The simultaneous adsorption and desorption of flavonoids from bitter orange peel by the carboxylated multi-walled carbon nanotubes

Gholizadeh, Hassan; Ghorbani‐HasanSaraei, Azade; Tahermansouri, Hasan; Shahidi, Seyed‐Ahmad

doi:10.1007/s42823-019-00023-1

Cited by 11 publications

(11 citation statements)

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“…Different techniques are applied for the characterization of MWCNT‐COOH, such as fourier transform infrared spectroscopy, thermogravimetric analysis, derivative thermogravimetric, and scanning electron microscopy, which we explained in the previous report …”

Section: Resultsmentioning

confidence: 99%

“…Chromatograms of (a) the crude extract; (b) the mixed standard references; (c) after desorption and separation …”

Section: Resultsmentioning

confidence: 99%

“…On the basis of the obtained results, the performance of the MWCNT‐COOH for adsorption of rutin from water/ethanol solution was 89% (50 ppm, 40 mL, 30 mg of adsorbent, and contact time of 60 min), and from the extract of bitter orange peel, it was calculated to be about 50% (38.39 ppm, 10 mL, 50 mg of adsorbent, and contact time of 60 min). As there are many different compounds in the extract,the efficiency of MWCNT‐COOH for the adsorption of rutin can be acceptable and useful in the range of the studied concentrations.…”

Section: Resultsmentioning

confidence: 99%

“…This application of CNTs is related to their large surface areas, π–π electrostatic interactions, and shorter equilibrium time compared to other materials. Until now, a few reports have been presented on the adsorption of rutin from aqueous solutions …”

Section: Introductionmentioning

confidence: 99%

“…In addition, the other goal of this investigation was to compare the sorption capacity of MWCNT‐COOH for the adsorption of rutin from water/ethanol solution and extract of bitter orange peel. It should be noted that we studied the process of adsorption in water/ethanol solution because of the suitable simulation and comparison with the extraction conditions of flavonoids from bitter orange peel in our previous work …”

Section: Introductionmentioning

confidence: 99%

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The mechanism studies of the adsorption–desorption process of rutin from water/ethanol solution and the extract of bitter orange peel by the carboxylated multiwalled carbon nanotubes

Gholizadeh

Ghorbani‐HasanSaraei

Tahermansouri

et al. 2019

J Chinese Chemical Soc

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Carboxylated multiwall carbon nanotubes (MWCNTs-COOH) have been used as an efficient adsorbent for the adsorption of rutin from water/ethanol solution and extract of bitter orange peel. Batch experiments such as solution pH, adsorbent dosage, contact time, concentration of the rutin, and temperature were carried out to study the sorption process. Kinetic studies were well described by a pseudosecondorder kinetic model for MWCNT-COOH. Besides, the adsorbed values of rutin at equilibrium were calculated to be 62.89 mg/g, which agreed well with the experimental data (62.13 mg/g). Isotherm studies showed that the Langmuir isotherm was found to be the best model for the description of the sorption data. ΔG values at temperatures of 298, 308, and 318 K were −1.9, −4.5, and −5.3 kJ/mol, respectively; these negative values for MWCNT-COOH indicated the nature of the spontaneous adsorption process. In addition, rutin molecules can be desorbed from MWCNT-COOH by up to 93.4% of the sorbed amount by increasing the solution pH to 11, which indicates the ability of reutilization of MWCNT-COOH. In addition, the results of high-performance liquid chromatography (HPLC) showed that MWCNT-COOH leads to the adsorption and extraction of rutin about 50% from the extract of bitter orange peel. K E Y W O R D Sadsorption, carbon nanotube, desorption, extract, mechanism, Rutin

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Section: Resultsmentioning

confidence: 99%

“…Chromatograms of (a) the crude extract; (b) the mixed standard references; (c) after desorption and separation …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%