Abstract
We propose a facile synthesis of phosphorus- and chlorine-co-doped graphitic carbon nitride (g-C3N4) using melamine, ammonium dihydrogen phosphate, and ammonium chloride as precursors. In addition, graphene-like porous g-C3N4 nanosheets were synthesized via direct pyrolysis followed by thermal exfoliation. X-ray diffraction (XRD), N2 adsorption, UV-vis spectroscopy, photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS) were used to characterize the prepared catalysts. The results showed that the introduction of dopants and thermal exfoliation inhibited the crystal growth of g-C3N4, enhanced its surface area, influenced the bandgap energy, and restrained the recombination of photogenerated electrons and holes. P- and Cl-co-doped photocatalysts exhibited much higher rhodamine B (RhB) photodegradation rates than the bulk g-C3N4 catalyst. This study presents a feasible modification method to synthesize g-C3N4-based photocatalysts.
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