A predetermined amount of adsorbent
was added to 100 mL solution of known concentration in
250 mL Erlenmeyer flasks at temperature 20 C and agitated at
150 rpm on thermostatic orbital shaker (Scigenics Biotech
ORBITEK) for 120 min. At predetermined time interval, the
adsorbent was separated by centrifugation at 4000 rpm for
10 min. The residual phenol concentration in the supernatant
was determined as stated before.