adsorptive removal of oxytetracycline using polymer coated magnetic nanoparticular activated carbon: synthesis, characterization and adsorption isotherms and kinetics studies

In the presented study, the removal of oxytetracycline (otc) from aqueous solution by adsorption was investigated onto active carbon (ac), magnetic activated carbon (magac), styrene-butadiene-styrene magnetic activated carbon (sbs/magac) and poly charbon magnetic activated carbon (pc/magac). the process optimization was carried out by investigating the effects of ph, temperature, solid-liquid ratio, adsorbent type, and initial concentrations. the data showed that adsorption reached equilibrium in as little as one hour. less adsorption at low ph values and more at approximately 5.0 values. however, all the materials performed well at room temperature when the situation is examined in terms of kinetics. it was also observed that ac, magac, and pc/magac are more effective than sbs/magac and the initial concentration decreased from 100 ppm to 20 ppm with adsorbents. in addition, at lower concentrations, when 25 ppm and 50 ppm were used, it was observed to 2.5 ppm and 5.0 ppm values. the kinetic results presented that the pseudo-second-order model (r² ⩾ 0.99) was more effective than that of the pseudo-first-order model (r² < 0.90). also, the intra-particle kinetic model in the adsorption process exhibited two different stages with the diffusion of inter-particle and external diffusion. adsorption isotherms for all adsorbents were fitted to langmuir models more effectively than freundlich models (r² ⩾ 0.99). thermodynamics parameters were also calculated. it is seen that otc can be removed more easily from the aqueous medium by using magnetic and polymeric materials.