abstract

• This work aims to study ammonium removal in an aqueous solution by adsorption on natural and modified Palygorskite clay to improve water quality. The palygorskite (Pal) is a fibrous natural clay and was modified by acid treatment using 4 N and 6 N HCl solutions to enhance its adsorption capacity toward ammonium. The Pal modified were designated as Pal-Ac4 and Pal-Ac6. The ammonium adsorption isotherms on Pal, Pal-Ac4, and Pal-Ac6 were evaluated, and the effects of modification, pH, and temperature on the adsorption capacity were analyzed. At an equilibrium concentration of 300 mg/L and T = 25 °C, the adsorption capacity of Pal, Pal-Ac4, and Pal-Ac6 was 2.8, 9.2, and 5.3 mg/g, respectively, and the optimal acid treatment was that for Pal-Ac4. The adsorption capacity of Pal-Ac4 increased, reducing the solution pH from 7 to 3, and the maximum adsorption capacity of Pal-Ac4 was 28.5 mg/g at pH 3.

authors

• Carrales-Alvarado D.H.
• Leyva Ramos Roberto

publication date

• 2024-01-01

funding provided via

• Consejo Nacional de Humanidades, Ciencias y Tecnologías, Conahcyt, (862206); Consejo Nacional de Humanidades, Ciencias y Tecnologías, Conahcyt  Grant

published in

• MRS Advances  Journal

keywords

• pH; Sustainable development; Acid treatments; Adsorption capacities; Ammonium adsorption; Ammonium removal; HCl solution; Modified palygorskite; Natural clays; Palygorskite clays; Water solutions; Adsorption isotherms

Digital Object Identifier (DOI)

• 10.1557/s43580-024-01027-4

PubMed ID

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