Sorption of Bisphenol A from aqueous solutions by acid activated bentonite clay

• Published in: Desalination and water treatment Vol. 285; pp. 121 - 128
• Main Authors: Hadoudi, Nouhaila, Charki, Asmae, El Ouarghi, Hossain, Salhi, Amin, Amhamdi, Hassan, Ahari, M’hamed
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-02-2023
• Subjects: Adsorption; Bentonite; Bisphenol A; Equilibrium isotherms; Kinetics; Bentonite; Bisphenol A; Equilibrium isotherms; Kinetics; Adsorption
• ISSN: 1944-3986; 1944-3986
• DOI: 10.5004/dwt.2023.29295

Batch measurements were conducted to assess the adsorption performance of raw and acid-activated bentonite with various operating conditions, including pH, initial Bisphenol A (BPA) concentration, contact time, and temperature. Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy were used to study the structure and morphology of bentonite. On a laboratory scale, isotherm experiments were carried out, and the results were compared to the Langmuir and Freundlich isotherm models. The Langmuir model fits the equilibrium data well. The optimum conditions for the removal of BPA within the experiment range of variables studies were 1 g/L of initial BPA concentration, pH value of 3, 0.25 g/100 mL of adsorbent dose and 180 min of contact time. The maximum removal efficiency was 51.8% under these conditions. The experimental results indicate that the adsorption was degraded by increasing the pH. The decrease of adsorbent characteristics with increasing temperature from 25°C to 65°C was observed in this work, indicating exothermic and chemical adsorption in nature.