Some insights into the chemistry of gold adsorption by thiol and amine functionalized mesoporous silica in simulated thiosulfate system

Fotoohi, Babak; Mercier, Louis

doi:10.1016/j.hydromet.2015.05.010

Cited by 49 publications

(38 citation statements)

References 52 publications

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“…Bahsedilen zorlukları aşmak için uygun fonksiyonel grup içeren polimer adsorbanın seçimi önem arz etmektedir. Bu bağlamda, primer, sekonder ve tersiyer amin grubu içeren polimerler değişik değerli metal iyonlarının adsorpsiyonunda yüksek adsorpsiyon verimi ile kullanıldığı rapor edilmiştir [17,18]. Bunun en önemli sebeplerinden birisi optimum şartlar altında iyon exchange ve azot atomunun koordinasyona katılması kapasitesinin aynı anda gerçekleşmesidir [19].…”

Section: Adsorption Mechanismunclassified

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

Özçelik¹,

Can

İmamoğlu³

2020

Preprint

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Adsorption of gold, and palladium species containing chlorine ions species onto commercial N-{2-[Bis(2-aminoethyl)amino]ethyl}aminomethyl–polystyrene polymer beads (TRIS) were investigated. The influence of the pH, initial metal ion concentration, and contact time on the adsorption performance was examined in a batch adsorption experiment. Langmuir, Modified Langmuir, Freundlich and Freundlich, Dubinin–Radushkevich isotherm model variables are calculated. The Langmuir monolayer adsorption capacities of the Pd (II), and Au (III) chlorine ions species were found to be 204.5, and 168.5 mg/g, respectively. The two metal adsorption kinetics fit the pseudo-second order kinetic models. In thermodynamic calculations, the choice of different equilibrium constant and withal using dimension containing constant usage are an important problem in the field. To overcome these problems, the Modified Langmuir isotherm equilibrium constant is used at determination of thermodynamic parameters. Adsorption mechanism steps were characterized by using FT-IR, SEM, and EDS. The adsorbent is interacted with each metal ions in HCl solution electrostatic interaction and surface complex formation between the amine groups. The calculation of the thermodynamic parameters using the dimensionless modified Langmuir equilibrium constant calculated more satisfying and more reliable way. All thermodynamic parameters suggested that Pd (II) and Au (III) adsorptions onto TRIS beads was a spontaneous, physisorption.

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Section: Adsorption Mechanismunclassified

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

Özçelik¹,

Can

İmamoğlu³

2020

Preprint

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“…The amino groups can act as an electron-pair donor to the metal ions. As a result, the amine group is able to adsorb metal ions [10][11][12]. The results showed that the adsorption capacity of Cu(II), Ni(II), Pb(II), Cd(II), and Zn(II) increases with increasing nitrogen atom number in the adsorbent [5].…”

Section: ■ Introductionmentioning

confidence: 99%

“…One of the gold separation methods as an ion, Au(III), is adsorption which has many advantages, including environmental-friendly, no hazardous waste, inexpensive, can be applied at a low concentration of metal ion [5] and the adsorbent can be used repeatedly [6]. Various types of adsorbents can be used in the process of Au(III) adsorption, such as nanoporous adsorbents [7], nanofiber membranes [8] and modified silica [5,[9][10][11]. However, adsorption using this type of adsorbent is usually time-consuming in separation between adsorbent and filtrate.…”

