Comparison of Arsenate Adsorption from Neutral pH Aqueous Solutions Using Two Different Iron-Trimesate Porous Solids: Ki
- PDF / 1,896,186 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 67 Downloads / 168 Views
Comparison of Arsenate Adsorption from Neutral pH Aqueous Solutions Using Two Different Iron‑Trimesate Porous Solids: Kinetics, Equilibrium Isotherms, and Synchrotron X‑Ray Absorption Experiments Eliana Berardozzi1 · Jimena S. Tuninetti1 · Fernando S. García Einschlag1 · Omar Azzaroni1 · Marcelo Ceolín1 · Matías Rafti1 Received: 25 July 2020 / Accepted: 28 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We have explored the use of two different iron-based porous materials for arsenic uptake from neutral pH aqueous solutions. Both materials are reminiscent of a material known as MIL-100(Fe), a Metal Organic Framework (MOF) built upon the coordination of Fe(III) ions with trimesate organic linkers (benzene tricarboxylic acid). Aside from the proverbial high surface area with extended microporosity/mesoporosity, the presence of Fe(III) centers offers the possibility of specific strong interactions with arsenic, therefore making it appealing for its use in detection and purification technologies. Our approach tackles the characterization of the system from both physical and chemical perspectives. We report equilibrium isotherms and time dependent arsenic uptake for the determination of adsorption capacity and kinetics; and also, by means of synchrotron-based X-ray absorption techniques, we probe possible changes in coordination environments and oxidation states of Fe and As in the porous network occurring upon adsorption at high and low loadings. The results presented bring further insight on the nature and diversity of adsorption sites present and confirm the suitability of the proposed adsorbents for the intended use. Keywords Fe-BTC MOFs · Arsenic removal · EXAFS/XANES · MIL-100(Fe) · Basolite F-300
1 Introduction The presence of arsenic in ground water is an environmental, health and economical issue which affects developing countries around the world [1]. Long-term consumption of water with high arsenic-content can cause several healththreatening effects for lung, bladder, and kidney; as well Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10904-020-01774-5) contains supplementary material, which is available to authorized users. * Marcelo Ceolín [email protected] * Matías Rafti [email protected] 1
Facultad de Ciencias Exactas, Departamento de Química, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata (UNLP), CONICET, La Plata 1900, Argentina
as pigmentation changes, skin thickening, neurological disorders, muscular weakness, and nutritional diseases [2–4]. Arsenic excess is therefore categorized as dangerous by the World Health Organization (WHO), the USA Environmental Protection Agency (US-EPA), and the European Commission Drinking Water Directive. Accordingly, a guideline value of 10 ppb (0.01 mg/L) for the maximum allowable limit in drinking water was recently stablished [5]. However, since advanced water treatment methods needed fo
Data Loading...
