Hollow MOFs, utilizing large cavities (>50 nm) and hierarchical pores, significantly enhance mass transfer kinetics and site accessibility, thereby outperforming conventional microporous (2-ZIF-8@Ni/Co-BTC composite was successfully fabricated, demonstrating markedly superior performance for adsorptive desulfurization. Batch adsorption tests indicate a saturated uptake of ∼90 mg/g for thiophenic sulfur (Th-S) compounds under ambient conditions. The kinetic data obey a pseudo-second-order model, and the adsorption equilibrium is well-fitted by the Freundlich isotherm, consistent with a multilayer adsorption mechanism. The composite retains high selectivity for Th-S against representative aromatic and olefinic competitors and maintains approximately 85% of its initial adsorption capacity over repeated cycles without significant structural degradation. Integrated experimental characterization and density functional theory (DFT) simulations elucidate the coexistence of multiple complementary adsorption mechanisms. The exceptional performance arises from a synergistic interplay: (i) strong S-M (M = Ni, Co, Zn) coordination bonds form between the multimetal sites and the Th-S sulfur atom; (ii) enhanced affinity via π-π stacking interactions between the aromatic moieties of the MOF linkers and the Th-S ring; and (iii) additional stabilization through N-H···S hydrogen bonding provided by the amino functionalities of NH2-ZIF-8. This architecture successfully achieves a balance of high capacity, high selectivity, and high stability. Consequently, this study furnishes a viable material design blueprint and valuable theoretical guidance for progressing adsorptive desulfurization toward practical implementation in clean fuel manufacturing.
Yu et al. (Thu,) studied this question.
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