Preparation and vanillin adsorption performance of hyper-cross-linked resin
Using polyvinyl alcohol,divinylbenzene and ethylene glycol dimethacrylate as raw materials,four different resins were prepared as adsorption medium for vanillin by suspension polymerization and suspension double bond post-crosslinking method using different pore-making agents,and evaluated for their vanillin adsorption performance,of which the one with the highest equilibrium vanillin adsorption capacity was selected.Its structure composition and surface morphology were characterized by FTIR,XPS and SEM,while its static adsorption behavior in vanillin aqueous solution was analyzed from the aspects of adsorption thermodynamics and kinetics,with its adsorption stability in the adsorption-desorption cycle further assessed.The results showed that the post-cross-linked polydivinylbenzene-co-ethyleneglycol-dimethacrylate(PCL-PDE)resin prepared using toluene as pore-making agent exhibited the highest adsorption performance for vanillin.Under the conditions of adsorption temperature 25℃and initial mass concentration of vanillin solution 1.0 g/L,the equilibrium adsorption capacity of PCL-PDE for vanillin reached as high as 79.3 mg/g wet PCL-PDE.The adsorption process of vanillin by PCL-PDE was a fast and then slow spontaneous(ΔG<0)and exothermic(ΔH<0)physical process,reaching adsorption equilibrium within 180 min.The adsorption performance of PCL-PDE remained stable during 5 cycles of adsorption-desorption.
万方数据
维普
