Cellulose containing composite sorbents to remove heavy metals from wastewater
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66.081.3:628.31 (1)
Tehnologie chimică. Industrii chimice și înrudite (1496)
Tehnică sanitară. Apă. Igienă sanitară. Tehnica iluminatului (286)
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HAYRAPETYAN, Sergey, HAYRAPETYAN, M., MARGARYAN, Liana, BANYAN, Lilit, PIRUMYAN, Gevorg. Cellulose containing composite sorbents to remove heavy metals from wastewater. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.1, p. 80. ISBN 978-9975-159-07-4.. 10.19261/eec.2022.v1
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Ecological and environmental chemistry
Ediția 7, Vol.1, 2022
Conferința "Ecological and environmental chemistry 2022"
7, Chișinău, Moldova, 3-4 martie 2022

Cellulose containing composite sorbents to remove heavy metals from wastewater

CZU: 66.081.3:628.31

Pag. 80-80

Hayrapetyan Sergey, Hayrapetyan M., Margaryan Liana, Banyan Lilit, Pirumyan Gevorg
 
Yerevan State University
 
Disponibil în IBN: 4 martie 2022


Rezumat

The most common and effective method for heavy metals removal is sorption method. The advantage of this method is that it is possible to purify wastewater that contains a large amount of impurities (for example, organic or inorganic). In recent years, for water purification, much attention has been paid to natural sorbents or sorbents based on materials of natural origin. Natural sorbents are widely used due to their low price. The cost of natural sorbents is ten times less than the cost of artificial sorbents. In the past few years, chemically modified carriers have been proposed to improve the adsorption selectivity towards ions. The most promising carriers were ion exchange resins, cellulose, activated carbons, natural minerals. The application of these materials led to the development of several new sorbents. Cellulose is the most common biopolymer in the world and the presence of several hydroxyl groups in the structure of its molecules allows modifying its surface properties with the introduction of several chemical groups. Cellulose and its derivatives are used as an adsorbent to remove several contaminants. After chemical modification, cellulosic materials exhibit new properties that are more effective than starting materials. These new modifying groups on the surface of cellulose increase the interaction with pollutants (metals, dyes, drugs, etc.) in the process of absorption from the aqueous medium, which strongly depends on the pH of the solution. Cellulose materials modified by various functional groups are promising for use in the removal of pollutants from the aquatic environment. By ICP-MS method, the sorption properties of organic-mineral composite sorbents are investigated. The diatomite of the Jradzor deposit and bentonite of the Sarigyuh deposit (Armenia) were used as inorganic constituents. Diatomite serves as a structure-forming component and provides mass transfer due to its high porosity (V=2.0 cm3/g) and large pore sizes, the size of which is 150-200 nm. Bentonite is responsible for the functionality of the sorbents. The organic component is also responsible for the functionality of the resulting sorbents. As the organic component used paper, pre-treated with acids (nitric and phosphoric). A synthetic solution containing cations of heavy metals was used as an object of study. The experiments were carried out in a static mode on the device Jar-Test.