the specific surface area and micropore volume for spent clay were
119 m
2
/g and 0.043 cm
3
/g indicating that 21% reduction of surface
area occurred.
Several physico-chemical methods, such as FTIR, TGA, DSC and
other analytical methods were used to characterize biodiesel prepared
by transesterification of dry Chlorella alga with 20 wt%
H
at 60 C for 4 h and purified using clay as an adsorbent.
Properties of algae biodiesel were compared with the biodiesel
specifications according to different standards as well as with
FAME synthesized via transesterification using different algae as
a feedstock, such as Chlorella vulgaris [21].
2
SO
4
The FTIR of both crude and purified Chlorella biodiesel is shown