Intraparticle diffusion processes during acid dye adsorption onto chitosan

Cheung, Waiman; Szeto, Yau Shan; McKay, Gordon

doi:10.1016/j.biortech.2006.09.045

Cited by 879 publications

(373 citation statements)

References 27 publications

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“…34 On chitosan, adsorption of dye molecules is proposed to take place in two steps: first the dye is transferred from the solution to the surface; the last stage is related to the diffusion of the dye within the pores of the material, binding the pores and capillary spaces. 35 These processes seem to be very fast with the dyes here studied. The pK a for chitosan is near to 6.3, so the anion dye sorption through exchange of ions is favored at low pH values.…”

Section: Adsorption Isothermsmentioning

confidence: 81%

“…Contrary to Alizarin the kind of structure of Eriochrome Blue Black R makes difficult the intraparticle diffusion in chitosan. 35 A low affinity of these dyes for the iron oxides is observed. The amount of Alizarin adsorbed on goethite decreases slightly in the pH range studied with the increase of the pH (0.19 to 0.17 mmol dye/g adsorbent).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Elimination of dyes from aqueous solutions using iron oxides and chitosan as adsorbents: a comparative study

Pirillo¹,

Pedroni²,

Rueda³

et al. 2009

Quím. Nova

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Recebido em 5/9/08; aceito em 4/12/08; publicado na web em 7/5/09This work investigates the adsorption of Alizarin, Eriochrome Blue Black R and Fluorescein using chitosan, goethite and magnetite as adsorbents. For Alizarin, the best adsorbent is chitosan with a Langmuir parameter of 15.8 mmol dye/g adsorbent. For Eriochrome Blue Black R only 1.94 mmol dye/g chitosan is adsorbed. Langmuir parameters for the Alizarin adsorption on both iron oxides display one or two orders of magnitude lower than for chitosan and two orders of magnitude lower in the case of Eriochrome Blue Black R. Fluorescein does not adsorb in appreciable amounts on chitosan and it presents the lower affinity on the iron oxides.

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Section: Adsorption Isothermsmentioning

confidence: 81%

Section: Adsorption Isothermsmentioning

confidence: 99%

Elimination of dyes from aqueous solutions using iron oxides and chitosan as adsorbents: a comparative study

Pirillo¹,

Pedroni²,

Rueda³

et al. 2009

Quím. Nova

View full text Add to dashboard Cite

show abstract

“…Secondly is the adsorption process at individual site on the surface (internal or external) and the energy depends on the binding process (physical or chemical adsorption) this step is often assumed to be extremely rapid. Finally, diffusion of the adsorbate molecules to an adsorption site either by a pore diffusion process through the liquid filled pores or by a solid surface diffusion mechanism [32]. One or any combination of this adsorption process could be the rate-controlling mechanism.…”

Section: E Adsorption Kineticsmentioning

confidence: 99%

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Rozaini¹,

Jain²,

Oo³

et al. 2010

IJCEA

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Abstract-Mangrove barks Rhizophora apiculata which have been chemically modified in basic condition were used as adsorbent for the removal of nickel and copper ions from aqueous solution. The adsorbent was characterized by SEM images, FT-IR and BET analysis. Effecting parameters like initial pH, initial concentrations of metal ions and contact time were investigated. The adsorption data were well fitted by Freundlich isotherm model. Kinetic data were best described by pseudo-second-order model. Thermodynamic studies showed spontaneous and exothermic nature in the adsorption of Ni(II) and Cu(II) ions by the modified mangrove barks.

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“…Chitosan (CHT), a deacetylated derivative of chitin, has numerous applications in different fields including photography [5], metal capture from waste water (Hg 2+ , Cr 3+ ) [6][7][8], and acid dye sorption [9]. The low cost of CHT compared with commercial activated carbon as well as its possible biodegradability made it suitable for removal of heavy metals from industrial effluent [10].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

Biswas

Rashid

Mallik

et al. 2017

International Journal of Polymer Science

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A novel composite material was prepared from prawn shell derived chitosan (CHT) and locally available kaolinite-rich modified Bijoypur clay (MC) using a facile technique in which dilute acetic acid was used as a solvent for dissolving chitosan and composite fabrication whereas distilled water was used for preparing the clay dispersion. Bijoypur clay mainly consists of kaolinite clay mineral and it was modified with the dodecyl amine to make it organophilic. Morphology and properties of the composites (different weight ratio of MC and CHT) have been studied and compared with those of pure CHT and MC. Purification and modification of Bijoypur clay were investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), and Fourier transformed infrared spectroscopy (FTIR) analyses. The fabrication of CHT-MC composites was confirmed by FTIR analysis. Thermogravimetric analysis (TGA) and differential scanning colorimetry (DSC) were used to investigate the thermal stability of the composites. It was observed that dispersed clay improves the thermal stability and enhances the hardness of the matrix systematically with the increase of clay loading. In this study, a better insolubility in both acidic and alkaline media of the composites is also observed compared to pure chitosan.

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Intraparticle diffusion processes during acid dye adsorption onto chitosan

Cited by 879 publications

References 27 publications

Elimination of dyes from aqueous solutions using iron oxides and chitosan as adsorbents: a comparative study

Elimination of dyes from aqueous solutions using iron oxides and chitosan as adsorbents: a comparative study

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Facile Preparation of Biocomposite from Prawn Shell Derived Chitosan and Kaolinite-Rich Locally Available Clay

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