Sorption and preconcentration of metal ions on silica gel modified with 2,5-dimercapto-1,3,4-thiadiazole

Lessi, Pedro; Filho, Newton Luiz Dias; Moreira, José C.; Campos, Jorge

doi:10.1016/0003-2670(96)00074-8

Cited by 88 publications

(66 citation statements)

References 11 publications

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“…Similar results using materials analogs to SA been reported in the literature (Do Carmo & Paim, 2012;Lessi et al, 1996;Salles et al, 2004).…”

Section: Resultssupporting

confidence: 88%

Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Soares¹,

Silveira²,

Silvestrini³

et al. 2013

IJC

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This paper describes the preparation of a nanostructured silsesquioxane, the cloropropilsilsesquioxano (S) that was organofunctionalised with the 4-amino-5-4(pyridyl)-4H-1,2,4-triazole-3-thiol (APTT), the material obtained of the functionalization was described as SA. The material SA was characterized by spectroscopy in the region of infrared (FTIR). After proper characterization, were carried studies on adsorption of metallic ions such as Cu 2+ , Ni 2+ and Cd 2+ in the active sites of SA. Different methods were studied in the adsorption of metal ions above: aqueous, ethanol 42% and ethanol 99%, determining the adsorption equilibrium time, which for both means and metals the maximum time averaged 35 minutes. After determining the adsorption equilibrium time of metal ions in each system, we determined the specific sorption capacity (Nf max ) through adsorption isotherms. The results suggest that the sorption of metal ions on DPPIPS occurs mainly by surface complexation and a Langmuir model allowed describing the sorption of the metal ions on SA. The excellent adsorptive capacity made possible the development of a method for determination of metal ions at trace level in real samples such as waste water, ethanol fuel and alcoholics beverages.

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“…Similar results using materials analogs to SA been reported in the literature (Do Carmo & Paim, 2012;Lessi et al, 1996;Salles et al, 2004).…”

Section: Resultssupporting

confidence: 88%

Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Soares¹,

Silveira²,

Silvestrini³

et al. 2013

IJC

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“…Flame absortion atomic spectroscopy (FAAS) in turn has been widely employed for this purpose [4,22,23,24,25,26]. However, a preconcentration step is necessary due to the high limits of detection provided by this technique [24,25,26].…”

Section: Introductionmentioning

confidence: 99%

Metal and metalloid determination in bioethanol through inductively coupled plasma-optical emission spectroscopy

Sanchez

Lienemann

Todolı́

2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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A new method to carry out the elemental determination of metals in bioethanol through ICP-OES has been developed. The procedure is based on the use of a heated Torch Integrated Sample Introduction System (hTISIS) to directly introduce the vaporized sample into the plasma. Two injection modes (continuous liquid aspiration and air-segmented flow injection analysis) have been evaluated. In a first step, the matrix effects caused by several ethanol-water mixtures were removed by operating the hTISIS at 400ºC in segmented injection. Meanwhile, the results also proved that the system could be operated in continuous mode at 200ºC with the complete interferences removal. Finally, twenty-eight real samples with bioethanol contents between 55% and 100% were analyzed with the methods previously developed.Regarding validation, recoveries from 80% to 120% were obtained for 18 analytes and the concentrations found with the proposed method were in agreement with those encountered with a preconcentration method, taken as a reference procedure. Limits of detection went from 3 ng mL -1 for manganese to about 500 ng mL -1 for calcium. This allowed to quantify Cr, Fe, Mg, Mn and Zn in segmented flow injection and Al, Cd, Cr, Cu, K, Mg, Mn, Na and Zn in continuous sample aspiration mode in bioethanol samples.

