Preparation of Phosphorus Doped Graphitic Carbon Nitride Using a Simple Method and Its Application for Removing Methylene Blue

Nowadays, dye pollution arising from industrial activities has become an environment issue. Surface adsorption of pollutants seems to be a promising solution for this problem. In this research, P-doped graphitic carbon nitride was prepared by the facile strategy with phosphoric acid and melamine. The characterization of P-doped graphitic carbon nitride (P-g-C3N4) was performed using FT-IR, XRD, SEM and BET analyses. The preparation method was simple, easy and efficient compared to other methods. The as-synthesized P-doped g-C3N4 was applied for the adsorption of methylene blue. The results were analyzed using the isotherms of Langmuir and Freundlich. The best fit was resulted from Langmuir isotherm having an R-2 value of 0.98. The maximum adsorption capacity (q(max)) from the Langmuir isotherm was 100 mg g(-1) when pH, adsorbent dosage, initial concentration of methylene blue, and contact time are 8, 0.07 g, 8 ppm and 60 min at 18 degrees C. The adsorption on the P-doped graphitic nitride matched pseudo-second order model. Based on our findings, P-g-C3N4 could be an efficient material to adsorb methylene blue.