Comparing the sorptive affinity of an aluminum-mining by-product for cationic and anionic pollutants
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ORIGINAL PAPER
Comparing the sorptive affinity of an aluminum‑mining by‑product for cationic and anionic pollutants E. Tarso Souza Costa1 · L. Roberto Guimarães Guilherme2 · G. Lopes2 · J. Maria de Lima3 · F. Benedito Ono4 · N. Curi2 Received: 28 April 2020 / Revised: 3 August 2020 / Accepted: 1 September 2020 © Islamic Azad University (IAU) 2020
Abstract Oxide-rich materials, such as “red mud,” an aluminum-mining by-product, are good (ad)sorbents for soil pollutants. This study evaluated sorption reactions of selected cations/anions on aluminum-mining by-product, proposing the calculation of a new distribution constant (i.e., distribution constant at half of the maximum adsorption capacity, Kd(MAC/2)) to assess aluminum-mining by-product sorption efficiency. Adsorption was performed with increasing doses of zinc, copper, cadmium, lead, arsenic, and phosphorus, followed by subsequent desorption (pH 5.5). Data fitted well to both Langmuir and Freundlich equations. The maximum adsorption capacity estimated by the Langmuir equation and the relative adsorption capacity parameter of the Freundlich equation followed the ascending order cadmium
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