Preparation of polyhydroquinone graphene oxide nanocomposite for cephalexin removal from water by adsorption: Simulation, kinetics, and thermodynamic studies

Abstract

Polyhydroquinone graphene oxide nanocomposite was produced and characterized by spectroscopic procedures. This substance was used to eliminate the antibiotic cephalexin from the water. With an initial amount of 700.0 g/L, a dose of 1.0 g/L, 60 min of contact time, and a temperature of 25 °C, the removal percentage was 90.0. Following the Langmuir, Temkin, and D-Rs models were the experimental data. A kinetic model with a pseudo-first order was used to govern the kinetic. At 20, 25, and 30 °C, free energy magnitudes were −47.28, −48.10, and −48.90 kJ/mol. Entropy and enthalpy had values of −0.063 and −0.21 kJ/mol. Thermodynamic parameter values that are negative are a sign of a spontaneous sorption process. Cephalexin's physical sorption on the polymeric polyhydroquinone graphene oxide nanocomposite sorbent was confirmed by the simulation investigation. Cephalexin bound to polymeric polyhydroquinone graphene oxide nanocomposite with a −3.5 kcal/mole binding energy. This technique can be used to remove cephalexin on a wide scale since it is reasonable and eliminates 90 % of cephalexin.