Highly efficient adsorption of tetracycline from aqueous solution using cobalt sulphide (CoS) nanoparticles

Surfaces of cobalt sulphide (CoS) nanoparticles have high electron density that could interact with polycyclic aromatic compounds by π-π stacking. The CoS was synthesized via hydrothermal method and characterized by field emission scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray. Using tetracycline as a model analyte, the batch adsorption experiments were carried out in order to investigate the adsorption capacity of the adsorbent. It was revealed that pseudo-second-order kinetic model can better describe the adsorption kinetic. Furthermore, the equilibrium adsorption data were congruous with the model Langmuir with maximum adsorption capacity of 163.93 mg g-1.