Romoval of Zinc Ion from Aqueous Solution by Adsorption onto Solidifying Landfilled Sludge
In this paper, the removal behaviour of Zn2+ from aqueous solution by adsorption onto solidifying landfilled sludge and its mechanism were studied. The results showed that Zn2+ adsorption capacity reached optimum when initial pH was 3.0. When initial Zn2+ concentration was150mg/L, the removal efficiency could reach more than 90% with dosage of solidifying landfilled sludge being 6g/L. Moreover, the adsorption isotherm could conform to Freundlich equations best. The desorption ratio for adsorbed Zn2+ reached above 90% by HCl solution with pH value being 1.0, however, it was only about 10% despite of EDTA concentration. FTIR analysis showed that main site for Zn2+ adsorption onto solidifying landfilled sludge was Me-O group from metal oxide and hydroxyl group from fatty alcohol.
W. Q. Zhu et al., "Romoval of Zinc Ion from Aqueous Solution by Adsorption onto Solidifying Landfilled Sludge", Advanced Materials Research, Vols. 343-344, pp. 62-66, 2012