Various commercially available zeolites were used as adsorbents
(see Table 1). The as purchased zeolites were manually
crushed and sieved to particles in the range of 125–140 lm. The
water content of the zeolite was measured by treating them in
an electric furnace at 300 C for 24 h in air atmosphere, and were
determined from the weight loss after thermal treating.
X-ray diffraction (XRD) patterns for zeolites were identified on a
Philips XPERT-PRO X-ray diffractometer operating at 40 kV and a
current of 30 mA with Cu-Ka1 radiation (0.154 nm) in the 2h scan
range from 5 to 50 with a step size of 0.04 (Fig. 1). According to
the JCPDS powder diffraction database file, it can be seen that the
XRD pattern of each zeolites, is in good agreement with the results
reported in the literature [19]. This result indicates that the zeolites
used in this work possess the highly pure and well-known
crystalline structure.