Competitive adsorption studies of caffeine and diclofenac aqueous solutions by activated carbon

Sotelo, J.L.; Ovejero, Gabriel; Rodrı́guez, A.; Álvarez, Silvia; Galán, J.; Garcı́a, Juan

doi:10.1016/j.cej.2013.11.094

Cited by 222 publications

(108 citation statements)

References 41 publications

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“…It is therefore conceivable that hydrophobic interactions also govern the adsorption of CAF and CIP onto WHB. Other studies involving carbonaceous adsorbents have reported similar observations [4].…”

Section: Adsorption Mechanism Studiessupporting

confidence: 74%

“…PhCs have been frequently detected in surface waters, treated WWs (wastewaters) and in drinking portable waters [2][3][4]. Their occurrence in water and exposure to non-target organisms has been associated with chronic toxicity, endocrine disruption, development of bacteria resistantstrains and congenital anomalies [5].…”

Section: Introductionmentioning

confidence: 99%

“…It is described as one of the most high yielding plant, with 10 plants yielding up to 600,000 more within an 8-month growing period and completely covering upto 0.4 ha (1 acre) of a natural freshwater surface [7]. In the present work, water hyacinth biomass is used as a precursor for development of residue-derived biochar for removal of caffeine (1-cyclopropyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-quinoline-3-carboxyli c acid) (CAF) (a central nervous stimulant) and [Adopted from 4,9] ciprofloxacin (1,3,7-Trimethylpurine-2,6-dione) (CIP) (an antibacterial agent) ( Fig. 1)from aqueous solutions, as model PhCs.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Orata¹,

Lilechi²,

Kimosop³

2016

JCCE

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Abstract:In this work, the adsorptive features of water hyacinth (Eichhornia crassipes) derived biochar for sequestration of ciprofloxacin and caffeine from aqueous solution is reported. The isothermal behaviour, adsorption kinetics, mechanisms and thermodynamic parameters were investigated in batch mode. Langmuir and Freundlich models described the equilibrium adsorption data with regression values > 0.9. The kineticsdata obeyed the pseudo-second-order kinetic law while intraparticle pore diffusion was not the only rate controlling step. The computed thermodynamic parameters, namely change in Gibbs free energy (ΔG), change in enthalpy (ΔH) and change in entropy (ΔS) indicated that the adsorption processes were spontaneous and exothermic with less randomness. pH dependence studies depicted multi-mechanistic adsorption for both compounds and is hypothesized to involve hydrophobic interactions besides other non-coulombic interactions. The findings demonstrate that water hyacinth biochar presents an excellent low cost and environmentally benign adsorbent for mitigation of pharmaceuticals from water with a removal efficiency of above 60 % for caffeine and ciprofloxacin.

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Section: Adsorption Mechanism Studiessupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Orata¹,

Lilechi²,

Kimosop³

2016

JCCE

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“…Ibuprofen sodu i naproksen sodu są solami słabych kwasów i silnych zasad (pKa ibuprofenu wynosi 4,91, a naproksenu 4,15) i jako silne elektrolity są dobrze rozpuszczalne w wodzie. Po rozpuszczeniu sole te są prawie całkowicie zdysocjowane [10][11][12].…”

Section: Metodyka Badańunclassified

“…Efektywniejsza adsorpcja ibuprofenu sodu i naproksenu sodu może być związana z tym, że te związki chemiczne charakteryzują się wyższą wartością współczynni-ka n-oktanol/woda, którego wartość dla naproksenu sodu wynosi 3,18, ibuprofenu sodu 3,5, a kwasu salicylowego 2,26. Im wyższa wartość współczynnika n-oktanol/ woda, tym silniej dany związek chemiczny jest adsorbowany na węglach aktywnych [12]. Kwas salicylowy jest również najmniejszym (najlżejszym) związkiem (tab.…”

Section: Wyniki Badańunclassified

Adsorption of Selected Pharmaceuticals in High-temperature Modification of Activated Carbon WG-12

Szymonik

Lach

2016

Eng. Prot. Environ.

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Preparation of magnetic nanoparticles functionalized with poly (styrene‐2‐acrylamido‐2‐methyl propanesulfonic acid) as novel adsorbents for removal of pharmaceuticals from aqueous solutions

Hayasi

Saadatjoo

2017

Adv Polym Technol

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This work describes the removal of three pharmaceuticals, namely ceftriaxone sodium (CFX), diclofenac sodium (DCF) and atenolol (ATN) from water using magnetic poly (styrene-2-acrylamido-2-methyl propanesulfonic acid) (St-AMPS) adsorbent. This adsorbent was characterized by several techniques such as FTIR, TEM, TGA, VSM and DLS. Three kinetic models, pseudo-first-order, pseudo-secondorder and intra-particle diffusion models were used to study the adsorption kinetics.The results showed that the adsorption kinetics of pharmaceuticals onto magnetic poly (St-AMPS) adsorbent followed the pseudo-second-order model and were relatively rapid. In addition, it was found that the intra-particle diffusion was not the sole rate-controlling step and the adsorption of pharmaceuticals onto adsorbent occurred via two steps adsorption process. The experimental data were fitted with three isotherm models including Freundlich, Langmuir and Dubinin-Radushkevich (D-R). It was found that the adsorption of pharmaceuticals onto magnetic poly (St-AMPS) nanoparticles was the best described by the Langmuir model. Maximum adsorption capacities of 150.602, 47.824 and 119.904 mg/g were obtained for DCF, ATN and CFX, respectively. Also the obtained free energy from D-R isotherm (6.19, 4.93 and 6.45 kJ/mol for DCF, ATN and CFX respectively) indicated that the adsorption process was a physiosorption. Magnetic poly (St-AMPS) adsorbent could be recycled for removal of CFX, DCF and ATN by alkaline aqueous solution (pH 8). Therefore, this adsorbent can act as a promising adsorbent for water treatment processes. K E Y W O R D Sadsorption, magnetic separation, pharmaceutical, poly (styrene-2-acrylamido-2-methyl propanesulfonic acid), regeneration

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Competitive adsorption studies of caffeine and diclofenac aqueous solutions by activated carbon

Cited by 222 publications

References 41 publications

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies

Adsorption of Selected Pharmaceuticals in High-temperature Modification of Activated Carbon WG-12

Preparation of magnetic nanoparticles functionalized with poly (styrene‐2‐acrylamido‐2‐methyl propanesulfonic acid) as novel adsorbents for removal of pharmaceuticals from aqueous solutions

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