Section: ■ Introductionmentioning

confidence: 99%

“…One attempt to improve the effectiveness of silicabased materials as an adsorbent of Au(III) and other metal ions is by modifying it using organic functional groups [10]. The previous researcher proved that the functional groups of amines, monoamine, diamine or triamine are able to be used to modify the silica surface and to be used as a heavy metal adsorbent [5].…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coating of 2-Aminobenzimidiazole and 1-(o-Tolyl)biguanide Functionalized Silicas on Iron Sand Magnetic Material for Sorption of [AuCl<sub>4</sub>]<sup>–</sup>

et al. 2019

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Two novel materials of 2-aminobenzimidiazole (AB) and 1-(o-tolyl)biguanide (TB) modified silicas coated on the iron sand magnetic material (MM@SiO2/AB and MM@SiO2/TB) have been synthesized and were used to adsorb Au(III) from Au/Cu/Ni solution. Silica layering MM was modified with polyamino compounds via a sol-gel process using a sodium silicate solution, 3-chloropropyltrimethoxysilane (CPTS) and modifier compounds. Adsorption of Au(III) on MM@SiO2/AB and MM@SiO2/TB was investigated in a batch system by varying pH, initial concentration, contact time and the presence of other metal ions (Cu(II) and Ni(II)). The results showed that MM@SiO2/AB and MM@SiO2/TB were successfully synthesized through the sol-gel process using cross-linking agent CPTS. Adsorption of Au(III) on MM@SiO2/AB and MM@SiO2/TB decreased with the increase of pH and followed the Langmuir isotherm models with adsorption capacity of 17.15 and 9.44 mg/g, respectively. The adsorption kinetics fit to pseudo-second-order model with the rate constants of 1.16 × 10-2 and 1.46 × 10-2 g mg-1 min-1, respectively. MM@SiO2/AB and MM@SiO2/TB gave a high selectivity towards Au(III) in a mixture of Cu(II) and Ni(II). The desorption using thiourea 1 M solution in 1 M HCl of metal ions showed that percentage of Au(III) desorbed was higher than that of Cu(II) and Ni(II).

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“…In an important step of these processes, it is the adsorption of precious metal ions with adsorbents containing suitable functional groups from leach solutions. In this context, it has been reported that polymers containing primary, secondary and tertiary amine groups are used with high adsorption efficiency in the adsorption of various precious metal ions [5,6]. That is may be having the capacity of different types of amine functional groups to perform ion exchange and coordination simultaneously under optimum conditions [7].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

Özçelik¹,

Can

İmamoğlu³

2020

Preprint

View full text Add to dashboard Cite

Adsorption of gold, rhodium, platinium, and palladium species containing chlorine ions species onto commercial N-{2-[Bis(2-aminoethyl)amino]ethyl}aminomethyl–polystyrene polymer beads (TRIS) were investigated. The influence of the pH, initial metal ion concentration, and contact time on the adsorption performance was examined in a batch adsorption experiment. Langmuir, Modified Langmuir, Freundlich and Freundlich, Dubinin–Radushkevich isotherm model variables are calculated. The Langmuir monolayer adsorption capacities of the Pd (II), and Au (III) chlorine ions species were found to be 204.5, and 168.5 mg/g, respectively. The two metal adsorption kinetics fit the pseudo-second order kinetic models. In thermodynamic calculations, the choice of different equilibrium constant and withal using dimension containing constant usage are an important problem in the field. To overcome these problems, the Modified Langmuir isotherm equilibrium constant is used at determination of thermodynamic parameters. Adsorption mechanism steps were characterized by using FT-IR, SEM, and EDS. The adsorbent is interacted with each metal ions in HCl solution electrostatic interaction and surface complex formation between the amine groups. The calculation of the thermodynamic parameters using the dimensionless modified Langmuir equilibrium constant calculated more satisfying and more reliable way. All thermodynamic parameters suggested that Pd (II) and Au (III) adsorptions onto TRIS beads was a spontaneous, physisorption.

show abstract

Some insights into the chemistry of gold adsorption by thiol and amine functionalized mesoporous silica in simulated thiosulfate system

Cited by 49 publications

References 52 publications

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

Coating of 2-Aminobenzimidiazole and 1-(o-Tolyl)biguanide Functionalized Silicas on Iron Sand Magnetic Material for Sorption of [AuCl<sub>4</sub>]<sup>–</sup>

Adsorption of Pd (II) and Au (III) Ions by Commercial Tris(2-Aminoethyl) Amine Polystyrene Polymer Beads

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