The pH-measurements of the metal ion and buffer solutions were
carried out by an Orion 420 pH-meter and this was calibrated against
standard buffer solutions of pH 4.0 and 9.2. Thermolyne 47900
furnace was used to determine the mmol g−1
surface coverage values
of modified alumina adsorbent via thermal desorption analysis.
Infrared spectra of the modified alumina adsorbents (I–III) were
recorded from KBr using a Perkin-Elmer spectrophotometer