Removal of Selected Metal Ions from Aqueous Solutions Using Chitosan Flakes

Bassi, R.; Prasher, Shiv O.; Simpson, Benjamin K.

doi:10.1081/ss-100100175

Cited by 195 publications

(106 citation statements)

References 20 publications

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“…The results obtained from the uptake of the metals throughout the study are in agreement with various results obtained with chitosan flakes that reported the same order of affinity for Cu 2+ and Cd 2+ . 59,60 It might be said that sorption of Cd 2+ and Ag + is less favorable, probably due to their larger ionic radii, the thing that might create a mismatch to the binding sites on chitosan.…”

Section: Resultsmentioning

confidence: 99%

Sorption Efficiency of Chitosan Nanofibers toward Metal Ions at Low Concentrations

et al. 2010

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Chitosan fibers showing narrow diameter distribution with a mean of 42 nm were produced by electrospinning and utilized for the sorption of Fe(III), Cu(II), Ag(I), and Cd(II) ions from aqueous solutions. The ion concentrations in the supernatant solutions were determined using inductively coupled plasma-mass spectrometry (ICP-MS). The filtration efficiency of the fibers toward these ions was studied by both batch and microcolumn methods. High efficiency in sorption of the metal ions was obtained in the both methods. The effects of sorbent amount (0.10-0.50 mg), shaking time (15-120 min), initial metal ion concentration (10.0-1000.0 µg · L -1 ), and temperature (25 and 50°C) on the extent of sorption were examined. The sorbent amount did not significantly alter the efficiency of sorption; however, shaking time, temperature, and metal ion concentration were found to have a strong influence on sorption. By virtue of its mechanical integrity, the applicability of the chitosan mat in solid phase extraction under continuous flow looks promising.

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Section: Resultsmentioning

confidence: 99%

Sorption Efficiency of Chitosan Nanofibers toward Metal Ions at Low Concentrations

et al. 2010

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“…In addition to the high adsorption capacity for various heavy metals (Bassi et al, 2000;Guibal, 2004), chitosan can easily form hydrogel (Zhao et al, 2007). Thus, chitosan may be a good carrier for immobilization of biomass.…”

Section: Introductionmentioning

confidence: 99%

Improvement of metal adsorption onto chitosan/Sargassum sp. composite sorbent by an innovative ion-imprint technology

et al. 2011

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Ion-imprinted chitosan Sargassum sp. a b s t r a c tTechnology for immobilization of biomass has attracted a great interest due to the high sorption capacity of biomass for sequestration of toxic metals from industrial effluents.However, the currently practiced immobilization methods normally reduce the metal sorption capacities. In this study, an innovative ion-imprint technology was developed to overcome the drawback. Copper ion was first imprinted onto the functional groups of chitosan that formed a pellet-typed sorbent through the granulation with Sargassum sp.; the imprinted copper ion was chemically detached from the sorbent, leading to the formation of a novel copper ion-imprinted chitosan/Sargassum sp. (CICS) composite adsorbent. The copper sorption on CICS was found to be highly pH-dependent and the maximum uptake capacity was achieved at pH 4.7e5.5. The adsorption isotherm study showed the maximum sorption capacity of CICS of 1.08 mmol/g, much higher than the non-imprinted chitosan/Sargassum sp. sorbent (NICS) (0.49 mmol/g). The used sorbent was reusable after being regenerated through desorption. The FTIR and XPS studies revealed that the greater sorption of heavy metal was attributed to the large number of primary amine groups available on the surfaces of the ion-imprinted chitosan and the abundant carboxyl groups on Sargassum sp.. Finally, an intraparticle surface diffusion controlled model well described the sorption history of the sorbents. ª 2010 Elsevier Ltd. All rights reserved. IntroductionBiosorption has been considered as a promising technology for the removal of low-level toxic metals from industrial effluents and natural waters (Volesky, 2007;Mehta and Gaur, 2005;Wang and Chen, 2009). Marine algae have received greater attention because of their high metal biosorption capacity, low cost, and renewable nature. They can effectively remove heavy metal ions with concentrations ranging from few ppm to several hundreds ppm. The maximum metal biosorption capacity ranging from 0.1 to 1.5 mmol/g biosorbent has been reported (Davis et al., 2003; Yang, 2005, 2006 A v a i l a b l e a t w w w . s c i e n c e d i r e c t . c o m j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / w a t r e s w a t e r r e s e a r c h 4 5 ( 2 0 1 1 ) 1 4 5 e1 5 40043-1354/$ e see front matter ª

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“…Among these natural materials, chitosan has been proved to be a suitable biopolymer for the removal of metal ions from aqueous solution [18][19][20][21] . Chitosan is chemically identical to cellulose except that the hydroxyl groups in the cellulose molecule are substituted with amino groups in chitosan.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

Jintakosol

Nitayaphat

2016

Mat. Res.

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Chitosan/montmorillonite (CTS-MMT) composite beads were used as adsorbents for the removal of silver ion (Ag + ) from aqueous solution. Equilibrium adsorption was achieved within 150 min at 3% MMT of chitosan solution. The optimum pH value for Ag + removal was found to be 6-7. The maximum adsorbent dosage for Ag + removal was 5 g/L. Under above maximum conditions the Ag + removal was 95.7%. The maximum adsorption capacities of CTS and CTS-MMT composite beads as obtained from Langmuir isotherm were found to be 38.46 and 43.48 mg/g, respectively. The adsorption kinetic agrees well with the pseudo second order model. The Ag + desorption of CTS-MMT composite bead was 17.39% at pH=4. SEM/EDX images confirm that after adsorption the Ag + were dispersed onto the composite bead surface. The adsorption and desorption experiment demonstrated that the CTS-MMT composite beads can be used as an effective adsorbents for removal of Ag + from aqueous solution.

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Removal of Selected Metal Ions from Aqueous Solutions Using Chitosan Flakes

Cited by 195 publications

References 20 publications

Sorption Efficiency of Chitosan Nanofibers toward Metal Ions at Low Concentrations

Sorption Efficiency of Chitosan Nanofibers toward Metal Ions at Low Concentrations

Improvement of metal adsorption onto chitosan/Sargassum sp. composite sorbent by an innovative ion-imprint technology

Adsorption of Silver (I) From Aqueous Solution Using Chitosan/Montmorillonite Composite Beads

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