Adsorption equilibria of reactive dye onto highly polyaminated porous chitosan beads

Kim, Tae Young; Cho, Sung Yong

doi:10.1007/bf02705784

Cited by 33 publications

(15 citation statements)

References 13 publications

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“…This indicates that acidic medium may not favour Cd 2+ adsorption, but basic medium either through addition of hydroxyl ions [OH − ] will increase adsorption of Cd 2+ . This phenomenon of higher adsorption in basic medium can be attributed to more charges, disassociation of more anions which will attract Cd 2+ , higher attraction forces and formation of Cd[OH] 2 which will precipitate as a product from the reaction Nam et al, 2001;Shun et al, 2001;Ho et al, , 2004Kim and Cho, 2005). components are present in the system, the adsorption kinetics are the essential ingredients for an understanding of how much of those components can be accommodated by a solid adsorbent.…”

Section: Ion Exchange Modelmentioning

confidence: 99%

Adsorption kinetics of cadmium ions onto powdered corn cobs

et al. 2009

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Environmental pollution caused by the presence of toxic materials such as cadmium is becoming global problem and concern. This paper presents a report on kinetics of Cd 2+ removal from aqueous solutions through adsorption using powdered corn cobs (PCC). Corn cobs were collected from a selected location, washed to remove sand, air dried, ground and sieved into different particle sizes. The selected properties of PCC were determined using acid digestion method. Adsorption capacities through kinetics of Cd 2+ removal from synthetic solutions, typical raw water and domestic-institutional wastewater were studied. Effects of pH, PCC particle size, initial concentration of Cd 2+ and temperature on adsorption capacities were monitored through pseudo first-and second-order models, Elovich and intraparticle diffusion models to present adsorption rate parameters.The study revealed that PCC contained 86.89% volatile solids, had 4.56% acid solubility, 0.52 water solubility and 2.33% ash content. PCC removed Cd 2+ from aqueous solutions (synthetic, raw water, and wastewater). The relationship between time and concentration of Cd 2+ remaining in the solution followed exponential functions with squared correlation coefficient ranging from 0.9928 to 0.9993, 0.8701 to 0.9284, and 0.8514 to 0.9290 for synthetic solution, raw water, and typical domestic-institutional wastewater, respectively. Mechanism of cadmium adsorption onto PCC was in two separate stages linear portions in the first parts, while the final parts are curves indicating intraparticle diffusion. It was concluded that PCC is an effective adsorbent for Cd 2+ removal. The estimated production cost was 0.068 USD as against 0.50, 2.12, and 3.12 USD for producing adsorbents from empty fruit bunches; pencom shell and sugar cane based activated carbons, respectively.Cet article présente un rapport sur la cinétique du retrait du Cd2+ de solutions aqueuses par adsorption en utilisant de la rafle de maïs en poudre (RMP). Lesépis de maïs ontété collectésà partir d'un lieu sélectionné, lavés pouréliminer le sable, séchésà l'air, broyés et tamisés en particules de différentes tailles. Les propriétés sélectionnées de la RMP ontété déterminées en utilisant la méthode de la digestion acide. On aétudié les capacités d'adsorption par la cinétique du retrait du Cd2+ de solutions synthétiques, d'eaux brutes non traitées et d'eaux usées ménagères-institutionnelles. Les effets du pH, de la taille des particules de RMP, de la concentration initiale de Cd2+ et de la température sur les capacités d'adsorption ontété suivis par des modèles de pseudo-cinétique de premier ordre et de second ordre, Elovich et des modèles de diffusion intra-particule pour présenter des paramètres de taux d'adsorption. L'étude révèle que la RMP contenait 86,889% de solides volatils, avait une solubilité dans l'acide de 4,56%, une solubilité dans l'eau de 0,52 et une teneur en cendres de 2,331%. La RMP permettait de retirer le Cd2+ des solutions aqueuses (synthétiques, eau brute et eaux usées). La relation entre le...

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Section: Ion Exchange Modelmentioning

confidence: 99%

Adsorption kinetics of cadmium ions onto powdered corn cobs

et al. 2009

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“…It has been widely used in pharmaceutical and medical areas to deliver therapeutic peptide, protein, oligonucleotide, and genes because it has biocompatibility and low toxicity. Chitosan nanoparticles were prepared by various methods such as chemical cross-linking [1,2], ionic cross-linking [3], emulsion droplet coalescence [4] reverse micellar [5], and self assembly chemical modification [6]. The disadvantages of some methods are undesirable effects of cross-linking agent, more solvent and high energy consumption for chemical cross-linking, and reverse micellar, respectively.…”

Section: Introductionmentioning

confidence: 99%

Preparation of chitosan nanoparticles for encapsulation and release of protein

Jarudilokkul

Tongthammachat

Boonamnuayvittaya

2011

Korean J. Chem. Eng.

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Chitosan nanoparticles were prepared by ionic cross-linking with tripolyphosphate (TPP). The major effect on encapsulation and release of protein in chitosan-TPP nanoparticles was investigated in order to control the loading and release efficiency. A set of the same molecular weight (MW) proteins with different pI and a set of the same pI proteins with different MW were studied. The influence of protein concentration, pH of solution, and the activity of released protein were examined. It was found that the encapsulation efficiency (EE) of a set of the different MW protein decreased with increasing of MW of protein and protein concentration. The protein with having pI higher than pH of solution was attracted to the positively charged chitosan, resulting in increasing of EE. The release of protein from the nanoparticles showed that the protein release decreased with increasing of chitosan concentration, high MW protein, low pH, and less swelling of the particle. The released protein in chitosan-TPP matrix was still active in the buffer solution.

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“…CS derivative formed by grafting reactions was made mainly to enhance the density of reactive amine groups [14][15][16] or to improve its adsorption selectivity for adsorbates [17,18]. In this study, CS hydrogel beads formed by alkali gelation [19], and by SDS gelation [10], and their polyethyleneimine (PEI)-grafted derivatives were used for the adsorption of Reactive Black 5 (RB5), a model anionic dye, from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%