Abstract
We studied trichloroethylene (TCE) adsorption from aqueous solutions in equilibrium conditions by activated carbons (AC). They differ 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 different sizes or reorientation of adsorbate molecules on the activated carbon surface. The efficiency 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 fixed layer. We offered an adsorbent that reasonably combines extraction efficiency, ease of operation and economic feasibility.
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Abbreviations
- °C:
-
Degree celsium
- μmol:
-
Micromol
- mmol:
-
Millimol
- mg:
-
Milligram
- ml:
-
Millilier
- nm:
-
Nanometer
- C 0 :
-
Initial trichloroethylene concentration (mmol/l)
- C b :
-
Breakage trichloroethylene concentration (mmol/l)
- C e :
-
Equilibrium trichloroethylene concentration (mmol/l)
- C s :
-
Solubility (mmol/l)
- E :
-
Characteristic adsorption energy (J/mol)
- q 0 :
-
Adsorption capacity limit (mmol/g)
- q :
-
Trichloroethylene adsorption (mmol/g)
- q b :
-
Specific capacity of the adsorbent to breakage (mmol/g)
- m :
-
Sorbent mass (g)
- m e :
-
Dose of sorbent (g/l)
- S BET :
-
BET surface area (m2/g)
- V :
-
Solution volume (l)
- W 0 :
-
Adsorption space limit (cm3/g)
- AC:
-
Activated carbon
- AST:
-
Average thickness of the adsorption layer (nm)
- COC:
-
Chlorinated organic compounds
- TVFM:
-
Theory of volume filling of micropores
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Acknowledgements
The research was carried out in the framework of ‘Initiative scientific projects’ 19.4713.2017/БЧ state task.
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Krasnova, T.A., Belyaeva, O.V., Gorelkina, A.K. et al. Trichloroethylene adsorption from aqueous solutions by activated carbons. Carbon Lett. 30, 281–287 (2020). https://doi.org/10.1007/s42823-019-00096-y
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DOI: https://doi.org/10.1007/s42823-019-00096-y