KINETIC STUDIES OF BIOSORPTION OF Cr2+ AND Cd2+ IONS USING TEA LEAVES (Camellia sinensis) AS ADSORBENT
AbstractRapid industrialization has generated large quantities of liquid effluents from heavy metals such as cadmium, cobalt, lead, chromium, nickel, mercury, uranium, selenium, zinc, arsenic, gold, silver, copper and Manganese, etc. The presence of heavy metals such as chromium and cadmium with high level of toxicity detected in surface water has attracted much attention. In this research work, low-cost adsorbent prepared from tea leaves (Camellia sinensis) was physicochemically characterized and evaluated for the effective removal of chromium and cadmium from an aqueous phase solution. The Camellia sinensis adsorbent precursor was characterized in terms of adsorbent dosage, initial concentration and contact time. Aqueous phase adsorption studies were carried out under kinetic studies of pseudo first-order and pseudo second-order kinetics. At optimal conditions, chromium and cadmium uptake increases with increase in biosorbent dosage, in this study the optimum dosage was 2 g. The removal of chromium and cadmium was more than 90% in 10, 20, 30 and 40 minutes of contact time. It is obvious that Camellia sinensis is a suitable adsorbent that can be used for the effective removal of high chromium and cadmium concentration in waste water or industrial effluents as shown by the adsorption kinetic studies.
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