文章摘要
程方圆,周学永,张家琛,鲁伶兰,马锦明.阳离子对Bt蛋白在矿物表面吸附动力学的影响[J].农业环境科学学报,2017,36(9):1844-1849.
阳离子对Bt蛋白在矿物表面吸附动力学的影响
Effects of cations on the adsorption kinetics of Bt protein on mineral surfaces
投稿时间:2017-02-16  
DOI:10.11654/jaes.2017-0172
中文关键词: 吸附动力学  矿物  阳离子
英文关键词: adsorption kinetics  minerals  cations
基金项目:国家自然科学基金项目(31470573,31070478)
作者单位E-mail
程方圆 天津市农副产品深加工技术工程中心, 天津农学院食品科学与生物工程学院, 天津 300384  
周学永 天津市农副产品深加工技术工程中心, 天津农学院食品科学与生物工程学院, 天津 300384 zhouxueyongts@163.com 
张家琛 天津市农副产品深加工技术工程中心, 天津农学院食品科学与生物工程学院, 天津 300384  
鲁伶兰 天津市农药研究所, 天津 300400  
马锦明 天津市农药研究所, 天津 300400  
摘要点击次数: 1924
全文下载次数: 2240
中文摘要:
      为了探讨金属阳离子对Bt蛋白在矿物表面吸附动力学的影响,选取蒙脱石、高岭石、凹凸棒石和碳酸钙四种不同类型的矿物,在Na+、K+、Mg2+、Ca2+添加浓度均为1 mmol·L-1的条件下,采用静态吸附法研究Bt蛋白的吸附动力学特征,并采用一级动力学、二级动力学、内扩散和Elovich四种模型对动力学数据进行拟合,依据相关系数和拟合吸附量对模型优劣进行评价。结果表明,Na+、K+、Mg2+、Ca2+均对Bt蛋白的吸附有促进作用,其作用强弱依次为Ca2+ > Mg2+ > K+ > Na+。模型分析结果表明:二级动力学模型R2>0.995 1,由拟合模型计算得出的平衡吸附量与实测值吻合,因此适合描述Bt蛋白的吸附动力学特征;Elovich 模型R2在0.914 1~0.982 9之间,也能够较好描述矿物对Bt蛋白的吸附特性;一级动力学模型R2在0.710 8~0.987 6之间,相关系数分布范围过宽,且由模型计算得出的平衡吸附量与实测值差异较大,故不适合用于动力学特征描述;内扩散模型相关系数低(R2>0.619 4),不建议在Bt蛋白吸附动力学中使用。
英文摘要:
      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).
HTML    查看全文   查看/发表评论  下载PDF阅读器