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Title: Mechanisms of arsenic removal from simulated surface water based on As (III) retention on thiol chelating resins.
Authors: Duarte, Graziele
Teixeira, Mônica Cristina
Olusegun, Sunday J.
Ciminelli, Virgínia Sampaio Teixeira
Keywords: Arsenic speciation
Adsorption mechanism
Ion exchange
X-ray absorption spectroscopy
Issue Date: 2021
Citation: DUARTE, G. et al. Mechanisms of arsenic removal from simulated surface water based on As (III) retention on thiol chelating resins. Environmental Nanotechnology, Monitoring & Management, v. 16, 2021. Disponível em: <>. Acesso em: 11 out. 2022.
Abstract: A novel system for arsenic speciation in the aqueous environment has been developed based on the high affinity of As(III) for the sulfhydryl groups present in thiol resins (R-S). The performance of tailor-made cartridges filled with the thiol resin was then compared with a commercial silica-based anion exchange cartridge with a qua- ternary ammonium group (R-N) typically used for As(V) speciation. Both were able to separate arsenic species efficiently, As(V) and As(III), within a broad pH range using flow rates of up to 5 ml min− 1 . The R-S resin was shown to be suitable for the inorganic arsenic speciation in aqueous systems containing calcium, magnesium, ferrous and ferric ions. The R-S selectivity for As(III) was affected only at sulfate or phosphate/As mass ratio > 500, in a behavior similar to R-N for As(V). The thiol resin’s selectivity for As(III) and its immobilization mechanism were investigated through X-ray Absorption Spectroscopy. At pH 5, each arsenic atom bounds to three sulfur atoms, with an As-S inter-atomic distance of 2.26 ± 0.01 Å, and a coordination number (CN) of 2.8 ± 0.3. The separation of the neutral As(III) species by a thiol resin presents itself as an alternative to the available anion exchange methods. The sorption of As(III) on the thiol resin followed a pseudo-second-order kinetic model and can be described by the Langmuir isotherm.
ISSN: 2215-1532
Appears in Collections:DEFAR - Artigos publicados em periódicos

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