• WALEED K. ABDULSAHIB Pharmacology and Toxicology Department, College of Pharmacy, Al-Farahidi University, Baghdad, Iraq
  • SAFAA H. GANDUH Pharmacology and Toxicology Department, College of Pharmacy, University of Al-Qadisiyah, Al-Qadisiyah, Iraq
  • MAKARIM A. MAHDI Department of Chemistry, College of Education, University of Al-Qadisiyah, Al-Qadisiyah, Iraq
  • LAYTH S. JASIM Department of Chemistry, College of Education, University of Al-Qadisiyah, Al-Qadisiyah, Iraq


Objective: Preparation of novel, safe, and low-cost composite by addition of graphene oxide (GO) to polyvinylpyrrolidone-acrylic acid composite (PVP-AAc) to remove the doxycycline hydrochloride (D) from polluted aquatic environment.

Methods: Different concentrations of D were used to study the adsorption process of the antibiotic on the surface of GO/(PVP-AAc) hydrogel composite. The aquatic solution of D was used for studying the adsorption process through a series of different experiments to determine the contact time, adsorbate amount, appropriate temperature, the preferred pH, ionic strength, adsorption kinetics and isotherms on the adsorbent surface of GO/PVP-AAc composite. Fourier transform infrared (FT-IR) spectroscopy and Field-emission scanning electron microscopy (FE-SEM) were used to detect the structure, functional groups and surface morphology of the composite before and after D adsorption.

Results: Doxycycline is adsorb on the surface of GO/PVP-AAc hydrogel composite through by physical interactions. The adsorption kinetics correlated to the pseudo-second-order model, contact time studies of D equal to 180 min and the high R2 value of 0.98 indicates that Langmuir isotherm model better fitted to the data for the removal of D at 15 °C. The results of thermodynamic parameters show that the nature of the adsorption process is physical, exothermic, orderly and spontaneous. The adsorption capacity of D favors the acidic media. When NaCl is added to the solution, the adsorption capacity of D will increase.

Conclusion: Graphene oxide/PVP-AAc composite is a novel, worthy and efficient adsorbent for the removal of the doxycycline polluted the water because of its low cost, hydrophilic properties, large surface area and special structure that give impressive dispersible activity in aquatic solutions.

Keywords: Doxycycline, Adsorption, Graphene oxide, Composite and removal


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