Photodegradation of diclofenac in wastewaters

Iovino, Pasquale; Chianese, Simeone; Canzano, Silvana; Prisciandaro, Marina; Musmarra, Dino

doi:10.5004/dwt.2016.11063

Cited by 25 publications

(20 citation statements)

References 23 publications

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“…The Freundlich isotherm model is an empirical equation describing the adsorption on heterogeneous adsorbents [64]. This equation can be expressed as follows: q e = K F C 1/n e (10) where K F -Freundlich constant for a heterogeneous adsorbent (mg 1−1/n (dm 3 ) 1/n g −1 ), 1/n-the heterogeneity factor (the smaller 1/n, the greater the expected heterogeneity).…”

Section: Freundlich Modelmentioning

confidence: 99%

Ordered Mesoporous Carbons for Adsorption of Paracetamol and Non-Steroidal Anti-Inflammatory Drugs: Ibuprofen and Naproxen from Aqueous Solutions

Jedynak

Szczepanik

Rędzia

et al. 2019

Water

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The adsorption of paracetamol and non-steroidal anti-inflammatory drugs (ibuprofen and naproxen) on ordered mesoporous carbons (OMC) and, for comparison, on commercial activated carbon, were investigated in this work. OMC adsorbents were obtained by the soft-templating method and were characterized by low-temperature nitrogen adsorption and scanning electron microscopy (SEM). The effects of contact time and initial concentration of organic adsorbates on the adsorption were studied. The contact time to reach equilibrium for maximum adsorption was 360 min for all the studied adsorbates. The adsorption mechanism was found to fit pseudo-second-order and intra particle-diffusion models. Freundlich, Langmuir and Langmuir-Freundlich isotherm models were used to analyze equilibrium adsorption data. Based on the obtained experimental data, the adsorption isotherm in the applied concentration range for all the studied adsorbates was well represented by the Freundlich-Langmuir model. The adsorption ability of ordered mesoporous carbon materials was much higher for paracetamol and naproxen in comparison to commercial activated carbon. The removal efficiency for ibuprofen was significantly lower than for other studied pharmaceuticals and comparable for all adsorbents. Theoretical calculations made it possible to obtain optimized chemical structures of (S)-naproxen, ibuprofen, and paracetamol molecules. Knowledge of charge distributions of these adsorbate molecules can be helpful to explain why paracetamol and naproxen can react more strongly with the surface of adsorbents with a large numbers of acidic groups compared to ibuprofen facilitating more efficient adsorption of these pharmaceuticals on ordered mesoporous carbons.

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Section: Freundlich Modelmentioning

confidence: 99%

Ordered Mesoporous Carbons for Adsorption of Paracetamol and Non-Steroidal Anti-Inflammatory Drugs: Ibuprofen and Naproxen from Aqueous Solutions

Jedynak

Szczepanik

Rędzia

et al. 2019

Water

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“…Kp is also frequently found in surface waters, which constitutes a potential risk for aquatic ecosystems [21,22,23,24]. Besides the studies reported in literature about its removal [25,26,27,28,29,30], the proposed use of CH to treat water from the Kp, according to our knowledge, has been not yet investigated. Therefore, regarding this aspect, to better emphasize the capacity of CH, preliminary results are discussed in this paper, which opens a novel possibility to treat water polluted with emerging pollutants.…”

Section: Introductionmentioning

confidence: 99%

Chitosan Film as Eco-Friendly and Recyclable Bio-Adsorbent to Remove/Recover Diclofenac, Ketoprofen, and Their Mixture from Wastewater

