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| Effects of cations on the adsorption kinetics of Bt protein on mineral surfaces |
| Received:February 16, 2017 |
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| KeyWord:adsorption kinetics;minerals;cations |
| Author Name | Affiliation | E-mail | | CHENG Fang-yuan | Tianjin Engineering and Technology Research Center of Agricultural Products Processing, College of Food Science and Bioengineering, Tianjin Agriculture University, Tianjin 300384, China | | | ZHOU Xue-yong | Tianjin Engineering and Technology Research Center of Agricultural Products Processing, College of Food Science and Bioengineering, Tianjin Agriculture University, Tianjin 300384, China | zhouxueyongts@163.com | | ZHANG Jia-chen | Tianjin Engineering and Technology Research Center of Agricultural Products Processing, College of Food Science and Bioengineering, Tianjin Agriculture University, Tianjin 300384, China | | | LU Ling-lan | Tianjin Institute of Pesticides, Tianjin 300400, China | | | MA Jin-ming | Tianjin Institute of Pesticides, Tianjin 300400, China | |
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| Abstract: |
| In order to better understand the influence of metal cations on the adsorption kinetics of Bacillus thuringiensis(Bt) protein on mineral surfaces, four types of minerals(montmorillonite, kaolinite, attapulgite, and calcium carbonate) were studied. The concentration of Na+, K+, Mg2+, and Ca2+ was adjusted to 1 mmol·L-1, and the adsorption kinetics of Bt protein on the mineral surfaces were investigated using a static adsorption method. The kinetic data were analyzed and fitted to four models(first-order kinetics, second-order kinetics, internal diffusion, and Elovich), and the models were evaluated using the correlation coefficient and the fitted adsorption capacity. The adsorption of Bt protein was enhanced by Na+, K+, Mg2+, and Ca2+, in the following order:Ca2+ > Mg2+ > K+ > Na+. The second-order kinetic model showed a high correlation coefficient(R2>0.995 1), and the quantity of equilibrium adsorption calculated using the model was concordant with measured values. This model was chosen to describe the kinetic characteristics. The R2 value of the Elovich model ranged from 0.914 1 to 0.982 9, indicating that the Elovich model can be used to describe the adsorption kinetics. The R2 value of the first-order kinetic model ranged from 0.710 8 to 0.987 6, making it unsuitable to describe the adsorption kinetics, due to the wide distribution of R2 and the large discrepancy between modeled and measured values for adsorption quantities. The internal diffusion model was not recommended to describe the adsorption kinetics of Bt protein due to the low correlation coefficient(R2>0.619 4). |
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