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Feasibility of using low-cost, byproduct materials as sorbents to remove heavy metals from aqueous solutions
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This work investigates the sorption of heavy metals by low-cost, byproducts such as charcoal fines (CF), waste green sand, and rice husk ash, in order to examine the feasibility of their use as alternative filter materials for metal-contaminated waters. The sorption of Cd, Cu, Pb, and Zn was investigated in batch experiments and sorption isotherms were constructed. The three byproducts showed high metal removal efficiencies (>95%, regardless of the metal concentration tested). The highest metal sorption distribution coefficients were obtained for CF, with maximum values within the 105-106 L kg-1 range for all the target metals. The sorption isotherms were satisfactorily fitted using the Freundlich equation and a linear model, the latter only being valid for initial metal concentrations lower than 0.4 mmol L-1. Sorption reversibility was very low, with desorption yields lower than 2% and desorption distribution coefficients often higher than 106 L kg-1. The values of the sorption and desorption parameters indicated that the use of these materials, especially CF, could constitute a low-cost alternative for the remediation of contaminated waters.
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DOUMER, Marta E., et al. Feasibility of using low-cost, byproduct materials as sorbents to remove heavy metals from aqueous solutions. Environmental Technology. 2018. Vol. 218, num. 1-10. ISSN 0959-3330. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/134877