Sol-gel materials for the solid phase extraction of metals from aqueous solution

Seneviratne, Janaki; Cox, James A.

doi:10.1016/s0039-9140(00)00422-7

Cited by 46 publications

(11 citation statements)

References 15 publications

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“…It had been reported that Chang et al used a surface imprinting technique for selective solid-phase extraction of Ni 2+ [8]. Solid-phase extraction is today the most popular method for pre-concentration and recovery of valuable metals [9][10][11]. Development of novel solid adsorbents for recovery of these valuable metals from aqueous solution is thus of great importance.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-g-poly(acrylic acid) hydrogel with crosslinked polymeric networks for Ni2+ recovery

Zheng¹,

Huang²,

Wang³

2011

Analytica Chimica Acta

111

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Section: Introductionmentioning

confidence: 99%

Chitosan-g-poly(acrylic acid) hydrogel with crosslinked polymeric networks for Ni2+ recovery

Zheng¹,

Huang²,

Wang³

2011

Analytica Chimica Acta

111

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“…Materials made of immobilized reagents in polymeric matrixes have emerged in many fields of chemistry, including heterogeneous catalysis and green chemistry, separation sciences and remediation processes, electrochemistry and sensors, or supramolecular devices , that can be quite easily prepared with a tailor-made structure by means of the versatile sol−gel technique, , with a specific chemical reactivity that can be tuned by the choice of appropriate organofunctional groups …”

Section: Introductionmentioning

confidence: 99%

Rate of Access to the Binding Sites in Organically Modified Silicates. 1. Amorphous Silica Gels Grafted with Amine or Thiol Groups

2002

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The speed at which selected reactants are reaching active sites grafted on porous silica gels of various nature and porosity was evaluated using some model systems: protonation of aminopropyl-grafted silica (APS), mercury(II) binding on mercaptopropyl-grafted silica (MPS), and accumulation of copper(II) on APS. Data were obtained from batch experiments, by monitoring the consumption of reactant in solutions containing the solid phases as dispersed particles (average size: 60−150 μm). Various grafted solids were studied, with pore diameter ranging between 4 and 15 nm and organic group contents of typically 1.4−1.9 mmol g-1. Diffusion processes in the porous organically modified silicas were found to be dramatically restricted as compared to those observed in homogeneous solution (≈103−104 times slower). They were dependent on several factors such as the pore size of the material and the size of the reactant, the density of grafted organic sites, and the nature of the starting silica gel. Evaluation of apparent diffusion coefficients was achieved by applying a simplified model based on spherical diffusion. This has allowed us to point out a significant decrease in the access rates upon gradual completion of reactions: as the reactant concentration in the vicinity of increasing amounts of grafted groups is raised progressively, there is less room available in the porous structure to enable the probe to reach rapidly the remaining active sites. The apparent diffusion coefficient was found to drop dramatically after typically 30−50% reaction completion, depending on the nature of the probe. This study allows highlighting the optimal conditions that should be required to ensure efficient application of grafted silica gels, that is, in the fields of catalysis or heavy metal extraction.

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“…Therefore, this method has been widely used as pre-treatment of several instrumental analyses. Various functional materials, such as the ion-exchange resin (Hasegawa et al 2003), chelate resin (Lee et al 2002), silica monolith made by sol-gel method (Seneviratne and Cox 2000), polytetrafluoroethylene (PTFE) fiber (Abe et al 2006), a molecule recognition agent from highly selective resin composed of macrocyclic compound, such as crown ether (Rahman et al 2013), have been developed. In the case of the environmental water analysis, solid phase extraction method has been adopted for some substance by Ministry of the Environment, Japan.…”

Section: Assessment Of Heavy-metals In Polluted Soilmentioning

confidence: 99%

Immobilization of Fluoride and Heavy-Metals in Polluted Soil

Tafu

Manaka

2016

Environmental Remediation Technologies for Metal-Contaminated Soils

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Estimation and immobilization of fluoride and heavy-metals in contaminated soil are important approaches for the remediation of fluoride and heavymetal polluted soil. In this review, firstly, we described recent achievements about the on-site estimation of various pollutants by simple chemical reaction without special skills for operators. The in-situ immobilization of fluoride was also described. For immobilization of fluoride, dicalcium phosphate dihydrate (DCPD) was selected as functional material because it reacts with fluoride ion effectively and forms stable fluorapatite (FAp). Both laboratory and field tests showed that the DCPD is useful to immobilize fluoride in polluted soil.

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Sol-gel materials for the solid phase extraction of metals from aqueous solution

Cited by 46 publications

References 15 publications

Chitosan-g-poly(acrylic acid) hydrogel with crosslinked polymeric networks for Ni2+ recovery

Chitosan-g-poly(acrylic acid) hydrogel with crosslinked polymeric networks for Ni2+ recovery

Rate of Access to the Binding Sites in Organically Modified Silicates. 1. Amorphous Silica Gels Grafted with Amine or Thiol Groups

Immobilization of Fluoride and Heavy-Metals in Polluted Soil

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