The adsorption of VB12 was studied by usingthree phenolic resin adsorbents：JDW-1

JDW-2

preparedin the laboratory and a commercial product Duolite S-761 under static and dymanic conditions．The experimental results show that JDW-1 is superior to Duolite S-761 in adsorption of VB12(the saturation adsorption capacity of JDW-1 for VB12 is 84 mg/g dried resin)．A semi-empirical rate equation adequately fits the sorption rate data of VB12 in the initial period．till about 43％～69％ of the equilibrium adsorption．The equilibrium adsorption date for phenolic resin adsorbents/VB12 systems showed good agreement with the Langmuir isotherm equation．The correlation coefficients are larger than 0.99 The adsorption of VB12 therefore is monomolecular adsorption．Experiments of stripping VB12 from JDW-2 resin with 80％ aqueous methoanol showed that 92.20％and 95.93％ of the adsorbed VB12 were removed at 4.2 and 6.4 bed volumes

respectively

(the desorption rate was 1.1 BV/h)．It implies that phenolic resin adsorbents own excellent desorption performance

and it is good to use 80％ aqueous methanol as desorption solvent for stripping VBl2 from JDW-2