Method of preparation of vegetable-based sorbents

FIELD: production of sorbents used for cleaning aqueous solutions from heavy metals.

SUBSTANCE: peel of citrus plants, orange or lemon for example is cut in pieces, 4-5 mm thick and 30-40 mm long which are washed in water, dried at temperature of 60-65 °C and then 100-105 °C, after which they are ground, dispersed and fraction of 0.2-2 mm is separated.

EFFECT: enhanced efficiency of cleaning aqueous solutions from heavy metals, from copper and cadmium for example.

3 ex

 

The invention relates to the technology of adsorbents, particularly to a method of adsorbents that can be used for the purification of aqueous solutions of heavy metals.

Sorption treatment is one of the most effective ways of removing contaminants from aqueous solutions.

Describes a method for sorbent on the basis of sawdust, which is treated with a chemical reagent - 1(2-hydroxyethyl)-4,5,6,7-tetrahydroindole in acetone solution at a ratio of 1:0.01 and incubated for 12 hours [1].

The sorption capacity of the sorbent in static conditions on heavy metals is 0.8-1.4 mg/g

The disadvantage of this method is the complexity of the technology, low sorption capacity.

A method of obtaining sorbent plant-based, which use the cake from the processing of watermelon seeds for vegetable oil [2].

The cake washed with water (after crushing), dried to constant weight, scatter, selected fraction of 0.2-2 mm Sorption capacity of the sorbent for copper - to 3.9 mg/g for zinc - to 2.6 mg/g

The disadvantages of the method - the limitations of purification of aqueous solutions and resource sorbents.

The technical result is an extension of the sorption abilities, resource and range of sorbents. This is achieved by the fact that, as a vegetable basis using the peel of citrus crops (outer is th shell of the fruit), such as orange and lemon, which contain up to 80% water, the rest of the dry matter, mainly containing fiber and protein-carbohydrate component (complex). Peel is a waste from the processing of citrus juices and partially used [3]. Peel cut into slices with a thickness of 4-5 mm and a length of 30-40 mm, pour water in the ratio 1:4-5, mixed, incubated for 40-60 min, the aqueous layer was separated, again add water, mix, soak, drain the water layer, etc. to obtain a colorless, transparent wash water. The remains of the dried first at a temperature of 60-65°With, then at 100-105°C to constant weight, ground, scatter, selected fraction of 0.2-2 mm - sorbent with a bulk weight of 0.45-0.55 g/cm3containing at least 1 wt.% nitrogen by Kjeldahl method for characterizing protein-carbohydrate component and at least 16 wt.% the fiber. The prepared sorbent allows clear aqueous solutions of heavy metals, such as copper and cadmium, with sorption capacity of 3.5-3.8 mg/g

Example 1. 50 g sliced orange peel with a humidity of 80 wt.% in a flask filled with 200 ml of water, stirred, incubated 50 min, the aqueous layer was separated, re-fill with water, mix, incubated 40 min, the aqueous layer was separated, etc. to obtain a colorless, transparent wash water. The remains of the dried first at a temperature of 60-65°C (1 h), then when 10-105° C to constant weight, ground, scatter, selected fraction of 0.2-2 mm Obtain 9.5 g of sorbent - yellow powder with a bulk weight of 0.51 g/cm3, a nitrogen content by Kjeldahl method 1.1 wt.% and fiber of 18.1 wt.%.

Similarly receive the sorbent during processing of a lemon peel with the release of 9.0 g, a bulk weight of 0.45 g/cm3, a nitrogen content by Kjeldahl method 1.2 wt.% and fiber of 17.0 wt.%.

Example 2. Tests on the sorption capacity. In a flask of 100 ml capacity make 1 g of sorbent from orange peel and 40 ml of an aqueous solution containing 100 mg/l of copper sulfate, mixed, incubated at room temperature until the termination of sorption (for chemical analysis of copper). After 3.5 hours in the water layer of the copper content of 6.4 mg/l, sorrenta capacity of 3.7 mg/g, the degree of purification 93,6%.

Example 3. Into the flask in example 2, make 1 g of sorbent from orange peel, 40 ml of an aqueous solution containing 134 mg/l of cadmium in the form of sulfate, stirred, incubated 4 hours in the water layer of cadmium is 39 mg/l, the sorption capacity of 3.8 mg/g, the degree of purification of 71%.

Similarly, the tests on the sorption capacity of the sorbent from the peel of a lemon.

It is established that the sorption capacity of copper is 3.8 mg/g), cadmium - 3.5 mg/g, with degree of purification, respectively, to 96.9% and 65%.

Thus, the proposed method will clear the aqueous solutions of heavy metals, to expand the resource and the range of sorbents plant-based.

Sources of information

1. SU 1498551, 1987.

2. EN 2212931, 2002.

3. Karchava MS pectin containing raw materials of Georgia and the prospects for its use // Storage and processing of farm products. 2004, No. 1, page 42.

A method of producing a sorbent plant-based purification of aqueous solutions of heavy metals, characterized in that as a plant basis using the peel of citrus crops, such as orange and lemon, waste processing into juice, which is washed with water, dried in two stages, first at a temperature of 60-65°C for 1 h, then at 100-105°C to constant weight, ground, scatter, selected fraction of 0.2-2 mm



 

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