Adsorbent O-H Stretching (alcohol) C-H Stretching (alkane) C=O Stretching (ketone) O-H Stretching (carboxylic acid) C=O Stretching (carboxylic acid) GT 3250 2800-2960 1665 3050 1715 PM 3245 2850-2920 1680 3000 1710

Table 2: FTIR assignments for the adsorbents in cm-1.