Adsorption kinetics and equilibrium of copper and zinc on volcanic tuff

Bong, Frederick Hsiao Pau (2008) Adsorption kinetics and equilibrium of copper and zinc on volcanic tuff. Universiti Malaysia Sabah. (Unpublished)


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The adsorption kinetics and equilibrium of Cu and Zn on volcanic tuff was investigated according to batch method. For comparison, the same experiments were carried out on natural zeolite. The final Cu and Zn concentration in solution was determined using an atomic absorption spectrophotometer (AAS). The results showed that Cu and Zn adsorption by volcanic tuff was rapid with significant removal of the metal from solution during the first 5 minutes. Equilibrium, however, was only attained after 60 minutes. The adsorption conformed to pseudo - second order kinetic model (R² = 0.999) as well as to Langmuir (R² = 0.9) and Freundlich (R² = 0.9) isotherms. Similar pattern was observed for Cu and Zn adsorption by natural zeolite, except the adsorption conforms better to Langmuir isotherms (R² = 0.98). The maximum Cu and Zn adsorption capacity is 1000 μg/g and 796.23 μg/g, respectively for volcanic tuff; and 1111.11 μg/g and 833.33 μg/g, respectively for natural zeolite. Comparatively, Cu and Zn removal by volcanic tuff was less efficient in a mixed metal system compared to single metal system. Overall, the volcanic tuff can potentially be used for the removal of heavy metals, including Cu and Zn, from wastewater.

Item Type: Academic Exercise
Uncontrolled Keywords: adsorption, kinetic, equilibrium, volcanic tuff, batch method, atomic absorption spectrophotometer, wastewater, cuprum, Zinc
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 04 Apr 2014 08:17
Last Modified: 13 Oct 2017 02:03

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