Heavy metal biosorption by gellan gum gel beads

Lázaro, Nuria; Sevilla, Asunción López; Morales, Susana; Marqués, Ana

doi:10.1016/s0043-1354(02)00575-4

Cited by 66 publications

(37 citation statements)

References 20 publications

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“…Therefore, the heavy metal levels in water should be reduced below the maximum permissible concentration. The common methods used for removal of heavy metal ions from aqueous solutions include ion-exchange, solvent extraction, chemical precipitation, ultrafiltration, reverse osmosis, electrodialysis and adsorption (Blöcher et al 2003;Kryvoruchko et al 2004;Terashima et al 1986), among which adsorption is one of the important methods for the removal of heavy metals from the environment (Jeon and Park 2005;Lâzaro et al 2003;Saygideger et al 2005;Liu and Hui 2007).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of lead(II) from aqueous solution onto Hydrilla verticillata

et al. 2009

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The adsorption of Pb(II) onto Hydrilla verticillata was examined in aqueous solution with parameters of pH, adsorbent dosage, contact time and temperature. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms, and both models fitted well. The monolayer adsorption capacity of Pb(II) was found as 104.2 mg/g at pH 4 and 25 degrees C. Dubinin-Radushkevich (D-R) isotherm model was also applied to the equilibrium data. The mean free energy of adsorption (15.81 kJ/mol) indicated that the adsorption of Pb(II) onto H. verticillata may be carried out via chemical ion-exchange mechanism. Thermodynamic parameters, free energy (DeltaG (0)), enthalpy (DeltaH (0)) and entropy (DeltaS (0)) of adsorption were also calculated. These parameters showed that the adsorption of Pb(II) onto H. verticillata was a feasible, spontaneous and exothermic process in nature. The influence of Cd(2+), Cu(2+) and Ni(2+) on adsorption of Pb(2+) onto H. verticillata was studied, too. In the investigated range of operating conditions, it was found that the existence of Cd (2+), Cu (2+) and Ni (2+) had no impact on the adsorption of Pb(2+).

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Section: Introductionmentioning

confidence: 99%

Adsorption of lead(II) from aqueous solution onto Hydrilla verticillata

et al. 2009

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“…Entrapment in beads of calcium alginate gel is one of the most widely used techniques for immobilising bacteria (Scott et al, 1989), enzymes (Hussain et al, 1985), yeast (Bustard and McHale, 1997;Serp et al, 2000), algae (Crist et al,1994), animal cells (Lu et al, 2000). On the other hand, calcium alginate has been one of the most extensively investigated biopolymers for binding divalent heavy metals thus, it has been used for the removal of heavy metals from dilute aqueous solutions (Apel and Torma 1993;Araújo and Teixeira, 1997;Chen et al, 1997;Chen et al 1992;Ibañez and Umetsu, 2002;Jang et al, 1999;Lázaro et al, 2003;Veglio et al, 2002). Recently, the potential use of grape stalks wastes entrapped in calcium alginate beads for Cr(VI) removal from aqueous solutions has been studied.…”

Section: Introductionmentioning

confidence: 99%

Chromium (VI) uptake by grape stalks wastes encapsulated in calcium alginate beads: equilibrium and kinetics studies

Fiol

Poch

Villaescusa

2004

Chemical Speciation & Bioavailability

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“…6+ ion From the previous study done by other researcher [5], the intake of metals, q, isothermally is stated in the following equation below:…”

Section: The Intake Of Metal Ions (Q Values) For Crmentioning

confidence: 99%

“…Carrageenan (magnetic) are used in the process of separation (adsorption) for their low cost, their ability in reducing metal content in waste water (sewage), and they cause no toxic effects. The mechanism of metal cations involves formation of complex metal with metal ions and functional groups that are located on the surface or carrageenan pores [5]. In addition, carrageenan has shown that it is a good transport system and can facilitate in controlling pollution by heavy metals such as Pb, Cd, and Cr [6].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Physicochemical Evaluation of Biodegradable Magnetic Κ-Carrageenan Beads and Application for Chromium Ions Pre-Concentration

Nazarudin

Shamsuri

Shamsudin

2011

J. Chil. Chem. Soc.

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This study aims to examine the ability of magnetic Қ-carrageenan beads as an adsorbent in solid phase extraction towards chromium ions from aqueous solution. In this study, Қ-carrageenan magnetic gel-beads were obtained via interphase technique. The beads were kept in 0.3 M KCl to maintain gel strength. Physicochemical of the resulting materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and magnetometer. FTIR results have confirmed the presence of functional groups such as sulphate esters groups. The diameter of carrageenan beads was about ~764 μm where SEM micrographs showed the spherical formed shape of carrageenan beads and a rough surface with pores. The saturation magnetization value, M c , of carrageenan beads in this study was 18.78 EMU/g. The magnetic function of carrageenan beads is to facilitate bead collection and to get the Cr 6+ ion that adsorbed onto the beads. The adsorption of chromium ions by magnetic carrageenan beads are through an ion exchange mechanism and formation of metal-ligand complex. Optimal timing for adsorption of chromium ions was at 60th minute. The optimal operation conditions can be achieved on pH value~1 and concentration of 100 ppm. Langmuir adsorption isotherm curve for Cr 6+ is similar to Langmuir adsorption isotherm types III (unfavorable).

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Heavy metal biosorption by gellan gum gel beads

Cited by 66 publications

References 20 publications

Adsorption of lead(II) from aqueous solution onto Hydrilla verticillata

Adsorption of lead(II) from aqueous solution onto Hydrilla verticillata

Chromium (VI) uptake by grape stalks wastes encapsulated in calcium alginate beads: equilibrium and kinetics studies

Preparation and Physicochemical Evaluation of Biodegradable Magnetic Κ-Carrageenan Beads and Application for Chromium Ions Pre-Concentration

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