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Thermodynamic Modeling of Experimental Data for the Adsorption of Ternary Antibiotic Mixture from Aqueous Solution Using Flamboyant-Pod-Based Activated Carbon

Year: 2025

Type: article

Abstract: Antibiotic contamination in water poses significant environmental and public health risks, necessitating low-cost and sustainable treatment solutions.This study explores the development of Flamboyant-Pod-based Activated Carbon (FPAC), a bio-based adsorbent, for the removal of a Ternary Antibiotic Mixture (TAM).Raw Flamboyant Pods (FPs) were pretreated, chemically activated with Potassium Hydroxide (KOH), and carbonized at 500 °C for 40 min.The structural and surface modifications of FPAC were characterized using Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray (EDX) analysis and Fourier Transform Infrared Spectroscopy (FTIR) analysis.Batch adsorption experiments were performed under varying conditions of contact time (10-240 min), initial concentrations (20-100 mg/L), and temperatures (40-60 °C).Adsorption thermodynamic parameters, including Gibb's Free Energy (∆G°), Enthalpy Change (∆H o ), Entropy Change (∆𝑠 ° ), Isosteric Heat of Adsorption (∆H x ), Activation Energy (E a ), Sorption Probability (S*), Surface Coverage (θ), and Hopping Number (n), were evaluated to determine adsorption feasibility and mechanisms.FPAC exhibited a porous structure with enhanced carbon content and new functional groups, promoting chemical interactions with antibiotics.Adsorption proceeded rapidly within the first 100 min, achieving maximum capacities of 9.371 mg/g (Amoxicillin, AMO), 9.310 mg/g (Tetracycline, TETRA), and 8.733 mg/g (Ampicillin, AMP).Corresponding removal efficiencies were 85.91, 91.24, and 78.67%.Thermodynamic analysis revealed negative ∆G° and ∆H o values, confirming a spontaneous and exothermic process, while ∆H x and E a values indicated predominantly physisorption-driven adsorption.The findings establish FPAC as an efficient, low-cost, and environmentally friendly adsorbent with strong potential for the remediation of antibiotic-contaminated wastewater.

Source: Journal of Applied Science and Emerging Technology

DOI: 10.14416/jaset.kmutnb.2025.03.002

Authors: Ojo Ilesanmi Ademola, Ajani Adegbenro Sunday, Ajani Oluwatayo Sandra, Mustapha Lateef Olajuwon

Institutions: Al-Hikmah University, Kwara State University, Ladoke Akintola University of Technology Teaching Hospital

Language: English

Topic: Adsorption and biosorption for pollutant removal

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production, Good health and well-being

Open Access status: diamond

OpenAlex ID: W7117499343

FWCI:

Cites: 11

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Related to: 10