CHARACTERISTICS OF NEW PROMISING BENTONITE COAL SORBENTS MODIFIED BY DIFFERENT COMPOUNDS

Authors

DOI:

https://doi.org/10.15407/scine17.03.087

Keywords:

coal, bentonite clays, activation, carbonization, microscopic structure, bentonite-coal sorbents

Abstract

Introduction. Bentonite clays are traditional inexpensive and effective adsorbents that have a high potential for removing heavy metals from wastewater due to their abundance, chemical and mechanical stability, high exchange ability, and unique structural properties.
Problem Statement. To obtain activated carbon, high-temperature muffle furnaces are used with the consumption of a large amount of electricity, which is economically unprofitable. In addition, the resulting sorbents must be in the form of granules or tablets, have high strength and the ability to be repeatedly used in technological processes.
Purpose. Development of a method for the production of low-cost granular sorbents based on bentonite as a
mineral component, activated carbon, as well as natural production waste (sunflower husk, straw, sawdust, etc. as modifiers), which can be removed from the activation process to increase porosity of these materials.
Materials and Methods. Angren brown coal; bentonite of the Navbakhor deposit was used as a sorbent and a basic substance for the granules formation; modifiers were sodium chloride, potassium, chopped straw, sawdust. Methods of thermal decarbonization and activation of the obtained granules under the optimal conditions (950 °С, 45 min) were applied; the bulk density, the specific surface area, pore types and their total volume was determined by optical microscopy and nitrogen adsorption methods.
Results. Inexpensive hybrid bentonite-carbon sorbents in the form of high-strength granules were synthesized.
The optimal ratio of the main components is Bentonite:Coal = 1 : 2, size (2.5 mm) and strength of granules (83—99%), total pore volume 0.863—1.01 cm3/g, confirmed the presence of macro-, meso- and micropores. The most promising sample has a specific surface area (Langmuir) 184 m2/g.
Conclusions. The method for obtaining new effective granular carbon sorbents of low cost, having high sorption capacity relative to organic and inorganic pollutants for purification of industrial process waters has been proposed.

Author Biographies

Ilkhom Tagaev, Navoi State Mining Institute

Tagaev Ilkhom AkhrorovichPhD in agricultural sciences, Associate Professor., Navoi State Mining Institute, 27a Galaba ave., 210100 Navoi, Uzbekistan

Tel.: +998 0 (436) 223-49-66 Fax: +998 0 (436) 223-23, tagaevilhom3@gmail.com

Manzura Muratova, Navoi State Mining Institute

Muratova Manzura Nematzhanovna - Senior Lecturer, Navoi State Mining Institute, 27a Galaba ave., 210100 Navoi, Uzbekistan

Tel.: +998 0 (436) 223-49-66 Fax: +998 0 (436) 223-23, manzuranematovna@gmail.com

Lyudmila Andriyko, Chuiko Institute of Surface Chemistry, the NAS of Ukraine

Аndriyko Lyudmila StanislavovnaSenior researcher, PhD in chemistry, Chuiko Institute of Surface Chemistry, 17 General Naumov Str., 03164, Kyiv, Ukraine

Tel.: 4229631, +38-066-2400839, andriykolyuda@gmail.com

ORCID ID https://orcid.org/0000-0001-5558-5374

Mohigul Yusuf Kizi Boykhonova, Navoi branch of the Academy of Sciences of Uzbekistan

Boykhonova Mohigul Yusuf Kizi - Research Assistant, Navoi Department of the Academy of Sciences, Тel.: +99893 2393292, mohigulboyxonova@gmail.com

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Published

2021-06-17

How to Cite

Tagaev, I., Muratova, M. ., Andriyko, L., & Boykhonova, M. Y. K. . (2021). CHARACTERISTICS OF NEW PROMISING BENTONITE COAL SORBENTS MODIFIED BY DIFFERENT COMPOUNDS. Science and Innovation, 17(3), 87–95. https://doi.org/10.15407/scine17.03.087

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The Scientific Basis of Innovation