Silica gel containing sulfur, nitrogen and oxygen as adsorbent centers on surface for removing copper from aqueous/ethanolic solutions

Machado, Ricardo S A; Fonseca, Maria G.; Arakaki, Luiza N.H.; Espı́nola, José G.P.; Oliveira, Severino F. de

doi:10.1016/j.talanta.2003.10.048

Cited by 72 publications

(51 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, S MPS and S APS presented two other steps of mass losses at lower temperatures: (i) an amount of 1% due to the humidity for these smectites from room temperature to 370 K and (ii) the anchored pendant chains are decomposed from 370 to 600 K interval of temperature, to give 17 and 18% of mass losses. 19,22 As observed, the decrease in the amount of water formation during the heating process for the anchored smectites, clearly supports the use of OH groups in the original surface for coupling to the silylating agents.…”

Section: Thermogravimetrysupporting

confidence: 61%

“…The same procedure for the isotherms of time and concentration was used to calculate the number of moles of the metallic cation adsorbed per gram (N f ), which is given by the difference between the initial (N i ) and the remaining number of moles of metal in the supernatant (N s ), divided by the mass (m) of the compound used, [17][18][19][20] as given in equation 1.…”

Section: Adsorptionmentioning

confidence: 99%

See 1 more Smart Citation

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

Guerra¹,

Santos²,

Airoldi³

2009

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Uma amostra natural de esmectita oriunda do estado do Piauí, Brasil, foi organofuncionalizada com 3-mercaptopropiltrimethoxissilano e 3-aminopropiltriethoxissilano. O espaçamento basal da argila natural é de 0,99 nm e área superficial 48 m 2 g -1. Houve um aumento no espaçamento basal para 1,84 e 2,01 nm e o aumento da área específica para 781 e 795 m 2 g -1 para as argilas quimicamente modificadas, respectivamente. A argila natural e a argila quimicamente modificada adsorveram cátions mercúrio em solução aquosa em pH 3,0 e 298 ± 1 K. Os modelos de isotermas de adsorção de Langmuir, Redlich-Peterson e Toth foram aplicados para ajuste dos dados experimentais com aproximação não linear. Para as interações cátion/centros básicos para cada esmectita na interface sólido/líquido foi utilizada metodologia calorimétrica e foram obtidas as constantes de equilíbrio e os efeitos térmicos exotérmicos. Considerando o número interativo de moles para cada cátion e as constantes de equilíbrio, a entalpia, ∆ int H o (−11,98 a −13,93 kJ mol ). As interações cátion/ centros básicos são de natureza espontânea como demonstram os valores de energia livre de Gibbs, dando o conjunto de dados favoráveis como expressam a entalpia exotérmica e a entropia positiva, mostrando que a esmectita natural e as quimicamente modificadas têm habilidade em complexar mercúrio. Logo, esses materiais são úteis na remoção de mercúrio em um ecossistema.A natural smectite clay sample from Piauí State, Brazil, was organofunctionalized with 3-mercaptopropyltrimethoxysilane and 3-aminopropyltriethoxysilane silyating agents. The basal spacing of 0.99 nm and surface area of 48 m 2 g -1 for natural clay increased to 1.84 and 2.01 nm, and 781 and 795 m 2 g -1 for modified clays, respectively. The natural and chemically immobilized clay samples adsorb mercury cations from aqueous solutions at pH 3.0 at 298 ± 1 K. The Langmuir, Redlich-Peterson and Toth adsorption isotherm models were applied to fit the experimental data with a nonlinear approach. From the cation/basic center interactions for each smectite at the solid-liquid interface, by using calorimetry methodology, the equilibrium constant and exothermic thermal effects were obtained. By considering the net interactive number of moles for each cation and the equilibrium constant, the enthalpy, ∆ int H o (−11.98 to −13.93 kJ mol ). The cation-basic center interactions are spontaneous in nature as demonstrated from favorable enthalpic and entropic results. Natural and anchored smectites have the ability to complex mercury, acting as useful materials for removal of this hazardous metal from an ecosystem.

show abstract

Section: Thermogravimetrysupporting

confidence: 61%

Section: Adsorptionmentioning

confidence: 99%

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

Guerra¹,

Santos²,

Airoldi³

2009

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The organofunctionalization of silica gel usually includes donor atoms such as carbon [18], nitrogen [19][20], sulphur [21], and phosphorous [22]. However, from three different types of phosphorus organofunctionalization: phosphate, phosphonic/phosphonate, and phosphinic, only phosphonate group can be successfully used because of poor hydrolytic or oxidative stability of phosphate and phosphinic.…”

Section: Introductionmentioning

confidence: 99%

Phosphonate Modified Silica for Adsorption of Co(II), Ni(II), Cu(II), and Zn(II)

Widjonarko¹,

Jumina²,

Kartini³

et al. 2014

Indones. J. Chem.

View full text Add to dashboard Cite

A new phosphonate modified silica (PMS) has been investigated for adsorption of Co(II), Ni(II), Cu(II), andZn (II) II)>Co(II)>Ni(II)>Zn(II). Based on the adsorption characteristic, the adsorbent is promising to be applied as a material for solid phase extraction of transition metal ions. Keywords: modified silica; phosphonate; adsorption ABSTRAK Suatu silika termodifikasi fosfonat (STF) baru telah dikaji sebagai adsorben larutan Co(II), Ni(II), Cu(II), dan Zn(II). STF disintesis dengan mengimobilisasi aminoetil dihidrogen fosfat (AEPH

show abstract

“…1, it can be seen that on Cd(II)-IIP and NIP show relatively similar IR band appearing new band at 2939, 52 cm -1 indicating stretching vibration of CH 2 group and at 1640-1560 cm -1 indicating bend vibrations of primer amine (N-H) 9,29 . Fig.…”

Section: Synthesis and Characterization Of Materialsmentioning

confidence: 91%

Correlation of Ionic Imprinting Cavity Sites on the Amino-Silica Hybrid Adsorbent with Adsorption Rate and Capacity of Cd2+ Ion in Solution

Buhani¹,

Herasari²,

Suharso³

et al. 2017

Orient. J. Chem

View full text Add to dashboard Cite

show abstract

Silica gel containing sulfur, nitrogen and oxygen as adsorbent centers on surface for removing copper from aqueous/ethanolic solutions

Cited by 72 publications

References 27 publications

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

Mercury adsorption on natural and organofunctionalized smectites - thermodynamics of cation removal

Phosphonate Modified Silica for Adsorption of Co(II), Ni(II), Cu(II), and Zn(II)

Correlation of Ionic Imprinting Cavity Sites on the Amino-Silica Hybrid Adsorbent with Adsorption Rate and Capacity of Cd2+ Ion in Solution

Contact Info

Product

Resources

About