Mercury sorption on a thiocarbamoyl derivative of chitosan

Gavilan, K. Campos; Пестов, А. В.; García, Holger Maldonado; Yatluk, Yu. G.; Roussy, J.; Guibal, Eric

doi:10.1016/j.jhazmat.2008.10.005

Cited by 62 publications

(41 citation statements)

References 71 publications

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“…Raw (pristine) chitosan membranes were cross-linked heterogeneously by immersion in a 0.75 w/w% aqueous glutaraldehyde (GLA) solution (3.0 g of wet chitosan membrane in 50 m of GLA solution) without agitation at room temperature for 2 h, followed by rinsing with de-ionized water to remove any unreacted GLA residue (Hsien and Rorrer 1995). For cross-linking with epichlorohydrin (ECH), the process consisted of immersing 3.0 g of wet raw chitosan membranes in a 0.01 mol/ ECH solution (prepared in 0.067 mol/ NaOH solution) at 313 K under continuous agitation for 2 h (Wei et al 1992).…”

Section: Preparation and Chemical Modification Of Chitosan Membranesmentioning

confidence: 99%

“…Finally, the membranes were rinsed with de-ionized water to remove unreacted ECH. In this study, chitosan/GLA and chitosan/ECH molar ratios of 5.0 and 0.2 were used, respectively, in accordance with studies by Hsien and Rorrer (1995) and Wei et al (1992).…”

Section: Preparation and Chemical Modification Of Chitosan Membranesmentioning

confidence: 99%

“…Heavy metal ions are highly toxic at low concentrations and can accumulate in living organisms, causing several disorders and diseases (Gotoh et al 2004). The removal of heavy metal ions from industrial effluents has become a great challenge due to the increasing requirements of environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan is a hydrophilic, non-toxic, biodegradable and biocompatible material that has a strong affinity for metal ions (Guibal 2004). This ability arises from the presence of amine and hydroxyl groups on the chitosan chain.…”

Section: Introductionmentioning

confidence: 99%

“…Account should be taken of the fact that cross-linking can reduce the adsorption capacity, especially in the case of chemical reactions involving amine groups, although this loss may be necessary to ensure polymer stability (Miretzky and Cirelli 2009;Bailey et al 1999;Dzul Erosa et al 2001). Depending on the functional groups introduced by the cross-linking agent, the adsorption capacity may increase since the cross-linking process can enlarge the space between chitosan chains, thereby improving the accessibility of amino groups to metal ions (Hsien and Rorrer 1995).…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Copper(II) and Mercury(II) Ions onto Chemically-Modified Chitosan Membranes: Equilibrium and Kinetic Properties

Rabelo

Vieira

Luna

et al. 2012

Adsorption Science & Technology

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Cross-linked chitosan was synthesized with glutaraldehyde (chitosan-GLA) and epichlorohydrin (chitosan-ECH). The structures of these matrices were characterized by elemental analysis, Fourier-transform infrared spectrometry (FT-IR), the degree of de-acetylation and the surface topography as determined via scanning electron microscopy (SEM). After promoting interaction with the metal ion, the adsorbent was also studied using FT-IR and energy dispersive X-ray spectroscopy (EDXS). Adsorption studies for Cu(II) and Hg(II) ions were carried out in a batch process. The adsorption kinetics were tested using three models, viz. pseudo-first-order, pseudo-second-order and intra-particle diffusion. The experimental kinetic data were best fitted by the pseudo-second-order model for Cu(II) ions (R 2 ≥ 0.98) and for Hg(II) ions (R 2 = 0.99). Higher rate constants (k 2 ) were obtained for the adsorption of Cu(II) ions onto chitosan-GLA [1.40 g/(mmol h)] and for Hg(II) ions onto raw chitosan [5.65 g/(mmol h)]. The adsorption rate depended on the concentration of Cu(II) and Hg(II) ions on the adsorbent surface and on the quantity of ions adsorbed at equilibrium. At 293 K, the Langmuir-Freundlich model provided a better fit to the adsorption isotherms on both raw and cross-linked chitosan membranes. The maximum adsorption capacity for Cu(II) ions was obtained with the chitosan-GLA matrix (2.7 mmol/g). A maximum adsorption capacity of 3.1 mmol/g was attained for Hg(II) ions onto the chitosan-ECH matrix.

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Section: Preparation and Chemical Modification Of Chitosan Membranesmentioning

confidence: 99%

Section: Preparation and Chemical Modification Of Chitosan Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of Copper(II) and Mercury(II) Ions onto Chemically-Modified Chitosan Membranes: Equilibrium and Kinetic Properties

Rabelo

Vieira

Luna

et al. 2012

Adsorption Science & Technology

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A Fluorescent Metal–Organic Framework for Food Real‐Time Visual Monitoring

Wang

et al. 2021

Advanced Materials

195

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Due to increasing food‐safety issues, exploiting efficient approaches for food quality assessment and instrumentation has attracted concerns worldwide. Herein, a smart evaluation system based on a fluorescent metal–organic framework (MOF) is developed for real‐time visual monitoring of food freshness. Via post‐synthetic modification, a ratiometric fluorescent MOF probe is constructed by covalently coupling fluorescein 5‐isothiocyanate (5‐FITC) with NH2‐rich lanthanide MOF. The probes exhibit a dual‐emissive‐responsive to biogenic amine, resulting in an increase in FITC emission along with a decrease in Eu3+ emission accompanied by a clear distinguishable color transition from orange red to green. After doping the probes on a flexible substrate, the obtained MOF composite film can be integrated with a smartphone‐based portable platform easily. It is proved that this smart evaluation system can be used for on‐site inspection of the freshness of raw fish samples. This work develops a fluorescent MOF‐based smart evaluation system as a novel platform for application in food monitoring, which not only has enormous economic value but also holds great public health significance.

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Palladium and platinum sorption on a thiocarbamoyl‐derivative of chitosan

Butewicz

Gavilan

Пестов

et al. 2010

J of Applied Polymer Sci

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Immobilizing thiourea onto chitosan allowed using the polymer for the recovery of platinum groups metals (PGMs) in acidic solutions (up to 1-2M HCl concentrations). At low HCl concentration protonated amine groups may sorb chloroanionic metal species (electrostatic attraction mechanism); however, most of sorption proceeds through chelation on sulfur containing groups (less sensitive to acidic conditions). The bi-site Langmuir equation was used for fitting sorption isotherms. The sorption of PGMs was weakly affected by the composition of the solution (presence of high concentration of anions and base metals). Maximum sorption capacities for Pd(II) and Pt(IV) ranged between 274 and 330 mg g À1 in 0.25M HCl solutions and decreased to 150-198 mg g À1 in 2M HCl solutions: Pd(II) sorption was systematically higher than Pt(IV) sorption. The pseudo-second rate equation was used for modeling the uptake kinetics. Agitation speed hardly affected uptake kinetics indicating that external diffusion resistance is not the rate controlling step. Desorption yield higher than 85% were obtained using thiourea in 0.1M HCl solution. The adsorbents could be reused for at least three cycles.

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Mercury sorption on a thiocarbamoyl derivative of chitosan

Cited by 62 publications

References 71 publications

Adsorption of Copper(II) and Mercury(II) Ions onto Chemically-Modified Chitosan Membranes: Equilibrium and Kinetic Properties

Adsorption of Copper(II) and Mercury(II) Ions onto Chemically-Modified Chitosan Membranes: Equilibrium and Kinetic Properties

A Fluorescent Metal–Organic Framework for Food Real‐Time Visual Monitoring

Palladium and platinum sorption on a thiocarbamoyl‐derivative of chitosan

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