BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...

3.6.1. Immobilization of Oocystis sp. and Scenedesmus protuberans into
Sodium-Silicate.
In this study, Oocystis sp. and Scenedesmus protuberans were immobilized into
sodium-silicate matrix. The SEM images (Figure 3.26) of Na-silicate immobilized
Oocystis sp. Scenedesmus protuberans. It can be observed that the algal cells were fixed
to Na-silicate matrix. From Table 3.7,The results demonstrates that the immobilization
of the Oocystis sp. and Scenedesmus protuberans into sodium silicate appears to
increase the biosorption of Pb 2+ in great manner in comparison to that of Cd 2+ ,and Ni 2+
(In Table 3.7., the results of the sorption of Pb 2+ , Cd 2+ , and Ni 2+ by both Na-silicate
immobilized and free algae).
(a)
(c)
Figure 3.26. SEM images of Na-silicate immobilized biosorbent: (a) Oocystis sp.,
(b) Scenedesmus protuberans, and SEM image of (c) blank Na-silicate
(b)
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