Synthesis and physicochemical characterization of a novel adsorbent based on yttrium silicate
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2020
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Journal of Environmental Chemical Engineering
Resumo
A new metallosilicate based on yttrium was synthesized and characterized by XRD, FT-IR, 29Si MAS-NMR, and
89Y MAS-NMR. The mixed framework of the material was confirmed by the detection of distinct chemical shift
groups using 29Si MAS-NMR (at -82 to -87 ppm, -91 to -94 ppm, -96 to -102 ppm, and -105 to -108 ppm), as well
as four distinct chemical shifts in the 89Y MAS-NMR spectrum (at -89, -142, -160, and -220 ppm). Adsorption and
kinetic analyses indicated the potential of the new material for the removal of lead and cadmium from aqueous
media. The adsorption results for lead indicated that dynamic equilibrium was reached after five hours, with
total lead removal of around 94 %, while for cadmium it was reached in the first hour, with total cadmium
removal of around 74 %. The adsorptions of lead and cadmium were modeled using pseudo-first order (PFO) and
pseudo-second order (PSO) kinetic models. Although both models provided high R2 values (0.9903 and 0.9980,
respectively), the PSO model presented a much lower χ2
red value (4.41×10−4), compared to the PFO model
(2.12×10−3), which indicated that the rate-limiting step was probably due to the chemisorption of lead from
the solution onto the yttrium-based metallosilicate.
Como referenciar
MEDEIROS, VINICIUS L.; ARAUJO, LEANDRO G. de; RATERO, DAVI R.; PAULA, ALEX S.; MOLINA, EDUARDO F.; JAEGER, CHRISTIAN; MARUMO, JULIO T.; NERY, JOSE G. Synthesis and physicochemical characterization of a novel adsorbent based on yttrium silicate: a potential material for removal of lead and cadmium from aqueous media. Journal of Environmental Chemical Engineering, v. 8, n. 4, p. 1-10, 2020. DOI: 10.1016/j.jece.2020.103922. Disponível em: http://repositorio.ipen.br/handle/123456789/31476. Acesso em: 06 Jun 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.