Adsorption of Pb(Ⅱ) by Formaldehyde Treated Naval Orange Peel

Abstract

Abstract: Under controlled conditions, a bio-adsorbent was prepared by reacting naval orange peel with formaldehyde. The effects of initial Pb(Ⅱ) concentration, adsorption time and solution pH on the adsorption efficiency of the bio-adsorbent for Pb(Ⅱ) were investigated. The results indicated that adding 25 mg of formaldehyde treated naval orange peel to 15 mL of 150 mg/L Pb(Ⅱ) solution at pH 5.0 and then shaking the mixture for 2 h at constant ambient temperature resulted in a Pb(Ⅱ) removal rate of 99.85%. The adsorption of Pb(Ⅱ) by the bio-adsorbent reached equilibrium at approximately 2 h and obeyed second-order kinetics. The biosorption process followed Langmuir isotherm equation. The maximum adsorption capacity of the modified naval orange peel was 185.19 mg/g, and the optimum adsorption pH was 4.0—5.5.

Key words: naval peel, formaldehyde modification, Pb(Ⅱ) solution, biosorption

CLC Number:

X703
X712

References

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