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Abstract: A novel surface molecular imprinted material based on modification of potassium tetratitanate whisker has been successfully synthesized with dibenzothiophene(DBT) as template, 4-vinyl pyridine (4-VP) as functional monomer, potassium tetratitanate whisker (K2Ti4O9) as carrier. The synthetic sorbents were characterized by using the Fourier transform infrared spectroscopy, scanning electron microscopy and nitrogen adsorption. The adsorption conditions and properties of surface-imprinted/K2Ti4O9(MIP/K2Ti4O9) for selectivity of DBT were investigated. The experimental results showed that the optimum adsorption temperature was 318 K and adsorption time was 240 min. The equilibrium adsorption amount reached 23. 33 mg/g at an initial concentration of 500 mg/L; the adsorption process was described well with pseudo-second-order model, the chemisorption was dominant and the adsorption behavior was explained well with the Freundich isotherm equation, so it was a multi-molecular layer adsorption; the adsorption of DBT onto MIP/K2Ti4O9 was a spontaneous, endothermic and entropy-driven process. Selective adsorption test indicated that the MIP/K2Ti4O9 was a more effective sorbent than non-imprinted/K2Ti4O9(NIP/K2Ti4O9) toward DBT
Template and target information: dibenzothiophene, DBT
Author keywords: Surface-imprinted, dibenzothiophene, Potassium tetratitanate whisker, gas chromatography