Chemistry

Metallurgy

Materials science

Graphene

Antibiotics

Nanotechnology

Organic chemistry

Chemical engineering

Waste management

Adsorption

Engineering

Oxide

Biochemistry

Ecotoxicology and Environmental Safety

The adsorption behavior of tetracycline (TCN), doxycycline (DCN) as the most common antibiotics in veterinary and ciprofloxacin (CPN) onto graphene oxide nanosheets (GOS) in aqueous solution was evaluated. The four factors influencing the adsorption of antibiotics (initial concentration, pH, temperature and contact time) were studied. The results showed that initial pH ∼ 6 to 7 and contact time ∼ 100 – 200 min are optimum for each drug. The monolayer adsorption capacity was reduced with the increasing temperature from 25 °C to 45 °C. Non-linear regressions were carried out in order to define the best fit model for every system. To do this, eight error functions were applied to predict the optimum model. Among various models, Hill and Toth isotherm models represented the equilibrium adsorption data of antibiotics while the kinetic data were well fitted by pseudo second-order (PSO) kinetic model (DCN and TCN) and Elovich (CPN) models. The maximum adsorption capacity (qmax) is found to be in the following order:...

A comprehensive adsorption study and modeling of antibiotics as a pharmaceutical waste by graphene oxide nanosheets