Removal of Azo Dye Reactive Black 5 By Adsorption onto ZnO and CaO
journal of kerbala university,
2013, Volume 9, Issue 2, Pages 321-330
AbstractIn this study, the adsorption of reactive black 5 dye was carried out by
using various surfaces, namely ZnO and CaO. The validity of the adsorption was evaluated by using UV Spectrophotometry through the determination the amount of adsorbed dye. Various parameters such as pH, adsorbent weight, initial dye concentration and contact time were studied in terms of their effect on the reaction progress. Furthermore, Lagergren’s equation was used to determine adsorption kinetics. It is observed that high removal of dye was obtained at pH=5. Removal of dye was increased by increasing initial dye concentration and contact time. High removal of dye was at the time equivalent of 70 min and reached equilibrium. Increasing of adsorbent weight leads to decrease dye adsorption where 0.1gm was the best weight. For kinetics the reaction onto CaO followed pseudo-first order Lagergren’s equation while the reaction onto ZnO followed pseudo-second order Lagergren’s equation and the adsorbed amount onto CaO surface was more than that of ZnO surface.
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