科研之友
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摘要
The adsorption thermodynamics of Cry1Ab toxin of Bacillus thuringiensis (Bt) in Chinese latosol was studied. The adsorption isotherms of Cry1 Ab toxin followed Langmuir equation (R-2 > 0.98) and the curves belonged to L type. The adsorption increased with the increased temperature and the maximum adsorption amount between 283 and 313 K ranged from 4.50 x 10(-6) to 7.55 x 10(-6) mol g(-1). The results show that the environmental risk of Cry1Ab toxin in Chinese latosol probably enhances if temperature increases. The adsorption of Cry1Ab toxin in Chinese latosol was a spontaneous, endothermic and entropy-increasing process. The separation factor ranged from 0.1865 to 0.4682, indicating that the adsorption of Cry1Ab toxin in Chinese latosol was favourable. The adsorption energy for Cry1Ab toxin ranged from 8 to 16 kJ mol(-1), indicating that it was an ion-exchange mechanism.
