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Abstract: Surface molecular imprinting is an effective measure to get adsorbent materials for definite substances. In this work, ordered mesoporous carbon nanospheres (OMCNS) were prepared as carriers by a hydrothermal method with phenolic resol as the carbon source and triblock copolymer Pluronic PF127 as the soft template. A surface molecularly imprinted polymer (SMIP/OMCNS) was then obtained through a series of functionalization, grafting and elution processes with dibenzothiophene (DBT) as a template, which was designed for the deep desulfurization of fuel products by removing DBT and its derivatives. By adopting OMCNS as a carrier, SMIP/OMCNS shows excellent adsorption capacity towards DBT (218.29 mg g-1), owing to the ordered mesoporous structure and high surface area of OMCNS. The better fitted pseudo-first-order model indicates that the adsorption involves mainly physical interactions, which are promoted by the mesoporous structure of OMCNS. The Langmuir and Freundlich models fitted better than the Dubinin-Radushkevich and Scatchard isothermal models did, which suggests the occurrence of both monolayer and multilayer interactions. The thermodynamics, selectivity and regenerability of SMIP/OMCNS were also investigated. The adsorption of DBT on SMIP/OMCNS proves to be an endothermic process. And the relative selectivity coefficients against benzothiophene, biphenyl and fluorine interferents reached 2.19, 2.29 and 2.37, respectively. As a result, SMIP/OMCNS can be a potential adsorbent material for deep desulfurization of fuel products and recovering DBT and its derivatives as valuable reagents for other value-added applications
Template and target information: dibenzothiophene, DBT