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

Nowadays, one important environmental problem is the pollution from dyes that obtains from industry activities. The adsorption of pollutant by new and useful materials has been studied by scientist. In this research, P-doped graphitic carbon nitride was prepared by the facile strategy with phosphoric acid and melamine. The characterization of the P-doped graphitic carbon nitride (P-g-C3N4) was determined by FT-IR, XRD, SEM, and BET analysis. This preparation method was simple, easy and efficient strategy 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 R2 value of 0.98. The maximum adsorption capacity (qmax) from the Langmuir isotherm was determined 100 mg/g when pH, adsorbent dosage, initial concentration of methylene blue, contact time are 8, 0.07 g, 8 ppm and 60 min at 18 ᴼC. The adsorption on the P-doped graphitic nitride matched pseudo-second order model. These findings suggest it as an efficient material to adsorb methylene blue.