The calculation of composition for mechanical mixture sorbent
Abstract
At present, it is well known how widely the sorption method of water purification from polluting ions is used. However, the sorption method of purification is quite expensive, and a large share of the cost falls exactly on the sorbent itself. Therefore, it is necessary to look for the cheapest methods and materials for obtaining sorbents. These are, the preparation of the sorbent in the form of a mechanical mixture of components.
The composition and properties of the mixture sorbent should provide a certain degree of purification, a sufficiently long service life due to the sorption capacity, a moderate sorbent consumption per unit volume of purified water, a neutral water reaction. The purpose of this paper is to show how it is possible to calculate the capacity of a mixture sorbent based on local technological raw materials, using its characteristics such as
specific surface area, content of acid-base sorption centers and pH of the zero-charge point, taking into account the nature of the sorbed ions and the required neutral reaction purified water (pH = 5-8).
Theoretical positions are supported by the calculations given for the following types of natural raw materials in the Murmansk region: dolomite of the Titanovskoye deposit, quartz sand - a product of nepheline processing and Kovdorsky carbonate concentrate. Thus, it was found that the ratio of these components in the mixture sorbent should be as follows: for the goethite-quartz system - 1:680; carbonatite-quartz - 1:5.7; goethite-
carbonatite - 1:120 and quartz-dolomite - 1:8. In the present article, we give literature data on the physical meaning of the pHPZC value, a number of pHPZC values for natural and synthetic oxyhydroxides. A description is given of the method for the experimental determination of pHPZC using the example of dolomite, quartz sand, carbonate concentrate, and synthetic goethite. The article can be a direct guide for calculating
the composition of a mixture sorbent from two components.
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References
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