni contains 62% of Ni2Al3 and 38% NiAl3 crystalline phases. Its applicability has been studied within an effective hydrodehalogenation of hardly biodegradable anti-inflammatory drug diclofenac in model aqueous concentrates and, subsequently, even in real hospital wastewater with the aim of transforming them into easily biodegradable products. In model aqueous solution, complete hydrodechlorination of 2 mM aqueous diclofenac solution (0.59 g L−1) yielding the 2-anilinophenylacetate was achieved in less than 50 min at room temperature and ambient pressure using only 9.7 g L−1 of KOH and 1.65 g L−1 of Raney Al-Ni alloy. The dissolving of Al during the hydrodehalogenation process is accompanied by complete consumption of NiAl3 crystalline phase and partial depletion of Ni2Al3. A comparison of the hydrodehalogenation ability of a mixture of diclofenac and other widely used halogenated aromatic or heterocyclic biocides in model aqueous solution using Al-Ni was performed to verify the high hydrodehalogenation activity for each of the used halogenated contaminants. Remarkably, the robustness of Al-Ni-based hydrodehalogenation was demonstrated even for the removal of non-biodegradable diclofenac in real hospital wastewater with high chloride and nitrate content. After removal of the insoluble part of the Al-Ni for subsequent hydrometallurgical recycling, the low quantity of residual Ni was removed together with insoluble Al(OH)3 obtained after neutralization of aqueous filtrate by filtration.

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Section: Introductionmentioning

confidence: 99%

Application of Raney Al-Ni Alloy for Simple Hydrodehalogenation of Diclofenac and Other Halogenated Biocidal Contaminants in Alkaline Aqueous Solution under Ambient Conditions

et al. 2022

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“…al. siguiendo el método de Pechini (Gerbaldo et al, 2021). En esta oportunidad se empleó el material calcinado a 800°C.…”

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“…Tabla 1: Caracterización del material (Gerbaldo et al, 2021) Los experimentos fueron desarrollados en un reactor tubular de lecho fijo con control de temperatura. En el interior del mismo se aloja el catalizador junto con virolas de vidrio.…”

Section: Técnicaunclassified

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Degradación de diclofenac sódico mediante oxidación húmeda catalítica empleando CoFe2O4

Gerbaldo

Crivello²,

Mendieta³

et al. 2022

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En este trabajo se presenta el estudio de la degradación de diclofenac sódico en solución acuosa empleando oxidación húmeda catalítica. Se investigaron los parámetros de operación tales como la alimentación del reactor, flujo de oxidante y temperatura de reacción. Las reacciones experimentales se desarrollaron en un reactor de lecho fijo utilizando oxígeno puro y ferrita de cobalto como catalizador. Las condiciones óptimas para el proceso resultaron: concentración de contaminante= 40 mg/L, flujo de oxígeno = 150 mL/L, alimentación del reactor = 0,25 mL/L y temperatura de reacción = 200°C. En estas condiciones se degradó el 97,59% del fármaco en un proceso continuo. También se estudió la cinética de reacción. El proceso pudo describirse mediante una cinética de pseudo-primer orden. La energía de activación aparente se calculó en 20,75 kJ/mol. Los resultados indican que este proceso podría utilizarse como método de tratamiento para aguas residuales que contengan compuestos farmacéuticos.

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“…Several factors such as particle size, shape and porosity that are closely related to the synthesis method, have significant impact on the cobalt ferrite properties [12]. Among the chemical methods, special attention is given to coprecipitation and Pechini methods [13,14], sol-gel process [15,16], hydrothermal/solvothermal technique [1,[17][18][19], precursor method [20], combustion method and microwave-assisted combustion method [21][22][23][24], microemulsion method [7] and polyol process [25]. Das et al [17] reported a significant modification in the size of the particles and magnetic properties when adding the CTAB surfactant in the synthesis of CoFe 2 O 4 nanoparticles through the hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

et al. 2021

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This paper describes for the first time two processing routes-the precursor method and the two-step wet chemical process-for the synthesis of magnetic cobalt ferrite using the Tamarindus indica fruit extract. These green approaches are eco-friendly, safe and efficient alternatives to classical chemical methods. The aqueous extract from tamarind fruit contains numerous metabolites (organic acids, aminoacids). All these bioactive components are able to chelate metal ions leading to the formation of the multimetallic complex (precursor of cobalt ferrite). The obtained precursor was characterized by Fourier transform infrared spectroscopy (FTIR), thermal analysis, X-ray diffraction analysis (XRD) and magnetic measurements. The structure, morphology and magnetic behavior of the cobalt ferrite samples prepared through both synthesis routes were investigated by various characterization techniques: FTIR, XRD, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), Mössbauer spectroscopy and magnetic measurements. XRD data confirmed that a cubic spinel structure was obtained for both ferrite powders with average crystallite size of 13 and 5 nm, respectively. The microstructure study by SEM revealed the formation of nanocrystallites assemblies using the precursor method and carbon-rich particles forming granulated micron-sized agglomerates, embedding ferrite nanocrystallites obtained through the two-step wet chemical process. Mössbauer spectroscopy results evidenced relaxation processes in the CoFe 2 O 4 samples at room temperature, and the main characteristics of the involved sublattices were derived. The magnetic investigation revealed a typical magnetic behavior for a spinel, with CoFe 2 O 4 nanoparticles ferrimagnetic at low temperature and superparamagnetic at room temperature.

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Degradation of anti-inflammatory drug diclofenac using cobalt ferrite as photocatalyst

Cited by 32 publications

References 41 publications

Application of Raney Al-Ni Alloy for Simple Hydrodehalogenation of Diclofenac and Other Halogenated Biocidal Contaminants in Alkaline Aqueous Solution under Ambient Conditions

Application of Raney Al-Ni Alloy for Simple Hydrodehalogenation of Diclofenac and Other Halogenated Biocidal Contaminants in Alkaline Aqueous Solution under Ambient Conditions

Degradación de diclofenac sódico mediante oxidación húmeda catalítica empleando CoFe2O4

Structural, morphological and magnetic investigations on cobalt ferrite nanoparticles obtained through green synthesis routes

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