Removal of ethinylestradiol by adsorption process from aqueous solutions using entrapped activated carbon in alginate biopolymer: isotherm and statistical studies

Abstract

The aim of this study is to decrease ethinylestradiol contaminants using entrapped activated carbon in alginate biopolymer (AG-AC) by adsorption. Different ethinylestradiol concentrations were prepared in the laboratory. The effect of the operating parameter was studied by using different operating parameters (e.g., contact time, pH, concentrations, adsorbent dose and stirring rate). The results were analyzed according to the Freundlich, Langmuir, Temkin and Dubinin-Radushkevich adsorption isotherms. The adsorption data are more appropriate by the Freundlich isotherm. Removal efficiency percentages for ethinylestradiol at pH 3 using dose 10 g/L of the adsorbent for 30 min with a fixed stirring rate at 100 rpm were ~ 84%. The effect of different operating parameters was investigated using linear regression analysis, and they were found to account for more than 99% of the variables affecting the removal process.

Electrospun polyurethane nanofibers coated with polyaniline/polyvinyl alcohol as ultrafiltration membranes for the removal of ethinylestradiol hormone micropollutant from aqueous phase

“…This is expected to happen due to the large surface area available at high dosage, creating more number of sites for adsorption. Thus, high removal percentage is observed [63,67].…”

“…However, the removal percentage is seen to decrease by an increase in concentration from 0.20 to 0.40 mg/L at constant pH 9. A plausible reason could be that all the active sites are already occupied, reaching saturation, and a rise in concentration led to a drop in removal percentage [67]. Fig.…”

“…However, the removal percentage increased linearly with an increase in the dosage of the adsorbent. This could be due to the increase in the number of sites leading to an increase in the contact surface area as the amount of adsorbent increased [67]. The highest removal percentage achieved was nearly 90%, with a 30 mg dosage of the adsorbent at 40 ℃.…”

“…This is because high removal efficiency is expected with a large number of active sites available for adsorption. However, at a higher initial concentration of the solution, less number of sites are left gradually due to saturation leading to a reduction in removal efficiency [67].…”

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

“…At the start of adsorption, the removal efficiency was greater owing to the high active sites' availability of the adsorbent. Then, it decreases with time because of saturation of BPA and reduction of the adsorbent active sites, which caused removal efficiency declination (Abdel-Gawad and Abdel-Aziz 2019). By comparing the removal efficiency of BPA for AB and GO-AB at each pH value, GO-AB adsorbed more BPA than AB, and consequently leads to higher BPA removal rate up to 85% after 480 mins.…”