Abstract
Calcium alginate capsules containing Aureobasidium pullulans cells were prepared by an in-situ one-step method. The Cd2+uptakes of “free biosorbent” and “capsule biosorbent” were described well by the Freundlich isotherms. The Cd2+ uptake of “capsule biosorbent” was lower than that of “free biosorbent” with Cd2 +at 100 mg l−1. The total cadmium uptake of “capsule biosorbent” increased with the increase in encapsulated cell density and plateaued at a value of 23 μg Cd2+/capsule with 150 g dry biosorbent l−1 core volume of a capsule. The specific cadmium uptake of encapsulated biosorbent was 85% to that of “free biosorbent” at 35 g biosorbent dry weight l−1 core volume of a capsule, decreased to 35% at 176 g biosorbent dry weight l−1.
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