Adsorption desulfurization performances of Zn/Co porous carbons derived from bimetal-organic frameworks

Bimetal porous carbon Zn/Co@C materials derived from bimetal (Zn, Co)-organic frameworks (bi-MOFs) were prepared by a carbonization method in this work. These carbon materials were analyzed by some characterization technologies including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), N-2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Raman spectra, Zeta potential and Boehm titration. The results demonstrated that an optimal carbonization temperature was 800 degrees C. The material prepared under such condition (denoted as Zn/Co@C-800) had good porous structures, uniformly distributed metal active sites, high surface area (531.1 m(2) g(-1)) and large pore volume (0.449 cm(3) g(-1)). In addition, adsorption desulfurization performances of samples for dibenzothiophene (DBT) were systematically investigated and followed an order: Zn/Co@C-800 > Zn@C-800 > Zn/Co@C-600 > Zn/Co@C-700 > Zn/Co@C-900 > Co@C-800. Pseudo second-order kinetic and Langmuir models presented best fitting results of DBT adsorbing on Zn/Co@C-800. The Zn/Co@C-800 exhibited the remarkable adsorption capacity of DBT (40.6 mg g(-1)) due to positive bimetallic synergistic effects.