Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/37557
Título: Increasing arsenic sorption on red mud by phosphogypsum addition
Palavras-chave: Trace element
Adsorption
Desorption
Mining waste
Data do documento: Nov-2013
Editor: Elsevier
Citação: LOPES, G. et al. Increasing arsenic sorption on red mud by phosphogypsum addition. Journal of Hazardous Materials, [S.l.], v. 262, p. 1196-1203, Nov. 2013.
Resumo: Mining by-products have been tested as adsorbents for arsenic in order to reduce As bioavailability. This study evaluated a red mud (RM) treated with or without phosphogypsum (G) in order to improve its As retention. Red mud and G samples and their mixtures were chemically and mineralogically characterized to gather information concerning their composition, which is key for a better understanding of the adsorbent properties. Phosphogypsum was added to RM in the following proportions: 0, 1, 2, 5, 10, and 25% by weight. These mixtures were subjected to As adsorption and desorption and tested for their maximum adsorption capacity of As (AsMAC). Arsenic adsorption increased upon increasing the proportion of G added to RM. The AsMAC at pure RM reached 909 mg kg−1, whereas the 75%-RM + 25%-G mixture sorbed up to 3333 mg kg−1 of As, i.e., a 3.5-fold increase in AsMAC. Using G in mixtures with RM increases the efficiency of As adsorption due to the presence of Ca2+, which alters the charge balance of the adsorbent, leading to the formation of ternary complexes. Addition of G to RM is thus a promising technique to improve As retention, while providing additional value to both by-products, G and RM.
URI: https://www.sciencedirect.com/science/article/pii/S0304389412006942
http://repositorio.ufla.br/jspui/handle/1/37557
Aparece nas coleções:DCS - Artigos publicados em periódicos

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