Enhanced antibiotic removal by waste coffee grounds prepared via water washing and KOH activation

Abstract

This paper proposed a method to remove amoxicillin (AMX) from waste coffee grounds (CGs) using environmentally friendly activated biochar-based adsorbents. KOH-activated adsorbents (activated CGs or ACGs) were prepared by washing with water to avoid using toxic chemicals. The maximum adsorption capacity and kinetics of the ACGs were evaluated using the Freundlich isotherm, Langmuir isotherm, adsorption density, and pseudo-second-order equation. ACG-4a (activated by KOH after washing with water) exhibited a significantly higher adsorption capacity (740.7 mg/g), whereas ACG-4b (activated by KOH after washing with NaOH) exhibited a lower capacity (549.5 mg/g). The specific surface area of the adsorbent is key to the adsorption performance. A comparison of the adsorbents revealed that the ACGs exhibited the highest AMX-adsorbing capacity. Their use has important environmental implications for water pollution mitigation and ecosystem preservation.

Treatment of cefixime-containing wastewater using ultrasound, H2O2, and sodium persulfate and antimicrobial analysis

“…There are many studies on the photodegradation of cefixime available in the literature and most of the work is limited to analysis of the potential effect of synthesis material for removal of cefixime (Almasi et al 2020;Mahdi-Ahmed and Chiron, 2020;Seid-Mohammadi et al 2019;Malakootian and Asadzadeh, 2020). One of the shortfalls associated with the photodegradation method is the fast recombination of formed radicals which reduces the overall efficiency of the process (Malakootian and Asadzadeh, 2020;Chakraborty and Abraham, 2017;Lee and Kim, 2023). Other investigations on the removal of cefixime are available on the conventional approach with inherent limitation of regeneration of catalyst and disposal of secondary solid waste generated during the process (Lee and Kim, 2023;Anandan et al, 2020;Li et al 2017).…”

“…One of the shortfalls associated with the photodegradation method is the fast recombination of formed radicals which reduces the overall efficiency of the process (Malakootian and Asadzadeh, 2020;Chakraborty and Abraham, 2017;Lee and Kim, 2023). Other investigations on the removal of cefixime are available on the conventional approach with inherent limitation of regeneration of catalyst and disposal of secondary solid waste generated during the process (Lee and Kim, 2023;Anandan et al, 2020;Li et al 2017).…”