Spectroscopic Insights into Amoxicilin-Brazilian Clay Mineral Interactions

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Abstract

Recently, the β-lactam antibiotic amoxicillin is increasingly detected in water due to inefficient
conventional treatment and indiscriminate disposal [1]. Brazilian clay minerals (montmorillonite and
palygorskite) are promising adsorbents due to their low cost, reusability, and high surface area
(150–200 m² g⁻¹). This study characterized this adsorption process by UV-Vis and FTIR for natural and
acid-treated montmorillonite, and natural palygorskite, at pH 2.7, using 1.0 g adsorbent, 10 min
contact, and 100 ppm amoxicillin. UV-Vis showed a hyperchromic effect for natural clays due to Fe³⁺
leaching and Fe³⁺–amoxicillin complex formation, which masked adsorption [2]. Acid-treated
montmorillonite exhibited a hypochromic effect, confirming effective removal. FTIR confirmed
interactions via Si–O and O–H band shifts. Thus, acid pretreatment reduces analytical interferences,
enabling a more reliable assessment of the adsorption mechanisms.

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Programme
19:40 to 21:00 on 09/15/2026
Room 4 and 5
Institutions
  • 1 Federal University of Rio de Janeiro
  • 2 Rio de Janeiro Federal Institute of Education, Science and Technology
  • 3 Centro de Tecnologia Mineral
  • 4 Universidade Federal do Rio de Janeiro - UFRJ
Track
  • TL02 - Solid-State Inorganic Materials and Nanomaterials
Keywords
Montmorillonite
Palygorskite
Adsorption
FTIR
UV-vis