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RISS 인기검색어
- 검색키워드
- 저자 : Belyaeva Oxana V. (검색결과 2 건)
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Trichloroethylene adsorption from aqueous solutions by activated carbons
Krasnova Tamara A.,Belyaeva Oxana V.,Gorelkina Alena K.,Timoshchuk Irina V.,Gora Natalia V.,Golubeva Nadezhda S. 한국탄소학회 2020 Carbon Letters Vol.30 No.3
We studied trichloroethylene (TCE) adsorption from aqueous solutions in equilibrium conditions by activated carbons (AC). They difer in raw materials, porous structure characteristics and chemical state of the surface. TCE adsorption isotherms were found to have a concave shape, which is characteristic of a sorbent—sorbate weak interaction. It can be a result from electrostatic repulsion of organic matter molecule from polar groups on carbon surface and adsorbed water molecules. The basic parameters of adsorption were calculated by the Dubinin–Radushkevich equation. We determined that for AG-OV-1 and SKD-515 in the coordinates of the Dubinin–Radushkevich equation, there are two linear plots suggesting adsorption in pores of diferent sizes or reorientation of adsorbate molecules on the activated carbon surface. The efciency of TCE removal by the activated carbons was evaluated. To reduce the TCE to the maximum allowable, the lowest sorbent consumption was observed for AC with the highest values of surface area and micropore volume. However, the high cost and hydrophobicity of these adsorbents make it impractical to use them in adsorption columns with a fxed layer. We ofered an adsorbent that reasonably combines extraction efciency, ease of operation and economic feasibility.
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The use of semi-coke for phenol removal from aqueous solutions
Krasnova Tamara A.,Gora Natalia V.,Belyaeva Oxana V.,Gorelkina Alena K.,Golubeva Nadezhda S.,Timoshchuk Irina V. 한국탄소학회 2021 Carbon Letters Vol.31 No.5
The paper deals with a comparative study of equilibrium and kinetics of phenol adsorption from aqueous solutions by means of commercial activated carbons and semi-cokes, difering in the nature of feedstock, production technology and structural characteristics. The main adsorption parameters are calculated with the usage of Langmuir and Dubinin–Radushkevich equations. The change in the characteristics of the structure and state of the surface of semi-coke P2 as a result of modifcation is estimated. It was found that phenol adsorption kinetics is described by a pseudo-second-order model. The adsorption rate constants and the coefcient of external difusion mass transfer are calculated. It is proved that phenol extraction from aqueous solutions presents a mixed-difusion nature, and the process rate is limited by external mass transfer for 13 min for SKD-515 and 22 min for ABG. To increase the adsorption capacity, the oxidative modifcation of the semi-coke P2 was carried out. Considering the economic and technological aspects, ABG semi-coke is recognized as a promising sorbent for phenol extraction from aqueous media.
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