The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material

Ren, Xinyao; Wang, Enju; Millán, Fernando; Prato, José G.; Senilă, Marin; Márquez Chacón, Andrés Eduardo; González, Luisa Carolina; Santillán Lima, Guido P.; Silva Padilla, Carla

doi:10.3390/ma17225544

Open AccessArticle

The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material

by

Xinyao Ren

¹,

Enju Wang

¹,

Fernando Millán

^1,2,*,

José G. Prato

^3,4,*

,

Marin Senilă

⁵

,

Andrés Eduardo Márquez Chacón

⁶

,

Luisa Carolina González

^7,8

,

Guido P. Santillán Lima

³ and

Carla Silva Padilla

³

¹

Department of Chemistry, Saint John’s University, Jamaica, NY 11439, USA

²

Ingeniería Química, Instituto Universitario Politécnico “Santiago Mariño”, Mérida 5101, Venezuela

³

Grupo de Investigación Estudios Interdisciplinarios, Facultad de Ingeniería, Universidad Nacional de Chimborazo, Av. Antonio José de Sucre km 1½ vía Guano, Riobamba 060103, Ecuador

⁴

Ingeniería Química, Facultad de Ingeniería, Universidad de Los Andes, Mérida 5101, Venezuela

⁵

Research Institute for Analytical Instrumentation, INCDO INOE 2000, Donath 67, RO-400293 Cluj-Napoca, Romania

⁶

Instituto de Investigación, Facultad de Farmacia y Bioanálisis, Universidad de Los Andes, Mérida 5101, Venezuela

⁷

Grupo de Investigación “Análisis de Muestras Biológicas y Forenses”, Laboratorio Clínico, Facultad de Ciencias de la Salud, Universidad Nacional de Chimborazo, Av. Antonio José de Sucre km 1½ vía Guano, Riobamba 060103, Ecuador

⁸

Laboratorio de Investigaciones Parasitológicas “Jesús Moreno Rangel”, Cátedra de Parasitología, Departamento de Microbiología y Parasitología, Facultad de Farmacia y Bioanálisis, Universidad de Los Andes, Mérida 5101, Venezuela

^*

Authors to whom correspondence should be addressed.

Materials 2024, 17(22), 5544; https://doi.org/10.3390/ma17225544

Submission received: 20 August 2024 / Revised: 29 October 2024 / Accepted: 30 October 2024 / Published: 13 November 2024

(This article belongs to the Special Issue Recent Advances in the Environmental Remediation Using Zeolites and Other Adsorbent Materials)

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Abstract

The adsorption of As(V) and As(III) (0.01–1 mM) on a calcined oxidic lithologic material substrate with pH-dependent surface variable charges, chemically modifiable, was investigated. The substrate was prepared via thermal treatment using a natural lithologic material rich in amphoteric oxides of Fe, Al, Mn and Ti. The calcined substrate was treated with acid media (HCl 0.1) to homogenize the positive charge density on the oxide surface via oxide protonation so that anion adsorption would be favored. A batch experiment was performed on the acid-treated substrate (activated) and non-activated substrate. L-type isotherms were obtained, which fit the Freundlich model. Isotherm constants showed that there was a greater affinity between the activated substrate and As(V) (K = 10.58) compared to As(III) (K = 5.45). The adsorption capacity of the activated substrate was two times greater than that of the non-activated substrate, As(V) (K_act = 10.58 and K_noact = 5.45) vs. As(III) (K_act = 5.45 y K_noact = 2.44), which was due to the greater positive charge density on the activated surface, created by the protonation of the surface oxides. Protons were liberated during the adsorption reaction (As(V): 2.17 × 10⁻³ and As(III): 0.96 × 10⁻³ mmol/mL). The forms H₂AsO₄⁻ and H₃AsO₃ deprotonated when adsorbed by the surface groups

M - O H_{2}^{+}

(M: Fe, Al). Kinetic data showed a second-order process for As(V) adsorption and a first-order process for As(III) adsorption. The adsorption rate on the activated substrate was two times greater compared with the non-activated substrate: As(V) (k_act = 3.78 × 10⁻⁵ L/mg·min and k_noact = 2.16 × 10⁻⁵ L/mg·min) vs. As(III) (k_act = 0.055 h⁻¹ and k_noact = 0.027 h⁻¹). The tested substrate is potentially useful as a low-cost natural material for arsenic removal from contaminated water.

Keywords: adsorption; arsenic; arsenate ions; isotherm; lithological materials; water treatment

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MDPI and ACS Style

Ren, X.; Wang, E.; Millán, F.; Prato, J.G.; Senilă, M.; Márquez Chacón, A.E.; González, L.C.; Santillán Lima, G.P.; Silva Padilla, C. The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material. Materials 2024, 17, 5544. https://doi.org/10.3390/ma17225544

AMA Style

Ren X, Wang E, Millán F, Prato JG, Senilă M, Márquez Chacón AE, González LC, Santillán Lima GP, Silva Padilla C. The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material. Materials. 2024; 17(22):5544. https://doi.org/10.3390/ma17225544

Chicago/Turabian Style

Ren, Xinyao, Enju Wang, Fernando Millán, José G. Prato, Marin Senilă, Andrés Eduardo Márquez Chacón, Luisa Carolina González, Guido P. Santillán Lima, and Carla Silva Padilla. 2024. "The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material" Materials 17, no. 22: 5544. https://doi.org/10.3390/ma17225544

APA Style

Ren, X., Wang, E., Millán, F., Prato, J. G., Senilă, M., Márquez Chacón, A. E., González, L. C., Santillán Lima, G. P., & Silva Padilla, C. (2024). The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material. Materials, 17(22), 5544. https://doi.org/10.3390/ma17225544

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The Adsorption of Arsenate and Arsenite Ions on Oxidic Substrates Prepared with a Variable-Charge Lithological Material

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