Adsorption of Phenolic Compounds from Aqueous Solutions onto Chitosan-Coated Perlite Beads as Biosorbent

Kumar, Nadavala Siva; Suguna, Madala; Subbaiah, Munagapati Venkata; Reddy, A. Subba; Kumar, Niranjan; Krishnaiah, A.

doi:10.1021/ie901171b

Cited by 57 publications

(17 citation statements)

References 43 publications

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“…The results revealed that Langmuir sorption isotherm was a more linear model than Freundlich for the sorption of mandelic acid enantiomers on RMBAG‐SCMPs because correlation Langmuir coefficients (R 2 ) are greater than Freundlich. The important features of the Langmuir sorption isotherm parameter can be used to foresee the affinity between the sorbates and sorbent using a dimensionless constant called a separation factor or equilibrium parameter ( R L ), which is expressed by the following relationship

R_{L} = \frac{1}{1 + b C_{0}}

where b (L/mg) is the Langmuir constant and C 0 (mg/L) is the initial concentration of mandelic acid enantiomers. The value of R L indicated the type of Langmuir isotherm to be irreversible ( R L = 0), linear ( R L = 1), unfavorable ( R L > 1), or favorable (0 < R L < 1) .…”

Section: Resultsmentioning

confidence: 99%

Enantioseparation of Mandelic Acid Enantiomers With Magnetic Nano‐Sorbent Modified by a Chiral Selector

Tarhan

Tural

et al. 2015

Chirality

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In this study, R(+)-α-methylbenzylamine-modified magnetic chiral sorbent was synthesized and assessed as a new enantioselective solid phase sorbent for separation of mandelic acid enantiomers from aqueous solutions. The chemical structures and magnetic properties of the new sorbent were characterized by vibrating sample magnetometry, transmission electron microscopy, Fourier transform infrared spectroscopy, and dynamic light scattering. The effects of different variables such as the initial concentration of racemic mandelic acid, dosage of sorbent, and contact time upon sorption characteristics of mandelic acid enantiomers on magnetic chiral sorbent were investigated. The sorption of mandelic acid enantiomers followed a pseudo-second-order reaction and equilibrium experiments were well fitted to a Langmuir isotherm model. The maximum adsorption capacity of racemic mandelic acid on to the magnetic chiral sorbent was found to be 405 mg g(-1). The magnetic chiral sorbent has a greater affinity for (S)-(+)-mandelic acid compared to (R)-(-)-mandelic acid. The optimum resolution was achieved with 10 mL 30 mM of racemic mandelic acid and 110 mg of magnetic chiral sorbent. The best percent enantiomeric excess values (up to 64%) were obtained by use of a chiralpak AD-H column.

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R_{L} = \frac{1}{1 + b C_{0}}

Section: Resultsmentioning

confidence: 99%

Enantioseparation of Mandelic Acid Enantiomers With Magnetic Nano‐Sorbent Modified by a Chiral Selector

Tarhan

Tural

et al. 2015

Chirality

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“…The absorption bands at 3449 cm -1 which appeared on all materials spectra is due to overlapping of the OH and N-H stretching vibration of functional groups engaged [14][15] in hydrogen bond [16]. The bands at 3264 and 3109 cm −1 which appeared on chitin spectrum only related to vibrational modes involved in intermolecular hydrogen bonding CO• • •HN and the intramolecular bonds of NH groups, respectively [17].…”

Section: Characterization Of Chitosanmentioning

confidence: 99%

Superparamagnetic Nanocomposite of Magnetite-Chitosan Using Oleic Acid as Anti Agglomeration and Glutaraldehyde as Crosslinkage Agent

et al. 2019

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In this research magnetite was synthesized by coprecipitation method, in which solution of NH4OH was added into the solution containing a mixture of Fe2+/Fe3+ (molar ratio 1:2) until pH 11 under strong ultrasonic agitation for 30 min. The black sediment of magnetite was filtered, washed and dried. The product was then modified by using oleic acid to prevent agglomeration. Chitosan was prepared by deacetilization of chitin, whereas chitin was extracted from shrimp shell. In the synthesis of nanocomposite, 0.5 g of chitosan and 1.5 g of oleic acid modified magnetite were introduced into 100 mL of 2% acetic acid solution, followed by sonication treatment for 10 min and magnetic stirring for 20 min. In order to perform the cross-linkage reaction, solution of 2% glutaraldehyde was added into the mixture at temperature of 40 °C for 3 h. The composite was collected by magnetic separation, followed by washing with distilled water and ethanol in a row. The product was dried and characterized by XRD, FTIR, TEM and VSM methods. The result showed that the composite had good crystal structure with a cubic inverse spinel structure, monodisperse and quasi sphere in shape with diameter of 20–25 nm. It had high saturation magnetization (43.4 emu/g) and superparamagnetic property.

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“…The D-R model given by Kumar et al (2010) was used to determine the mechanism of adsorption of 3-methyl-4nitrophenol onto CS-based nanofibres. The equations used to make the linear plots for the model are as follows:…”

Section: Mechanism Of Adsorptionmentioning

confidence: 99%

“…The adsorption mean-freeenergy E was used for this purpose. E is the free energy required to transfer 1 mol of the adsorbate from the solution to the surface of the adsorbent (Kumar et al, 2010). The magnitude of E is therefore used to estimate whether the interaction between the adsorbate and the adsorbent is physical or chemical.…”

Section: Mechanism Of Adsorptionmentioning

confidence: 99%

Electrospun chitosan-based nanofibres for removal of phenols from drinking water

Nthunya

Masheane

Malinga

et al. 2018

WSA

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Chitosan-based nanofibres were synthesized using a fibre electrospinning technique and tested for the removal of 3-methyl-4-nitrophenol from aqueous solutions. The downside of chitosan-based materials is swelling. In this study, it was found that the addition of polyisoprene not only improved the electrospinning ability of chitosan but also reduced the swelling of the nanofibres by 50%. The adsorption studies of 3-methyl-4-nitrophenol on the chitosan-based nanofibres were conducted in a batch process. The nanofibres were found to remove up to 90% of 3-methyl-4-nitrophenol with an adsorption reduction capacity of 12% at each cycle of reusability test. The reduction capacity was associated with the chemical interaction of the adsorbate and the adsorbent. This indicated that the nanofibres can effectively remove 3-methyl-4-nitrophenol from water for at least 3 cycles. The adsorption efficiency improved as the degree of cross-linking was reduced and the adsorption mechanism followed the Freundlich isotherm suggesting that the adsorption of 3-methyl-4-nitrophenol occurred in different layers on the surface of the nanofibres. The degree of crosslinking of the electrospun nanofibres with glutaraldehyde was found to affect theadsorption capacity. Nanofibres with different degrees of crosslinking were used to study the effect of pH, adsorbent dose, and initial concentration.

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Adsorption of Phenolic Compounds from Aqueous Solutions onto Chitosan-Coated Perlite Beads as Biosorbent

Cited by 57 publications

References 43 publications

Enantioseparation of Mandelic Acid Enantiomers With Magnetic Nano‐Sorbent Modified by a Chiral Selector

Enantioseparation of Mandelic Acid Enantiomers With Magnetic Nano‐Sorbent Modified by a Chiral Selector

Superparamagnetic Nanocomposite of Magnetite-Chitosan Using Oleic Acid as Anti Agglomeration and Glutaraldehyde as Crosslinkage Agent

Electrospun chitosan-based nanofibres for removal of phenols from drinking water

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