Thermodynamic properties of divalent cations complexed by ethylenesulfide immobilized on silica gel

Filha, Vera Lucia S. Augusto; Wanderley, Albaneide F.; Sousa, Kaline S.; Espı́nola, José G.P.; Fonseca, Maria G.; Arakaki, T.; Arakaki, Luiza N.H.

doi:10.1016/j.colsurfa.2005.12.041

Cited by 18 publications

(11 citation statements)

References 19 publications

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“…This value suggests a high thermodynamic stability for Cu(II) chelate on this surface. This result demonstrated that zinc ion interacts more effectively in binding to the pendant groups than other cations studied here [8]. The sorption data were also compared by the Freundlich equation in the following form, where q e is the equilibrium solute concentration on adsorbent (mmol g −1 ), C e is the equilibrium concentration of the solute (mmol dm −3 ), K F is the Freundlich constant (mmol g −1 ) which indicates the sorption capacity and represents the strength of the absorptive bond, and n is the heterogeneity factor which represents the bond distribution.…”

Section: Isotherm Studiesmentioning

confidence: 61%

“…Thus a covalent bond can be formed between the silica surface and the silylating agent to give a new modified silica surface with an anchored functionality. Then, it is possible to immobilize new molecules to increase the chain of the silylating agent with a variety of other organic functions even more active as chelating agents for many purposes [8].…”

Section: Introductionmentioning

confidence: 99%

“…Silica gel is a good solid support due to its thermal, chemical, and mechanical stability [6]. The silica surface consists of two types of functional groups, siloxane (Si-O-Si) and silanol (Si-OH) [7][8][9], which provide functionalization with different functional groups. Thus, silica modification can occur via the reaction of particular molecules with either the siloxane or the silanol [10].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, and sorption properties of silica gel-immobilized Schiff base derivative

Gübbük

Güp

Ersöz

2008

Journal of Colloid and Interface Science

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Section: Isotherm Studiesmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, characterization, and sorption properties of silica gel-immobilized Schiff base derivative

Gübbük

Güp

Ersöz

2008

Journal of Colloid and Interface Science

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“…Usually, the anchored molecules contain nitrogen, oxygen, or sulfur atoms, or a combination of them; they are acting as basic complexing groups. Their ''spatial arrangement,'' in the best cases, allows these resins to have interesting selective extraction properties [35].…”

Section: Introductionmentioning

confidence: 99%

Dy(III) recovery from dilute solutions using magnetic-chitosan nano-based particles grafted with amino acids

et al. 2015

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Magnetic-chitosan nano-based particles were successfully prepared by a simple one-pot co-precipitation method before being functionalized with three different amino acid groups (i.e., alanine, serine, and cysteine) using epichlorohydrin as the linking agent. The structural and functional characteristics of the nanosorbents were investigated by elemental analysis, Fourier transform infrared spectrometer, X-ray diffraction, TEM, and vibrating sample magnetometry. The sorption properties of these materials were tested for Dy(III) recovery from aqueous solution: pH effect, uptake kinetics, and sorption isotherms were investigated. Sorbent particles are super-paramagnetic and their size is in the range of 15-40 nm. Kinetic profiles are successfully modeled with the pseudo secondorder rate equation. The Langmuir and the Dubinin-Radushkevich equations fit well-sorption isotherms. The maximum sorption capacities at pH 5 (optimum pH, and at T: 27 ± 1°C) are close to 14.8, 8.9, and 17.6 mg Dy g -1 for alanine, serine, and cysteine type, respectively. Cationic species RE(III) in aqueous solution appear to be sorbed by combined chelation and anion-exchange mechanisms. The sorption process begins at low-metal concentration by a physical monolayer sorption at low ion concentration before metal ions can be sorbed at higher metal concentration by coordination. The values of the thermodynamic parameters DG°and DH°indicate the spontaneous and endothermic nature of the mechanism, while the positive values of DS°show that during the sorption process the randomness increases. Finally, the sorbent can be efficiently regenerated using acidified thiourea: the amount of Dy(III) sorbed is hardly reduced, at least during the first four sorption/desorption cycles.

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“…One of their works is silica modification with active sites containing donor atom as a function of ligand derived from synthesis compounds or natural product like fungi, algae or other biomass from agro industrial waste in increasing of adsorption capacity of materials upon metal ions [4][5][6][7][8][9]. In addition, improving of chemical stability and adsorption selectivity is also very important of these materials.…”

Section: Introductionmentioning

confidence: 99%

CHEMICAL STABILITY AND ADSORPTION SELECTIVITY ON Cd<sup>2+</sup> IONIC IMPRINTED <i>Nannochloropsis</i> sp MATERIAL WITH SILICA MATRIX FROM TETRAETHYL ORTHOSILICATE

Buhani¹,

Suharso²,

Aprilia³

2012

Indones. J. Chem.

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Keywords: ionic imprinted; Nannochloropsis sp; adsorption selectivity ABSTRAK Stabiltas kimia, kemampuan penggunaan ulang, dan selektivitas adsorpsi material Nannochloropsis sp imprinted ionik Cd 2+ (Cd(II)-IIP) dengan matriks silika dari prekursos tetraetil orthosilikat (TEOS) telah dipelajari melalui serangkaian eksperimen adsorpsi dengan metoda batch. Material Nannochloropsis sp Cd(II)-IIP dikarakterisasi dengan spektrofotometer inframerah (IR) untuk identifikasi gugus fungsi dan analisis kadar logam dengan spektrofotometer serapan atom (AAS). Stabilitas kimia ditentukan dalam media larutan asam, netral dan basa. Selektivitas adsorpsi diketahui dengan menentukan koefisien selektifitas (α) ion 0,887; 20,180; 28,053; 33,417.

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Thermodynamic properties of divalent cations complexed by ethylenesulfide immobilized on silica gel

Cited by 18 publications

References 19 publications

Synthesis, characterization, and sorption properties of silica gel-immobilized Schiff base derivative

Synthesis, characterization, and sorption properties of silica gel-immobilized Schiff base derivative

Dy(III) recovery from dilute solutions using magnetic-chitosan nano-based particles grafted with amino acids

CHEMICAL STABILITY AND ADSORPTION SELECTIVITY ON Cd<sup>2+</sup> IONIC IMPRINTED <i>Nannochloropsis</i> sp MATERIAL WITH SILICA MATRIX FROM TETRAETHYL ORTHOSILICATE

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