SU637139A2 - Method of preparing ion-exchange agents based on heavy metal sulfides - Google Patents

Description

OD mol / l Process under a static condition a sample of a chemically pure carrier with a solution of bismuth for 10 days. The carrier containing bismuth is washed with water and treated with a solution of sodium sulfide for 1 day, after which the sorbent is washed with water and dried.

Example. A 10 cm titanogel with O, 2-O, 4 mm titanium is placed in a Soxhlet apparatus and washed with hot water until a negative reaction to chlorine ions. A weighed portion of the washed titanogel, equal to 5 g, is brought into contact with 0, O5 M solution of bismuth nitrate in an alkaline solution of 1 O% glycerol at pH 12.0 and left in contact for 10 days.

After the specified time, the sample is rinsed with water and treated with 0, O01 M sodium sulfide solution for 1 day. The resulting sample contains 0.21 mg.eq / g sulfur (in terms of S). After the indicated time, the black sample is washed with water, dried and used to Absorb cations and anions.

Similarly, with the same carrier receive samples containing 1,2; 3.68 and 0.3; 3, O7; 5.8 mg eq / g of sulfur (in terms of S), respectively, using solutions of sodium sulfide, the following concentrations: 0.03; 0, O5; 0.0015; O, O45; OD mEq / ml

The composition and ion exchange characteristics of the resulting sorbent are given in table. one.

PRI and M e p 2. Highly porous carriers — titanogal and a hetero-oxide sorbent based on titanogel containing manganese dioxide are treated with a 0.15 M solution of bismuth in a 25% solution of glycerol at pH 12.27 for Yusut, after which the samples are washed with water and process O, O01 M sodium sulfide solution for 1 day. The resulting sample contains 0.20 mg Eq / g sulfur (in terms of S). Samples with the content of 1Д6 and 4.40 mg.eq./g of sulfur (in terms of S) are obtained in a similar way, processing them respectively 0, O1; 0.1 M solutions of sodium sulfide. After this time, the black sample is washed with water, dried and used to absorb cations and anions. The composition and ion-exchange characteristics of the sorbent are given in table. one.

The activity of sulfide-containing samples on the sorption of chlorine ions was determined on a 0.1 M solution of Cu SO at pH 2.8 and 10, O5 during the contact time of 1 day at T: K - 1: 1OO and 1: 20O, respectively.

The exchange capacity for Cu was determined by 0.81 M aqueous solutions of copper sulfate at T: W - 1DPA for 1 day, contact 3 r-f f-I

Table

Carrier. 5 For convenience of comparison, Table 2 shows the characteristics of sorbents.

The proposed method of obtaining ion exchangers, in contrast to the prototype method, allows to obtain a sorbent with a well-developed surface, mechanically strong (the strength of the proposed sorbent is almost 3 times higher than the strength of the prototype sorbent), operating in a wide range of pH 2.89-1O, O5, having increased activity in relation to the chloride ion, (ESR on CE. reaches 1.52 mg eq / g). In addition, the proposed sorbent also has a cationic activity (the CO2 OYE is O, 38 O, 81 meq / g), which is preserved

after calcination of the sorbent at 4OO ° C.

Claims (1)

The formula of the invention and the method of obtaining non-exchangers based on heavy metal sulphides according to ed. No. 521OO4, which is characterized by the fact that, in order to obtain a mechanically strong sorbent with increased activity to anions, for example chloride, in a wide pH range, a highly porous tetravalent metal base carrier, for example titanogel, is introduced into the initial solution of bismuth salt. 637139 radiated by the proposed method and the prototype method, therefore a b and U a 2