Abstract
This paper deals with removal of strontium ions from solution by expanding rice husk (ERH) in a fixed-bed column. The absorption characteristics of expanding rice husk for strontium ions were studied systematically. The effects of different column design parameters like bed depth, flow rate and initial strontium concentration on the equilibrium uptake of ERH for strontium ions were investigated. It was found that the equilibrium uptake (qeq(exp)) of the ERH increased with the increase in initial strontium concentration but decreased with the increase in flow rate and bed depth respectively. Strontium cumulative removals of 2.32 mg/g were obtained under the optimum operational conditions at a flow rate of 10 ml/min and bed depth of 6 cm. XPS analysis indicated that the Sr (II) ion was absorbed on ERH. The adsorption data fitted well with the bed depth service time (BDST) model.
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