Diclofenac sorption from synthetic water: Kinetic and thermodynamic analysis

Salvestrini, Stefano; Fenti, Angelo; Chianese, Simeone; Iovino, Pasquale; Musmarra, Dino

doi:10.1016/j.jece.2020.104105

Cited by 42 publications

(27 citation statements)

References 75 publications

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“…The obtained data show that the performance of the current adsorbents is comparable to the conventional adsorbents. For example, the reported q max of a commercial activated carbon (Filtrasorb 400) towards diclofenac was 180 mg/g [63]. The performance was even better when compared to the multi-and single-walled carbon nanotubes towards hydrochlorothiazide with q max of 66.22 mg/g and 45.66 mg/g, respectively [64].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption Characteristics of Pristine and Magnetic Olive Stones Biochar with Respect to Clofazimine

et al. 2021

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Olive stone biochars (OSBC), both pristine and following magnetization (MAG–OSBC), were utilized as eco-friendly and cost-effective sorbents for the antituberculosis, clofazimine (CLOF). Morphologies, textures, surface functionalities, and thermal stabilities of both adsorbents were explored using SEM, EDX, TEM, BET, FT-IR, Raman, XRD and TGA analyses. SEM analysis showed meso- and macroporous surfaces. BET data showed that the MAG–OSBC possesses a larger surface area (33.82 m2/g) and pore volume. Batch adsorption studies were conducted following the experimental scenario of Box–Behnken (BB) design. The adsorption efficiency of both adsorbents was evaluated in terms of the % removal (%R) and the sorption capacity (qe, mg/g). Dependent variables (%R and qe) were maximized as a function of four factors: pH, sorbent dose (AD), the concentration of CLOF ([CLOF]), and contact time (CT). A %R of 98.10% and 98.61% could be obtained using OSBC and MAG–OSBC, respectively. Equilibrium studies indicated that both Langmuir and Freundlich models were perfectly fit for adsorption of CLOF. Maximum adsorption capacity (qmax) of 174.03 mg/g was obtained using MAG–OSBC. Adsorption kinetics could be best illustrated using the pseudo-second-order (PSO) model. The adsorption–desorption studies showed that both adsorbents could be restored with the adsorption efficiency being conserved up to 92% after the sixth cycles.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption Characteristics of Pristine and Magnetic Olive Stones Biochar with Respect to Clofazimine

et al. 2021

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“…A study conducted in the wastewater treatment plant sites in India reported that the total NSAIDs recorded were between 0.02 and 30 mg day −1 per 1000 individual 22 . Moreover, a recent research on the removal of Diclofenac using activated carbon was performed at the initial sorbate concentration of 24 to 218 mg L −1 and reported the maximum adsorption capacity to be 180 mg g −1 23 .…”

Section: Introductionmentioning

confidence: 99%

Kinetic and isotherm insights of Diclofenac removal by sludge derived hydrochar

Oumabady

Sebastian

Kalaiselvi

et al. 2022

Sci Rep

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Recently, hydrothermal carbonization emerges as the most viable option for the management of solid waste with high moisture content. Sludge derived hydrochar is used as an adsorbent for emerging contaminants or micro-pollutants in the domain of sustainability. Current study demonstrates the KOH activation of hydrochar produced from paper board mill sludge and evaluates its removal potential of a Non-steroidal anti-inflammatory drug, Diclofenac from aqueous solution. The activated hydrochars exhibited porous, spherical micro-structures with higher fraction of oxygenated functional groups paving way for the efficient adsorption of Diclofenac. The effect of initial Diclofenac concentration and contact time was ascertained using adsorption kinetics and isotherms. The adsorption kinetics exhibited second-order reaction for all adsorbents indicating higher coefficient of determination (R2 > 0.9). The Diclofenac adsorption on hydrochars followed Langmuir isotherm model with the post-activated hydrochar recording a highest adsorption capacity of 37.23 mg g−1 in 40 mg L−1 initial Diclofenac concentration at 15 h equilibrium time.

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“…A negative or positive ∆G • only indicates the spontaneity or non-spontaneity, respectively, of a hypothetical sorption process in which the reagents (sorbent and solute) and the product (adsorbent-solute adduct) are both in standard conditions [88]. The sign of ∆G • may even depend on the selected standard state [88,89]. It is worth remarking that the choice of the standard state not only influences the sign of ∆G • (hence the value of K [90]), but also the sign and magnitude of ∆S • (∆H • is independent on the standard state because the ratio between K values at two different standard states is constant (see Equation ( 24)).…”

Section: Sorption Thermodynamicsmentioning

confidence: 99%

Cr(VI) Sorption from Aqueous Solution: A Review

et al. 2020

Self Cite

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Hexavalent chromium (Cr(VI)) in water systems is a major hazard for living organisms, including humans. The most popular technology currently used to remove Cr(VI) from polluted water is sorption for its effectiveness, ease of use, low cost and environmental friendliness. The electrostatic interactions between chromium species and the sorbent matrix are the main determinants of Cr(VI) sorption. The pH plays a central role in the process by affecting chromium speciation and the net charge on sorbent surface. In most cases, Cr(VI) sorption is an endothermic process whose kinetics is satisfactorily described by the pseudo second-order model. A critical survey of the recent literature, however, reveals that the thermodynamic and kinetic parameters reported for Cr(VI) sorption are often incorrect and/or erroneously interpreted.

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Diclofenac sorption from synthetic water: Kinetic and thermodynamic analysis

Cited by 42 publications

References 75 publications

Adsorption Characteristics of Pristine and Magnetic Olive Stones Biochar with Respect to Clofazimine

Adsorption Characteristics of Pristine and Magnetic Olive Stones Biochar with Respect to Clofazimine

Kinetic and isotherm insights of Diclofenac removal by sludge derived hydrochar

Cr(VI) Sorption from Aqueous Solution: A Review

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