Equilibrium and kinetic studies of silver(I) preconcentration on R-modified SMAC sorbent

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A new synthetic sorbent (S1) was obtained based on a copolymer of styrene with maleic anhydride and norsulfazole (S) with subsequent modification by the reagent 4,4'-(ethane-1,2-diylbis(azanylidene))bis(pentan-2-one). The structure of the sorbent S was studied by IR and UV spectrometry. The sorption of Ag(I) ions on the sorbents S and S1 was studied. The influence of various parameters on the sorption process was studied, i.e., pH, contact time, and initial concentration of the metal ion. The results of the conducted studies were presented by various models of adsorption isotherms and kinetic models. According to the results of the studies, sorption is best characterized by the Langmuir model and the pseudo-second-order kinetic model. The maximum static sorption capacity was 420.08 mg/g for sorbent S and 577.24 mg/g for sorbent S1. For adsorption studies, a solution of Ag(I) of a concentration of 2 × 10–3 M was used in the work. Static sorption studies were carried out at room temperature. At the final stage, the process of the desorption of the absorbed silver ions was carried out. For this purpose, mineral (HNO3) and organic (CH3COOH) acids were used in the concentration range 0.5–2.0 M. Synthetic sorbents S and S1 were used to extract silver(I) from mushrooms. The results have shown that the modification of the chelating adsorbent with the reagent 4,4'-(ethane-1,2-diylbis(azanylidene))bis(pentan-2-one) was accompanied by an increase in the sorption capacity, i.e., a simultaneous increase in the efficiency of Ag(I) ion extraction by the obtained synthetic sorption material. Comparative characteristics of the maximum adsorption capacities qmax of various adsorbents with respect to Ag(I) showed that the adsorbents S and S1 have higher sorption capacity.

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作者简介

N. Afandiyeva

Baku State University

编辑信件的主要联系方式.
Email: afandiyeva.narmin@mail.ru
阿塞拜疆, Baku

A. Maharramov

Baku State University

Email: afandiyeva.narmin@mail.ru
阿塞拜疆, Baku

F. Chiragov

Baku State University

Email: afandiyeva.narmin@mail.ru
俄罗斯联邦, Baku

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2. Fig. 1. IR spectrum of a synthetic sorbent modified with norsulfazole.

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3. Fig. 2. (a) UV spectrum of synthetic sorbent S before the concentration process, (b) UV spectrum of synthetic sorbent S after the concentration process.

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4. Fig. 3. The effect of the initial concentration of metal ion on the process of silver sorption by sorbents S and S1, pH 5.

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5. Fig. 4. Langmuir isotherm model.

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6. Fig. 5. Freundlich isotherm model.

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7. Fig. 6. Pseudo-first order kinetic model.

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8. Fig. 7. Pseudo-second order kinetic model.

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9. Scheme 1. Molecular structure of norsulfazole.

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10. Scheme 2. Synthesis of synthetic sorbent S.

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11. Scheme 3. Molecular structure of the reagent 4,4,-(ethane-1,2-diylbis(azanylidene))bis(pentan-2-one).

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12. Scheme 4. Proposed mechanism of Ag(I) sorption on synthetic adsorbent S.

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13. Scheme 5. Proposed structure of sorbent S with sorbed Ag(I).

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