SU1428409A1 - Method of producing sorbent for extracting and concentrating ions of metals - Google Patents

Abstract

The invention relates to methods for producing modified sorbents, allows increasing the capacity of the sorbent and achieving the possibility of its repeated use in the isolation and concentration of metal ions. 10 g of silica gel are boiled in a solution of 20.3 g of U-aminopropyltriethoxysilane in 40 ml of toluene for 4 hours, washed with toluene, acetone and dried at room temperature. The resulting sorbent is treated with a 5-10% solution of cyanuric chloride in dioxane for 30 minutes at room temperature, rinsed with acetone and dried at room temperature. The modified silica is placed in a 10-20% solution of aminothiazole or a 20-30% solution of sulfanilic acid in water and kept for 2-4 hours at room temperature. The resulting sorbent is washed with water, acetone, and dried at room temperature. 6 tab. (L

Description

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The invention approaches modified silica sorbents and can be used in the synthesis of sorbents to isolate and concentrate metal ions about

The purpose of the invention is to increase the capacity of the sorbent and the possibility of its repeated use.

Example 1, K10g silica with 8h (p 485 m / g add a solution of S-aminopropyltriethoxysilane (20j3 g) in toluene grade .a. (40 ml) and boil for 4 h, then washed with M5 acetone and dried at room temperature The obtained organo-silica is treated with 80 ml of a 10% aqueous solution of 1-chlorophenol in dioxane for 0.5 h at room temperature. Then it is washed with the same solvent, acetone and dried at room temperature. Then to 50 ml of a 20% solution aminothiazole in water is added amino organosilica treated with cyan chloride Ur, and incubated for 4 hours at room temperature. Washed with water, acetone and dried at room temperature, results IR spektroskopicheskogo8 pH-metric and thermogravimetric studies suggest full i (100% strength) chemical reactions at all stages of the chemical modification.

Table 1 shows the data of IR spectral analysis of samples after each stage of processing.

Claims 2-13, Under the conditions of Imimer 1, the concentration of the cyanure chloride solution, the treatment time with the aminothiazole and the concentration of the amino thiazole solution, is changed. Analysis of the data presented in Table 2 shows that the effect is achieved within the proposed parameters,

Example 14, To 10 g of silica with S-e 495 mUg 1tribuvat solution - minopropyltriethoxysilane (20 uZg) in toluene mark, d, and "(40 W) and boil 4 4g Then washed with toluene, dried with acetone at At room temperature, the resulting amino organo-silica is treated with a solution (80 ml) of 10% cyanuric chloride in dioxane for 0.5 h at room temperature.

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After that, they are washed with the same solvent, with acetone and dried at room temperature, the aminoorganosilica treated with cyanur chloride is added to 50 ml of a 30% sulfanilic acid solution and kept at room temperature for 4 hours. IR results, pH - metric and thermogravimetric studies indicate the complete (100%) course of chemical reactions at all stages of chemical modification of silica.

Example 15-26. In terms of

of Example 14, the concentration of the solution of cyanuric chloride and sulfanilic acid is changed, as well as the processing time. A high degree of modification is achieved within the proposed limits (Table 3).

Example 27

Table 4 presents data on the sorption capacity of the sorbent by a known method and by: examples 1 and 14, Data obtained at pH 1-5, with the ionic strength of the solution O, 1, The sorbent charge O, 1 g, solution volume 10 ml.

Table 5 presents data on the concentration ratios achieved on the proposed sorbents,

Claims (1)

In tab. 6 are tributes; illustrating the possibility of repeated use of the proposed sorbents in the sorption of silver ions. The desorption of ions is not successful from a known sorbent. The method of obtaining a sorbent for the isolation and concentration of metal ions., Including the sequential treatment of silica with Y-aminopropyl-trthoxysilane to aminosilicon and a sulfur-containing organic ligand, so that. in order to increase the capacity of the sorbent - and the possibility of its repeated use; L5 amino-silica is additionally activated with a 5 10% solution of cyanuric chloride in a non-polar solvent; aminothiazole or sulfanic acid is used as ligands, and they are treated with 10% and 20-30% water solutions respectively within 2-4 hours Table 1 The structure of the surface layer of the samples Si - HE t W / N Hg T / wvvsN H- o N-, se y.wwNNH s N -, .Al. NM- VJ / Owsn groups Characteristic absorption bands and their assignment - Si - OH (free)  asim (N-H) i sim. (N-H) f (N-H) in -NHf-rpynnax (C-N) (N-H) in NH-rpynn rf (NH) in NH-C-groups 1530 CM1260 CM 15 16 17 18 19 20 21 22 23 24 25 26 4 4 4 4 10 10 10 10 10 10 10 10 Metal ion Capacity of a known sorbent jiMKocTb offers sorbents. , .. ™. „„ .., „. ,,,. mmol / g 0.98 0.95 0.90 0.44 0.40 0/16 1.96 90 K 80 0.88 0.80 0.32  : five OL8 O., 70 0,, 27 Table 3 60 90 95 too 42 85 95 100 65 93 96 100 Table 4 4 ,, 56 4 4 1 4L.O 2, 16 1, 86 0, 74 Table 5