Iron(III) ion removal from solution through adsorption on chitosan

Abstract

ABSTRACT:The potential of different forms of chitosan to adsorb iron(III) ion from a Jectofer [an iron(III)-sorbitol-citric acid complex] solution was investigated. The working solution was chosen as Jectofer, to mimic the composition of excess iron(III) as may be found in biological systems. The equilibrium studies showed that chitosan powder has the highest sorption capacity for the iron(III) ion when compared to chitosan flakes and microspheres. The amount of iron(III) adsorbed onto chitosan was found to increase with the contact time to reach equilibrium within 3 h at 37°C. A higher initial concentration of a Jectofer solution resulted in a higher amount of iron(III) adsorbed. Higher pH values, in the range 2-7, also resulted in an increase in iron(III) uptake from the solution. The data of adsorption from the Jectofer solution were found to correlate well with the Freundlich isotherm equation. In vitro adsorption experiments showed that chitosan is capable of adsorbing excess iron, measured in terms of the ferritin level, in human blood.

Degradation of Acrylic Acid-Grafted Cellulose in Aqueous Medium With Radical Initiators

“…The capacity of chitosan to absorb iron (III) ion from an Jectofer, an Iron (III) -sorbitol -citric acid complex solution, was investigated. This, to mimic the composition of excess iron (III) as may be found in biological systems [37].…”

Study on chemical, UV and gamma radiation-induced grafting of 2-hydroxyethyl methacrylate onto chitosan

“…Due to its numerous and interesting biological properties such as biocompatibility, biodegradability and non-toxic properties, chitosan and its derivatives have become useful polysaccharides in biomedical and environmental areas (Luyen and Huong, 1996;Burke et al, 2002). However, in order to make the polymer adequate to each application, modifications on the chitosan structure are needed.…”

Adsorption of ferric ions onto natural feldspar: kinetic modeling and adsorption isotherm

“…The kinetics results of this study are compared with others values as listed in Table 3. Apparently, the pseudosecond-order model was found to be rate limiting, wherein the similar results have been observed using activated carbon (Edwin Vasu 2008), chitin (Karthikeyan et al 2005), chitosan (Burke et al 2002 andWan et al 2005 To determine the diffusibility of the Fe 3? ions into the pores of the adsorbent, Weber-Moris intraparticle diffusion model (Weber and Digiano 1996) was used in the form of the Eq.…”

“…The third portion is final equilibrium stage where the intraparticle diffusion starts to slow down due to extremely low solute concentrations in the solution and chemisorptions stage is taken part on the NF surface and pores (which already has been successfully explained by pseudosecond-order kinetic model from 5 to 120 min of adsorption period). (Burke et al 2002 andWan et al 2005) Film diffusion mass transfer rate is presented by Eq. 13: (Boyd et al 1947).…”

“…Therefore, adsorption onto natural solid adsorbent is reported to be the potential alternative technique to purify the aqueous system (Bernardo et al 2008;Tinschert et al 2000). Among these, adsorbents are activated carbon (Edwin Vasu 2008), chitin (Karthikeyan et al 2005), chitosan (Burke et al 2002 andWan et al 2005), egg shells (Yeddou and Bensmaili 2007), olive cakes (Al-Anber and Al-Anber 2008a), zeolite (AlAnber and Al-Anber 2008b), jojoba seeds , quartz and bentonite (Al-Anber 2010). Based on the these recent works, natural feldspar (NF) is considered one of the natural inorganic materials that show remarkable potential toward removing of toxic heavy metals from aqueous solutions.…”