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“…Com exceção do íon Pb 2+ , para o qual os valores de Nf máximos foram similares nos dois meios estudados, todos os demais íons apresentaram valores de Nf máximos ligeiramente menores em meio etanólico. Este comportamento está em discordância com outros trabalhos encontrados na literatura com sílicas organicamente modificadas, onde se observa uma maior adsorção em meio etanólico quando comparado ao meio aquoso [22][23][24] .…”

Section: Figura 1 Espectros No Infravermelho Das Sílicas Organofunciunclassified

Sílica quimicamente modificada com os grupos p-anisidina, p-fenitidina e p-fenilenodiamina usada como adsorvente para Pb2+, Cu2+, Cd2+ e Ni2+ em soluções aquosa e etanólica

Vilar¹,

Jesus²,

Benvenutti³

et al. 2008

Quím. Nova

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Recebido em 1/2/07; aceito em 17/8/07; publicado na web em 19/12/07 SILICA CHEMICALLY MODIFIED WITH P-ANISIDINE, P-PHENYTIDINE AND P-PHENYLENEDIAMINE GROUPS USED AS ADSORBENT FOR Pb 2+ , Cu 2+ , Cd 2+ AND Ni 2+ IN AQUEOUS AND ETHANOL SOLUTIONS. Silica gel was chemically modified with the aromatic amines p-anisidine, p-phenytidine and p-phenylenediamine, using grafting reactions. The resulting modified silicas were characterized by infrared spectroscopy and N 2 adsorption/desorption isotherms. The organic groups were covalently immobilized in a monolayer form. These modified silicas were investigated as adsorbents for Pb 2+ , Cu 2+ , Cd 2+ and Ni 2+ in aqueous and ethanol solutions. In a general way, the adsorption capacity values for all adsorbents presented the following sequence: Pb 2+ >> Cu 2+ ≅ Cd 2+ ≅ Ni 2+ . Adsorption studies for all adsorbents, in competitive medium, showed better selectivity for Cu 2+ and Pb 2+ in aqueous medium and for Pb 2+ in ethanol solution. Desorption studies were carried out using HCl and HNO 3 as eluents.Keywords: organofunctionalized silica; adsorption; metals. INTRODUÇÃORecentemente tem havido grande interesse na utilização de matrizes sólidas naturais ou sintéticas mecanicamente estáveis em muitas aplicações, tais como fases ligadas quimicamente em cromatografia, extração de cátions de soluções aquosas e não aquosas, reações de troca-iônica ou catalítica, eletrônica, cerâmica e também bioengenharia 1 . Uma importante propriedade explorada está relacionada à adsorção de elementos-traço em superfícies sólidas, levando em consideração a separação e pré-concentração onde um único elemento, ou uma série de elementos com características similares, pode ser separado de uma mistura complexa e determinado quantitativamente 1 .Uma grande variedade de materiais adsorventes para extração em fase sólida de metais tem sido usada, especialmente aqueles baseados em sílicas organofuncionalizadas 1-5 , principalmente porque a matriz sílica pode ser usada tanto em meio aquoso como em solvente orgânico e apresenta grande estabilidade térmica e mecâ-nica. Também é possível se obter boa estabilidade térmica para os grupos orgânicos dispersos na superfície da sílica, desde que estejam fortemente ligados à sua superfície, na forma covalente. Uma forma de se obter sílicas organofuncionalizadas com essa característica é através do uso do método de síntese por enxertia, que permite imobilizar uma grande variedade de espécies orgânicas na superfície da matriz sílica 1,6 . Um trabalho de revisão publicado recentemente 1 relata vários processos de modificação de sílicas para extração de íons metálicos.Neste trabalho, sílicas organofuncionalizadas com aminas aromáticas foram sintetizadas pelo método de enxertia, caracterizadas e utilizadas no estudo da adsorção de íons metálicos em meio aquoso e etanólico, usando-se o método de batelada com determinação por espectrometria de absorção atômica com chama. PARTE EXPERIMENTAL Reagentes e soluções

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Sorption and preconcentration of metal ions on silica gel modified with 2,5-dimercapto-1,3,4-thiadiazole

Cited by 88 publications

References 11 publications

Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Use of a Silsesquioxane Organically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) for Adsorption of Metal Ions

Metal and metalloid determination in bioethanol through inductively coupled plasma-optical emission spectroscopy

Sílica quimicamente modificada com os grupos p-anisidina, p-fenitidina e p-fenilenodiamina usada como adsorvente para Pb2+, Cu2+, Cd2+ e Ni2+ em soluções aquosa e etanólica

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