Adsorptive Behavior of an Activated Carbon for Bisphenol A Removal in Single and Binary (Bisphenol A—Heavy Metal) Solutions

Abstract

Bisphenol A (BPA) is an extensively produced and consumed chemical in the world. Due to its widespread use, contamination by this pollutant has increased in recent years, reaching a critical environmental point. This work investigates the feasibility of bisphenol A adsorption from industrial wastewater solutions, testing the reduction of bisphenol A in synthetic solutions by a commercial activated carbon, AC-40, in batch mode. Besides, mixtures of bisphenol A and different heavy metal cations were also studied. So far, no works have reported a complete study about bisphenol A removal by this activated carbon including the use of this material to remove BPA in the presence of metal cations. First, adsorption experiments were performed in batch changing pH, dose of adsorbent, initial bisphenol A concentration and contact time. Results showed greater retention of bisphenol A by increasing the acidity of the medium. Further, the percentage of bisphenol A adsorbed increased with increasing contact time. The selected conditions for the rest of the experiments were pH 5 and a contact time of 48 h. In addition, an increase in retention of bisphenol A when the dose of adsorbent increased was observed. Then, specific experiments were carried out to define the kinetics and the adsorption isotherm. Equilibrium data were adequately fitted to a Langmuir isotherm and the kinetics data fitted well to the pseudo-second-order model. The maximum adsorption capacity provided by Langmuir model was 94.34 mg/g. Finally, the effect of the presence of other heavy metals in water solution on the adsorption of bisphenol A was analyzed. Binary tests revealed competition between the adsorbates and a significant selectivity toward bisphenol A. Finally, the study of the adsorption performance in three consecutive adsorption–desorption cycles showed efficiencies higher than 90% in all cycles, indicating that the activated carbon has good reusability.

Bisphenol A Adsorption from Aqueous Solution using Graphene Oxide-Alginate Beads

“…As a result, the BPA could not be taken by the adsorbent, thus, reducing the removal efficiency of the adsorbent (Huang and Wang 2018). These results were in accordance to other previous works (Liu et al 2018;Martín-Lara et al 2020). It should be noted that when the BPA concentration was higher than 100 mg•L -1 , the BPA removal (%) was not substantially influenced by the initial BPA concentration.…”

Adsorption modeling by two sites Langmuir type isotherm for adsorption of bisphenol-A and diethyl phthalate onto activated carbon in single and binary system

“…Among them, activated carbon has been used as a typical general adsorbent due to getting at ease, inexpensive, and so on. Many studies on the adsorption of EDCs onto activated carbon have been carried out in terms of especially adsorption kinetics and adsorption isotherm (Toledo et al, 2005;Hohan et al, 2007;Kumar and Namasivayam, 2014;Sudhakar and Srivastava, 2016;Martín-Lara et al, 2020). However, most of these studies have only reported which are the well-established adsorption kinetics models or adsorption isotherms equations agreed well with the experimental results.…”

Thermodynamic, Nonlinear Kinetic, and Isotherm Studies of Bisphenol A Uptake onto Chemically Activated Carbons Derived from Safou (Dacryodes edulis) Seeds

“…is phenomenon promotes the establishment of electrostatic interactions of an attractive nature between the bisphenol A molecules positively charged in solution and the NSST activated carbon whose surface is negatively charged. is is due to the fact that the pH ZPC (6,94) of NSST AC is greater than pH 6 of the analyte solution [45]. Figure 5(b) shows that the quantity of adsorbed pollutant decreases when the mass of carbon increases from 25 to 100 mg. is behavior may be due to the number of adsorption sites, which decreases with the amount of adsorbent [46].…”