Effect of activation method on the pore structure of activated carbon from date pits application to the treatment of water

Four active carbons have been prepared by carbonisation without adjuvant (DC) and by chemical activation of date pits with ZnCl2 (DZ), KOH (DK), and H3PO4 (DP) in order to show the effect of variables such as the nature of the chemical reagent, extent of impregnation on the adsorbent surface area, a...

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Published in:Desalination and water treatment 2011-05, Vol.29 (1-3), p.236-240
Main Authors: Merzougui, Zoulikha, Azoudj, Yacine, Bouchemel, Naima, Addoun, Fatima
Format: Article
Language:English
Subjects:
Activated carbon
Activation
Adjuvants
Adsorption
Applied sciences
Capacity
Carbon dioxide
Cell activation
Chemical activation
Chromates
Exact sciences and technology
Inorganic molecules
Ions
Mercury
Mercury (metal)
Microporosity
Organic molecules
Phthalates
Pits
Pollution
Porosity
Potassium
Potassium dichromate
Solutions
Surface area
Surface chemistry
Triton
Water treatment and pollution
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Summary:Four active carbons have been prepared by carbonisation without adjuvant (DC) and by chemical activation of date pits with ZnCl2 (DZ), KOH (DK), and H3PO4 (DP) in order to show the effect of variables such as the nature of the chemical reagent, extent of impregnation on the adsorbent surface area, and porosity of the resulting activated carbons. The pore structure of the activated carbons was characterized by CO2 adsorption at 273 K and by N2 adsorption at 77 K. The macro and mesoporosity were determined by mercury porosimetry. According to the nature of the adjuvant, the activated carbons present different porosity. Chemical activation of the date pits with KOH and H3PO4 produces an activated carbons having mesoporosity as well developed as in the ZnCl2 activation. This last process led also to develop the microporosity more than KOH and H3PO4 activation. Adsorption at 298 K of potassium dichromate, triton X100 and potassium hydrogen phthalate from aqueous solutions on activated carbons has been studied. The adsorption capacity of the activated carbons depended on the surface area and porosity of the carbon, and the nature of the compounds adsorbed. The adsorption of potassium hydrogen phthalate and triton X100 on activated carbons DK, DP and DZ is comparatively better than potassium dichromate.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.5004/dwt.2011.1420