ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Adsorptive performance of single-walled carbon nanotubes for divalent manganese sorption characterized by X-ray absorption spectroscopy

Bridinette Thiodjio Sendja, Carol Trudel Tchouank Tekou, Carsten Prinz, and Ana Guilherme Buzanich

Department of Mathematic and Physical Science, University of Yaounde I, National Advanced School of Engineering, Yaounde, Cameroon

E-mail: sbridine@yahoo.fr

Received: 8 May 2025  Accepted: 29 September 2025

Abstract:

The adsorptive performance of divalent manganese onto single-walled carbon nanotubes (SWCNTs) is investigated by X-ray absorption spectroscopy (XAS). The study is focused on the one hand, on the use of SWCNT as adsorbent to remove divalent manganese II) pollutant controlling batch parameters such as pH, adsorbent dose and contact time; and on the other hand, on the characterization of manganese adsorbed by SWCNT (Mn-SWCNT) adsorbent to probe the chemical composition, oxidation state, and local structural environment of Mn absorber. Freundlich adsorption isotherm well fitted the experimental data and suggested the maximum adsorption capacity at pH 2. Ion exchange was proposed as the main adsorption mechanism for removing manganese using SWCNT. XAS results revealed the change in the oxidation state of manganese. The effect of pH, adsorbent dose, and contact time is shown. XAS also showed that Mn-SWCNT material is principally composed of MnCl₂, Mn₂O₃, MnO₂, Mn₃O₄, and MnO in decreasing order with MnCl₂ and Mn₂O₃ as major compounds.

Keywords: Single-walled carbon nanotubes; Divalent manganese; Adsorptive performance; X-ray absorption spectroscopy; Oxidation state; Local environment

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-025-04418-5

Chemical Papers 80 (1) 645–659 (2026)