The influence of pH on heavy metals absorption on natural volcanic tuffs

2+ were obtained under different conditions through plotting the normalized effluent metal concentrations (C/C0) versus absorbent volume. Uptake capacity factor for Fe ions was found to be equal to 0.417 mg/g while that of Cu ions was found to be as much as 0.151 mg/g. Results showed that volcanic tuff is an efficient and low cost ion exchanger and absorbent for removing heavy metals. Results also indicated that an initial solution pH of 2.0 was favorable for obtaining high chromium ions removal, while the pH=4 was deemed to be favorable for lead to be absorbed and removed from the aqueous solution. Equilibrium modeling of the removal showed that the adsorption of the metal ions followed the linear adsorption isotherm.

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