• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Chemometrics >Nonlinear modelling of data in photomineralization kinetics of organic micropollutants by photocatalytic membranes immobilizing titanium dioxide in membrane reactors
【24h】

Nonlinear modelling of data in photomineralization kinetics of organic micropollutants by photocatalytic membranes immobilizing titanium dioxide in membrane reactors

机译：用光催化膜固定膜反应器中的二氧化钛的有机微拷贝的光催化膜中的有机微量胶质型动力学数据的非线性建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Kinetic fitting of substrate disappearance and of total organic carbon (TOC) mineralization of organic micropollutants, in water and air, by photocatalytic membranes immobilizing titanium dioxide, was carried out. A model was used in which mineralization of substrate to CO2 is supposed to occur, with kinetic constant k1, through one single intermediate, mediating the behaviour of all the numerous real intermediates formed in the path to CO2, kinetic constant of formation of the latter being k2. A competitive Langmuirian-type adsorption of both substrate and 'intermediate' was also supposed to be operative, as expressed by pseudo-thermodynamic constants K1 and K2 respectively, these constants possessing a, partly at least, kinetic significance. Nonlinear models could be fitted to data by using the least-squares method. The very satisfactory matching is shown for the laboratory-scale mineralization kinetics of methane, as model molecule of aliphatic contaminants, both in the gas phase and in aqueous solution. Furthermore, in pilot plant experiments, using phenol, as model molecule of aromatics, modelling of quantum yields was carried out, as a function of concentration and of adsorbed radiant power. Kinetics of hydroxyl radicals reacting between themselves, leading to hydrogen peroxide, other than with substrate or intermediates leading to mineralization, was considered, paralleled by a second competition kinetics due to superoxide anion radical and its conjugate acid, equally leading to mineralization. In this model the contribution of hydroxyl radicals to mineralization decreases with irradiance, while the contribution of superoxide anion radical and its conjugate acid increases. If the regression equations of these two contributions are considered together, in a linear combination, the surface model perfectly fits the experimental data.
机译：进行了基材消失和总有机碳（TOC）矿化的动力学拟合有机微拷贝，在水和空气中，通过固定二氧化钛的光催化膜，在水和空气中进行。使用模型，其中基质对CO 2的矿化应该通过动力学常数K1，通过一个单一中间体，介导在CO2的路径中形成的所有许多实际中间体的行为，后者的形成动力学常数K2。族碱和“中间体”的竞争性Langmuirian型吸附也应该是可操作的，如伪热动力常数K1和K2表达，这些常数具有，部分至少是动力学意义。可以通过使用最小二乘法将非线性模型装配到数据。甲烷的实验室型矿化动力学显示了非常令人满意的匹配，作为气相和水溶液中的脂族污染物的模型分子。此外，在试验厂实验中，使用苯酚作为芳烃的模型分子，进行量子产率的建模，作为浓度和吸附辐射动力的函数。考虑了羟基自由基的动力学，导致过氧化氢，除了导致矿化的底物或中间体，由导致矿化的底物或中间体相似，由于超氧化物阴离子自由基及其共轭酸等二次竞争动力学，同样导致矿化。在该模型中，羟基自由基对矿化的贡献随着辐照而降低，而超氧化物阴离子自由基及其共轭酸的贡献增加。如果将这两个贡献的回归方程被认为是在线性组合中，表面模型完全适合实验数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号