中文摘要：

研究了反库斯塔克亚种（kurstaki）毒素（65kDa）在高岭土、针铁矿和氧化硅表面的吸附和解吸特性．结果表明：在磷酸盐缓冲体系（pH8）中，3种矿物的等温吸附曲线均符合Langmuir方程（R^2〉0．9661），它们对反毒素的吸附顺序为：针铁矿〉高岭土〉二氧化硅．矿物对Bt毒素的吸附1h就基本达到了吸附平衡．在pH6～8范围内，针铁矿、高岭土和二氧化硅对Bt毒素的吸附量随pH值的升高而降低．10℃～50℃范围内，针铁矿和氧化硅对反毒素吸附量随温度升高有所下降（8．39％和47．06％），高岭土对反毒素吸附则略有升高（5．91％）．红外光谱分析显示，Bt毒素被矿物吸附后结构仅有微小变化．被矿物吸附的Bt毒素不易被去离子水解吸，水洗3次总解吸率为28．48％～42．04％．

英文摘要：

This paper studied the characteristics of the adsorption and desorption of Bt （Bacillus thuringiensis） toxin on goethite, kaolinite, and silica. The results showed that in phosphate buffer （pH 8 ）, the adsorption isotherms of Bt toxin on the test minerals followed Langmuir equation （R2 〉0. 9661 ）, and the adsorbed amounts were in the order of goethite 〉 kaolinite 〉 silica. The Bt toxin was easily adsorbed on the minerals, and the adsorption could reach equilibrium after 1 hour. Within the range of pH 6-8, the amounts of Bt toxin adsorbed on goethite, kaolinite and silica decreased with increasing pH ; in the range of 10 ℃-50 ℃, the amounts of the toxin adsorbed on goethite and silica decreased by 8.39% and 47.06%, respectively, while that on kaolinite increased slightly （5.91% ）. The infrared absorption spectrum showed that there was only a minor alteration of Bt toxin after adsorption. The toxin adsorbed on the minerals was not easily desorbed by deionised water, with the desorption rate ranged from 28.48% to 42. 04% after three times washing.