Voltammetric determination of flufenamic acid and adsorption studies with biochar in the absence / presence of cetyltrimethylammonium bromide

Kamenická, Barbora; Weidlich, Tomáš; Švancara, Ivan

doi:10.1016/j.talanta.2023.125073

Cited by 4 publications

(2 citation statements)

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“…For a detailed description of the determination method, see ref. [40,41]. 1 H NMR spectra were recorded in DMSO-d 6 solutions on a Bruker Avance 500 spectrometer (equipped with a Z-gradient 5mm Prodigy TM cryoprobe) at a frequency of 500.14 MHz or on a Bruker UltraShield TM 400 spectrometer at a frequency of 400.13 MHz at 295 K. The solutions were obtained by dissolving dried ion pairs (resulting from the work-up of reaction mixtures) in 1 mL of DMSO-d 6 .…”

Section: Chemical Analysismentioning

confidence: 99%

“…Our previous works [25,27,40,41,50] proved that the addition of R 4 NX to the aqueous solutions of acidic halogenated compounds (-COO − od -SO 3 − groups), including dyes or drugs caused the ion exchange and the formation of respective insoluble ion pairs (Contaminant-COONR 4 , see Equation ( 9)) that can be separated from aqueous solutions by simple filtration.…”

Section: Enhanced Adsorption Using Bacmentioning

confidence: 99%

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Sorption of Halogenated Anti-Inflammatory Pharmaceuticals from Polluted Aqueous Streams on Activated Carbon: Lifetime Extension of Sorbent Caused by Benzalkonium Chloride Action

Kamenická,

Weidlich,

Pouzar

2023

Water

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The enhancement of the adsorption capacity of activated carbon (AC) using benzalkonium chloride (BAC) within the adsorption of halogenated pharmaceuticals flufenamic acid (flufa) and diclofenac (dcf) was investigated in this study. An adsorption kinetic study was performed to evaluate the adsorption mechanisms. The adsorption mechanism of both drugs on granulated AC as well as saturated AC activated by BAC can be evaluated via pseudo-second kinetic order. The equilibrium adsorption capacity of spent granulated AC in co-action with BAC (qflufa = 195.5 mg g−1 and qdcf = 199.5 mg g−1) reached the adsorption capacity of virgin granulated AC (qflufa = 203.9 mg g−1 and qdcf = 200.7 mg g−1). Finally, batch and column arrangements were compared in an effort to possible practical application of exhausted AC in co-action with BAC. In both column and batch experiments, adsorption capacities of spent granulated AC for flufa increased using BAC by 170.4 mg g−1 and 560.4 mg g−1, respectively. The proposed mechanism of adsorption enhancement is the formation of less polar ion pairs and its better affinity to the non-polar AC surface. The drug concentrations were determined using the voltammetric method on carbon paste electrodes. The formation of ion pairs has been studied by the H1 NMR technique, and solubility in water of drugs and respective ion pairs were investigated using octan-1-ol/water coefficients (POW).

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Section: Chemical Analysismentioning

confidence: 99%