et al. 2019

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This paper reported the first example on the use of chitosan films, without further modification, to remove and recover, through bio-sorption processes, the emerging pollutant Diclofenac from water. The latter was adopted as a model, among non-steroidal anti-inflammatory drugs, by obtaining a maximum adsorption capacity, qmax, on chitosan of about 10 mg/g, under the applied experimental conditions of work. The literature gap about the use of chitosan films, which was already used for dyes and heavy metals removal, to adsorb emerging pollutants from water was covered, claiming the wide range application of chitosan films to remove a different class of pollutants. Several parameters affecting the Diclofenac adsorption process, such as the pH and ionic strength of solutions containing Diclofenac, the amount of the bio-sorbent and pollutant, and the temperature values, were investigated. The kinetics and the adsorption isotherms, along with the thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were also evaluated. The process occurred very efficiently, and Chitosan/Diclofenac amounts dependent, remove about the 90% of the pollutant, in 2 h, from the tested solutions, through electrostatic interaction involving the carboxylic moiety of Diclofenac and Chitosan amino groups. This finding was confirmed by the pH and salt effects on the bio-sorption process, including swelling measurements of Chitosan films and by FTIR-ATR analysis. In detail, the maximum adsorption was observed at pH 5, when pollutant and Chitosan were negatively and positively charged, respectively. By reducing or increasing the pH around this value, a reduced affinity was observed. Accordingly, the presence of salts retarded the Diclofenac removal screening its charges, which hinders the interaction with Chitosan. The sorption was spontaneous (ΔG° < 0) and endothermic (ΔH° > 0) following the pseudo-second order kinetic model. The process was Diclofenac and Chitosan amount dependent. In addition, the Freundlich and Temkin isotherms well described the process, which showed the heterogeneous character of the process. Experiments of the complete desorption were also performed by using NaCl solutions 0.25 M (like sea water salt concentration) proposing the reuse of the pollutant and the recycling of the bio-sorbent lowering the associated costs. The versatility of the adsorbent was reported by exploring the possibility to induce the Diclofenac light-induced degradation after the adsorption and by-products adsorption onto chitosan films. To emphasize the chitosan capacity of treating water, the removal of another pollutant such as Ketoprofen and the mixture of Diclofenac and Ketoprofen were investigated. In this way, a green and eco-friendly production-pollution prevention technology for removing emerging pollutants from water was presented, which reduced the overall environmental impact. This illustrated experiments both in static and dynamic conditions for potential industrial applications.

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“…Luego de una corta exposición a luz Uv (Fotólisis) aparece un nuevo máximo a 240 nm (Figure 2 [M15]). De acuerdo con lo encontrado por Iovino et al [19] este nuevo pico es asociado a la aparición del dímero carbazol, un intermediario muy estable y de color amarillento. De esto se puede inferir que luego de 15 minutos de acción de luz, el diclofenac sódico es transformado en carbazol; mediante HPLC fue determinado que la concentración de diclofenac fue menor a 2 mg/L.…”

Section: Figura 2 Fotólisisunclassified

Estudio de la actividad catalítica de la ferrita de cobalto en la degradación de diclofenac sódico

Gerbaldo

Crivello²,

Mendieta³

et al. 2020

AJEA

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Los contaminantes emergentes y dentro de ellos los compuestos farmacéuticos suelen encontrarse en aguas superficiales y residuales a lo largo del planeta. En este trabajo se presenta el estudio de la degradación de diclofenac sódico mediante un proceso tipo foto-Fenton heterogéneo empleando ferritas de cobalto. Los materiales fueron sintetizados con el método de Pechini y caracterizados mediante difracción de rayos X, espectroscopía Mössbauer, espectroscopía fotoelectrónica de rayos X, espectroscopía Uv-visible, reducción a temperatura programada y área superficial. Se obtuvieron fases puras con estructura de espinela. Ambos materiales presentaron buenos resultados catalíticos en la degradación del contaminate. Se propone un mecanismo de reacción radicalario basado en la formación de radicales *OH. Se logró una degradación completa del compuesto, con un 86% de mineralización del carbono orgánico total empleando el material calcinado a 800°C. El catalizador presentó excelentes resultados en tres ciclos consecutivos de uso.

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Photodegradation of diclofenac in wastewaters

Cited by 25 publications

References 23 publications

Ordered Mesoporous Carbons for Adsorption of Paracetamol and Non-Steroidal Anti-Inflammatory Drugs: Ibuprofen and Naproxen from Aqueous Solutions

Ordered Mesoporous Carbons for Adsorption of Paracetamol and Non-Steroidal Anti-Inflammatory Drugs: Ibuprofen and Naproxen from Aqueous Solutions

Chitosan Film as Eco-Friendly and Recyclable Bio-Adsorbent to Remove/Recover Diclofenac, Ketoprofen, and Their Mixture from Wastewater

Estudio de la actividad catalítica de la ferrita de cobalto en la degradación de diclofenac sódico

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