A method of producing a sorbent for the extraction of metal ions from solutions


The invention relates to silica chemically modified sorbents. Removal of metal ions was carried out by treatment of aqueous solutions of salts of these metals modified burnt breed field "Distant mountains", Kiselevsk, Kemerovo region. To improve the sorption properties of burnt rocks hold its modification with a solution of sodium phosphate concentration of 0.001 mol/l to 20 ml per 1 g of sorbent at a temperature of 20oC for 30 minutes the Invention allows to simplify the method of obtaining and increase the capacity of the sorbent to the ions of copper, cadmium and lead. table 1.

The invention relates to silica chemically modified sorbents and can be used to extract metal ions from solutions.

In industrial use, mainly reagent method of treatment of wastewater containing heavy metal ions.

The disadvantage of this method is the low degree of wastewater treatment. The residual metal content of up to several mg/l, although Macs for many metals is set at 0.1 to 0.01 mg/L. in Addition, after conducting a purification reagent increases the salinity of the water, which makes it difficult dallascorben vegetable waste (sawdust, bark, sludge-lignin). As modifiers using different complexing agents.

The disadvantages of this method include the low sorption capacity of the proposed sorbents. For example, the capacity of the most selective to ions of heavy metals sludge-lignin, modified 4-methyl-5-azanon-3,5-dandia-2,9, is 2.3 mg/g for copper ion (II) and 0.08 mg/g for cadmium ions (II) [1].

Closest to the present invention is a method of purification of water from heavy metal ions using modified silica. The sorbent is produced by processing silica (silica gel 750/65 aminopropionic) solution diphenylthiourea phosphorus in an organic solvent. The molar ratio aminopropionic silica, and organic modifier base 1:(1-1,5): (1-2). The sorption capacity of the obtained sorbent by copper ions (II) 25 mg/g of sorbent [2].

The disadvantage of this method is its multi-stage, using a large number of reagents and low sorption capacity obtained adsorbents.

The aim of the invention is to simplify the method of preparation and increase the capacity and selectivity of the sorbent to copper ions (II), cadmium (II) and lead (II). In addition, the aim of the invention I the cleaning water from ions of copper (II), cadmium (II) and lead (II) as a sorbent use natural silica - burnt rock, modified phosphate and sodium carbonate.

The method is as follows.

As sorbent use burnt breed field "Distant mountains" , of Kiselyovsk, Kemerovo region the following composition, wt.%: SiO2- 68,2, Al2About3- 21,5, Fe2O3- 4,7, others - 5, with a total porosity of 50-60%. To improve the sorption properties of burnt rocks its process solutions-modifiers.

Example 1. Into the flask make 1 g of burnt rocks with particle size of 1.5-2 mm, add 20 ml of sodium phosphate concentration of 0.001 mol/l, maintained at a temperature of 20oC for 30 minutes, the solid phase is separated by filtration, washed with distilled water. Get the sorbent, containing on the surface of the phosphate ions and having a sorption capacity for copper ions (II) - 36 mg/g), cadmium (II) - 21.2 mg/g) and lead (II) of 45.3 mg/,

Example 2. In the conditions of example 1. Modified sorbent is carried out at a temperature of 60oC. the Capacity of the obtained sorbent by copper ions (II) - 38 mg/g), cadmium (II) - 22 mg/g) and lead (II) - 48.6 mg/,

Example 3. In the conditions of example 1. Used as a modifier sodium carbonate with Conti temperature of 20oC. the Capacity of the obtained sorbent by copper ions (II) - 32 mg/g), cadmium (II) - 12.1 mg/g) and lead (II) of 37.7 mg/,

Example 4. In the conditions of example 3. The modification is carried out at a temperature of 60oC. the Capacity of the obtained sorbent by copper ions (II) of 34.8 mg/g), cadmium (II) - 14 mg/g) and lead (II) - 39,6 mg/,

Example 5. As sorbent use clean burning rock. Sorption of metal ions is carried out at a temperature of 20oC. the Capacity of the sorbent for ions of copper (II) - 13.9 mg/g), cadmium (II) - 4.2 mg/g) and lead (II) to 30.2 mg/,

Example 6. In the conditions of example 5. Sorption of metal ions is carried out at a temperature of 60oC. the Capacity of the sorbent for ions of copper (II) - 16 mg/g), cadmium - 6,5 mg/g) and lead to 33.6 mg/,

The table summarizes data for examples 1-6. The sorption capacity of the obtained sorbents for copper ions (II) is 14-38 mg/year Use as sorbent modified burnt rocks allows us to simplify the process of water purification. The obtained sorbents are characterized by selectivity towards copper ions (II), cadmium (II) and lead (II), low cost, they are non-toxic and have a high kinetic parameters.

Sources of information 1. C. S. Timofeeva, O. C. Lykov, B. F. Kukharev // Chemistry and technology of water, 1990, T. 12, 6.

2. A. C. 1613129 the USSR, MKI 01 D 15/08/ C. The Way of the sorbent for the extraction of metal ions from solutions including the modification of the silica carrier, characterized in that as the silica carrier used burnt breed of the following composition, wt. %: SIO, SIS268,2, Al2About321,5, Fe2About34,7, rest 5, with a total porosity of 50-60%, and as a modifier using sodium phosphate.


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