Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants
Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants
复制标题
DOI：
10.1016/s0920-5861(99)00107-8
复制
发表时间：
1999-10-15
期刊：
影响因子：
5.3
通讯作者：
Herrmann, JM
中科院分区：
文献类型：
--
作者：
Herrmann, JM
光催化是基于光催化剂（主要是二氧化钛）同时吸附两种反应物和吸收有效光子的双重能力。的基本原理，以及主要参数的影响，支配的动力学（催化剂的质量，波长，初始浓度，温度和辐射通量）进行了描述。除了在气相或液相中对有机物进行选择性温和氧化外，在水中，由于光生OH（.）通过正性光空穴中和OH（-）表面基团来产生自由基。许多有机物可以被完全降解并矿化为CO（2）和无害的无机阴离子。任何试图通过贵金属沉积或离子掺杂来提高TiO 2光活性的尝试都是有害的。同时，重有毒金属离子（Hg（2+）、Ag（+）、贵金属）可以通过在二氧化钛上的光沉积从水中去除。一些水解毒光催化装置已经商业化。太阳能平台正在使用大型试验性光反应器，其中降解的污染物的量子产率与实验室中使用人造光确定的量子产率相当。(C)1999 Elsevier Science B. V.保留所有权利。
Photocatalysis is based on the double aptitude of the photocatalyst (essentially titania) to simultaneously adsorb both reactants and to absorb efficient photons. The basic fundamental principles are described as well as the influence of the main parameters governing the kinetics (mass of catalyst, wavelength, initial concentration, temperature and radiant flux). Besides the selective mild oxidation of organics performed in gas or liquid organic phase, W-irradiated titania becomes a total oxidation catalyst once in water because of the photogeneration of OH(.) radicals by neutralization of OH(-) surface groups by positive photo-holes. A large variety of organics could be totally degraded and mineralized into CO(2) and harmless inorganic anions, Any attempt of improving titania's photoactivity by noble metal deposition or ion-doping was detrimental. In parallel, heavy toxic metal ions (Hg(2+), Ag(+), noble metals) can be removed from water by photodeposition on titania. Several water-detoxification photocatalytic devices have already been commercialized. Solar platforms are working with large-scale pilot photoreactors, in which are degraded pollutants with quantum yields comparable to those determined in the laboratory with artificial light. (C) 1999 Elsevier Science B.V. All rights reserved.