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g-C 3 N 4 , a typical 2D material, has been developed as a promising desulfurization adsorbent, and the effect of preparation temperature on the adsorption performance was investigated here. Mesoporous g-C 3 N 4  was synthesized by a hard template method with gel silica as the template agent. The precursor powder was heat-treated for 4 h at different temperatures (500°C, 550°C and 600°C), respectively, named CN-500, CN-550 and CN-600. UV-Vis spectra and X-ray photoelectron spectroscopy spectra prove CN-500 is composed of triazine g-C 3 N 4 , whereas CN-600 is partially composed of tri-s-triazine g-C 3 N 4 . The max adsorption capacity of CN-600 toward thiophene (TP) is up to 40.82 mg S/g in an isooctane solution, while CN-500 with the maximum specific surface area of 176.5 m 2 /g shows better selectivity but a smaller adsorption capacity. The robust adsorptive performance of mesoporous g-C 3 N 4  is attributed to the D-A (Donor–Acceptor) interactions between adsorbent and TP, which could be interfered by the  π – π  interactions or steric effect, leading to a variable adsorptive capacity or selectivity towards TP and its analogs.

Mesoporous graphitic carbon nitride for adsorptive desulfurization in an isooctane solution