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Studies of organic destruction in thin-film and granule titanium dioxide photocatalyst.

机译：薄膜和颗粒状二氧化钛光催化剂中有机物破坏的研究。

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摘要

This study was designed to develop materials to be used as a photocatalyst for the destruction of organic contaminants. Two types of TiO2-based material were studied: thin-film TiO2 immobilized on a flat substrate and granule with TiO2 immobilized in its pores. The materials provide superior engineering properties over powder TiO 2 traditionally used in slurry photocatalytic process. This improvement overcomes the two most common and serious problems associated with the powder TiO2: shadowing effect at high TiO2 concentration, and poor settleability of powder TiO2.; The immobilization of TiO2 on a solid carrier introduces several mechanisms not normally found in conventional TiO2 slurry process. These mechanisms have been identified to include at least film transfer, adsorption, diffusion, and photocatalytic reaction. Two mathematical models, called thin-film model and granule model, were developed to incorporate these mechanisms for the photodegradation of organic molecules in a batch reactor. A numerical technique, i.e., orthogonal collocation method (OCM), was employed to solve the models. The OCM used six internal collocation points and applied Legendre polynomial to approximate the profile of solid concentration. The models were then coded and compiled using FORTRAN for simulation.; The results of this study indicated that both thin-film and granular TiO2 photocatalyst are suitable for the destruction of organic contaminants. Mathematical models developed in this study successfully incorporated several key mechanisms governing the process such as liquid-film transfer, intraparticle diffusion, adsorption, UV attenuation, and photocatalytic degradation. The study revealed that adsorption plays a key role in these photocatalytic processes. Model simulations provided valuable insights into the effect of process mechanisms, as well as their interactions. The results also pointed to possible ways to improve the performance of a TiO2-based composite catalyst.
机译：这项研究旨在开发用作破坏有机污染物的光催化剂的材料。研究了两种类型的TiO2基材料：固定在平坦基材上的薄膜TiO2和固定在其孔中的TiO2颗粒。与传统上用于浆料光催化工艺的TiO 2粉末相比，该材料具有出色的工程性能。这项改进克服了与TiO2粉末有关的两个最普遍和严重的问题：高TiO2浓度时的遮蔽效应和较差的TiO2沉降性。将TiO2固定在固体载体上引入了常规TiO2浆料工艺中通常不存在的几种机理。已经确定这些机制至少包括膜转移，吸附，扩散和光催化反应。开发了两个数学模型，分别称为薄膜模型和颗粒模型，以将这些机制用于间歇式反应器中有机分子的光降解。使用数值技术，即正交配置法（OCM）来求解模型。 OCM使用六个内部搭配点，并应用了Legendre多项式来近似固体浓度分布。然后使用FORTRAN对模型进行编码和编译以进行仿真。这项研究的结果表明，薄膜和颗粒状TiO2光催化剂都适合破坏有机污染物。在这项研究中开发的数学模型成功地纳入了控制该过程的几个关键机制，例如液膜转移，颗粒内扩散，吸附，紫外线衰减和光催化降解。研究表明，吸附在这些光催化过程中起着关键作用。模型仿真为过程机制的效果及其相互作用提供了宝贵的见解。结果还指出了改善TiO2基复合催化剂性能的可能方法。

著录项

  • 作者

    Wu, Nan-Min.;

  • 作者单位

    Illinois Institute of Technology.;

  • 授予单位 Illinois Institute of Technology.;
  • 学科 Engineering Chemical.; Engineering Environmental.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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