Preparation of co-schiff base complex and its adsorption desulfurization

Twelve schiff base metal complexes were synthesized, and selected to adsorption desulfurization of dibenzothiophene(DBT). The result showed that the schiff base metal complex of melamine and cobalt (SF-S/Co) was the optimal adsorbent. Then SF-S/Co was characterized by scanning electron microscopy(SEM), Brunner -Emmet -Teller(BET) measurements, fourier transform infrared spectroscopy(FTIR), X-ray diffraction, and energy spectroscopy analysis. The effects of adsorbent amount and adsorption time on adsorption desulfurization were studied. The optimal adsorption condition was 1.5 g adsorbent/100 mL model oil, and the adsorption time was 8 min at room temperature. Under the optimal condition, the adsorption removal rate of DBT is up to 95%. The maximum adsorption capacity of the adsorbent for DBT is 21.66 mg/g. The adsorption capacity of adsorbent didn't decreased obviously after being reused for 5 times. The adsorption isothermal model and dynamics of the adsorption process was further studied. The results show that the adsorption process of DBT by this adsorbent followed the Freundlich adsorption isothermal model and the pseudo-second-order model kinetics. The absorption effect of this adsorbent on different sulfides also was investigated. The order of removal efficiency was: dibenzothiophene > benzothiophene > thiophene.