Mercury(II) removal from aqueous solution by sorption onto alginate, pectateand polygalacturonate calcium gel beads. A kinetic and speciation basedequilibrium study

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Abstract

Gel beads of calcium alginate, pectate and polygalacturonate salts have been tested as sorbent materials for mercury(II) removal from aqueous solutions. Physico-chemical properties of gel beads, defined bySEM–EDX, TGA and texture and density analysis, were correlated with gel beads sorption capacity towards Hg2+ ion. A speciation study in aqueous solution was carried out to define the strength of interaction of mercury ion with the polymers investigated and to assess the more suitable experimental conditions to achieve the best effectiveness of Hg2+ sorption by gel beads. On the basis of the speciation study, pH values in the 3–5.5 pH range were considered appropriated for mercury(II) sorption by gelbeads. Kinetics of mercury(II) sorption and calcium(II) release from the sorbent materials were studied at pH 3, 3.6 and 5.2. The highest sorption rate (K) and amount of mercury(II) adsorbed were obtained at pH 3 and 3.6; therefore, pH 3.3 was chosen for the equilibrium study of Hg2+ sorption at 25 C. The results obtained by using Langmuir and Freundlich isotherm equations show the following sorption capacity trend: Ca–Pect > Ca–PGA > Ca–AA.
Lingua originaleEnglish
pagine (da-a)207-217
Numero di pagine11
RivistaREACTIVE & FUNCTIONAL POLYMERS
Volume73
Stato di pubblicazionePublished - 2013

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alginate
Alginate
Mercury
Sorption
Calcium
Gels
aqueous solution
gel
sorption
calcium
kinetics
Kinetics
Sorbents
Ions
ion
Polymers
Salts
removal
mercury
alginic acid

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Biochemistry
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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title = "Mercury(II) removal from aqueous solution by sorption onto alginate, pectateand polygalacturonate calcium gel beads. A kinetic and speciation basedequilibrium study",
abstract = "Gel beads of calcium alginate, pectate and polygalacturonate salts have been tested as sorbent materials for mercury(II) removal from aqueous solutions. Physico-chemical properties of gel beads, defined bySEM–EDX, TGA and texture and density analysis, were correlated with gel beads sorption capacity towards Hg2+ ion. A speciation study in aqueous solution was carried out to define the strength of interaction of mercury ion with the polymers investigated and to assess the more suitable experimental conditions to achieve the best effectiveness of Hg2+ sorption by gel beads. On the basis of the speciation study, pH values in the 3–5.5 pH range were considered appropriated for mercury(II) sorption by gelbeads. Kinetics of mercury(II) sorption and calcium(II) release from the sorbent materials were studied at pH 3, 3.6 and 5.2. The highest sorption rate (K) and amount of mercury(II) adsorbed were obtained at pH 3 and 3.6; therefore, pH 3.3 was chosen for the equilibrium study of Hg2+ sorption at 25 C. The results obtained by using Langmuir and Freundlich isotherm equations show the following sorption capacity trend: Ca–Pect > Ca–PGA > Ca–AA.",
author = "Alberto Pettignano and Salvatore Cataldo and Antonio Gianguzza and Isabel Villaescusa",
year = "2013",
language = "English",
volume = "73",
pages = "207--217",
journal = "REACTIVE & FUNCTIONAL POLYMERS",
issn = "1381-5148",

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TY - JOUR

T1 - Mercury(II) removal from aqueous solution by sorption onto alginate, pectateand polygalacturonate calcium gel beads. A kinetic and speciation basedequilibrium study

AU - Pettignano, Alberto

AU - Cataldo, Salvatore

AU - Gianguzza, Antonio

AU - Villaescusa, Isabel

PY - 2013

Y1 - 2013

N2 - Gel beads of calcium alginate, pectate and polygalacturonate salts have been tested as sorbent materials for mercury(II) removal from aqueous solutions. Physico-chemical properties of gel beads, defined bySEM–EDX, TGA and texture and density analysis, were correlated with gel beads sorption capacity towards Hg2+ ion. A speciation study in aqueous solution was carried out to define the strength of interaction of mercury ion with the polymers investigated and to assess the more suitable experimental conditions to achieve the best effectiveness of Hg2+ sorption by gel beads. On the basis of the speciation study, pH values in the 3–5.5 pH range were considered appropriated for mercury(II) sorption by gelbeads. Kinetics of mercury(II) sorption and calcium(II) release from the sorbent materials were studied at pH 3, 3.6 and 5.2. The highest sorption rate (K) and amount of mercury(II) adsorbed were obtained at pH 3 and 3.6; therefore, pH 3.3 was chosen for the equilibrium study of Hg2+ sorption at 25 C. The results obtained by using Langmuir and Freundlich isotherm equations show the following sorption capacity trend: Ca–Pect > Ca–PGA > Ca–AA.

AB - Gel beads of calcium alginate, pectate and polygalacturonate salts have been tested as sorbent materials for mercury(II) removal from aqueous solutions. Physico-chemical properties of gel beads, defined bySEM–EDX, TGA and texture and density analysis, were correlated with gel beads sorption capacity towards Hg2+ ion. A speciation study in aqueous solution was carried out to define the strength of interaction of mercury ion with the polymers investigated and to assess the more suitable experimental conditions to achieve the best effectiveness of Hg2+ sorption by gel beads. On the basis of the speciation study, pH values in the 3–5.5 pH range were considered appropriated for mercury(II) sorption by gelbeads. Kinetics of mercury(II) sorption and calcium(II) release from the sorbent materials were studied at pH 3, 3.6 and 5.2. The highest sorption rate (K) and amount of mercury(II) adsorbed were obtained at pH 3 and 3.6; therefore, pH 3.3 was chosen for the equilibrium study of Hg2+ sorption at 25 C. The results obtained by using Langmuir and Freundlich isotherm equations show the following sorption capacity trend: Ca–Pect > Ca–PGA > Ca–AA.

UR - http://hdl.handle.net/10447/68363

UR - http://www.sciencedirect.com/science/article/pii/S1381514812002684

M3 - Article

VL - 73

SP - 207

EP - 217

JO - REACTIVE & FUNCTIONAL POLYMERS

JF - REACTIVE & FUNCTIONAL POLYMERS

SN - 1381-5148

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