The prepared activated carbon was characterized by selected
physical properties (bulk density and surface area), chemical
and adsorption properties (point of zero charge: pHpzc).
The elemental analysis was performed by using an elemental
analyzer LECO-CHNS 932. The specific surface area of the
activated carbon was achieved by the BET-technique, as a
sorption phenomenon of nitrogen gas on the adsorbent surface,
at 77 K. The measurements were made using a Pore Size
Micrometric-9320, USA equipment. The ash content Ash (%) of
the activated carbon was determined by heating at 450 ◦C during
3h. The conductivity measurements were carried out with
a type Erwika conductimeter. pHpzc of ASAC was determined
by using KNO3 (0.01 M), 20mL of KNO3 solution were placed
in different closed conical flasks. The pH of each solution was
adjusted between 2 and 14 by adding solutions of HCl (0.1 M)
or NaOH (0.1 M). Then, 0.1 g of ASAC was added and the final
pH was measured after 24h under agitation at room temperature.
The pHpzc is the point where the curve of final pH versus
initial pH crosses the line: final pH = initial pH.
The prepared activated carbon was characterized by selectedphysical properties (bulk density and surface area), chemicaland adsorption properties (point of zero charge: pHpzc).The elemental analysis was performed by using an elementalanalyzer LECO-CHNS 932. The specific surface area of theactivated carbon was achieved by the BET-technique, as asorption phenomenon of nitrogen gas on the adsorbent surface,at 77 K. The measurements were made using a Pore SizeMicrometric-9320, USA equipment. The ash content Ash (%) ofthe activated carbon was determined by heating at 450 ◦C during3h. The conductivity measurements were carried out witha type Erwika conductimeter. pHpzc of ASAC was determinedby using KNO3 (0.01 M), 20mL of KNO3 solution were placedin different closed conical flasks. The pH of each solution wasadjusted between 2 and 14 by adding solutions of HCl (0.1 M)or NaOH (0.1 M). Then, 0.1 g of ASAC was added and the finalpH was measured after 24h under agitation at room temperature.The pHpzc is the point where the curve of final pH versusinitial pH crosses the line: final pH = initial pH.
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