Assessment of the use of tropical peats as local alternative materials for the adsorption of Pb, Zn and Cd: An equilibrium study

Autor(es)

Raimondi, Isabela Monici ^[1] ; Silvestre Rodrigues, Valeria Guimaraes ^[1] ; Lima, Jacqueline Zanin ^[1] ; Marques, Jessica Pelinsom ^[1] ; Artimonte Vaz, Luiz Augusto ^[2] ; Vieira, Eny Maria ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Geotech Engn, 400 Trabalhador Sao Carlense Ave, BR-13566590 Sao Carlos - Brazil

^[2] Cronos Consultoria, 911 Jose Vaz de Camargo Rd, BR-15993028 Matao - Brazil

^[3] Univ Sao Paulo, Sao Carlos Inst Chem, 400 Trabalhador Sao Carlense Ave, BR-13566590 Sao Carlos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EARTH SCIENCES RESEARCH JOURNAL; v. 25, n. 1, p. 29-40, MAR 2021.
• Citações Web of Science: 2

Resumo

Peat is an organic material that has been widely used as an efficient and low-cost adsorbent. As many studies tend to focus on temperate peals, there is a lack of knowledge about the adsorption mechanism of tropical peals. This paper investigates the use of two Brazilian peats (Cravinhos - C and Luis Antonio - LA) from the Mogi-Guacu river basin for the adsorption of lead (Pb), zinc (Zn), and cadmium (Cd), in order to contribute to the use of local and easy access materials to remediate contaminated sites. The peats adsorbed a high percentage of cations, especially Pb cations (100.0-46.3%), with commercial peat C showing higher adsorption than peat LA. The removal order was Pb2+ > Cd2+ >= Zn2+ for C and Pb2+ > Zn2+ > Cd2+ for LA. The batch data for both peats and for all metals were better fit by the Langmuir isotherm, with adsorption capacities (q(m)) for Pb, Zn, and Cd of 37.3134, 29.0674 and 21.2890 mmol kg(-1) in peat C and 21.7391, 14.2550 and 3.6460 mmol kg(-1) in LA, respectively, values comparable to those of other pests and biosorbents. The studied peats are considered efficient, alternative and low-cost adsorptive materials for these metals. The proximity of peatlands to areas with high potential for contamination necessitates the use of local materials to reduce remediation costs. (AU)

• Processo FAPESP: 15/02529-4 - Caracterização geológica-geotécnica de materiais reativos orgânicos para serem empregados na retenção de metais potencialmente tóxicos
• Beneficiário: Jacqueline Zanin Lima
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/07180-7 - Estudo do grau de contaminação do solo devido a disposição de resíduos de mineração na área da antiga usina Plumbum (Adrianópolis, PR)
• Beneficiário: Valéria Guimarães Silvestre Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/17894-2 - Caracterização geológica e geotécnica de misturas de solo residual do município de Eldorado Paulista (SP) com materiais reativos orgânicos
• Beneficiário: Jéssica Pelinsom Marques
• Modalidade de apoio: Bolsas no Brasil - Mestrado