英语论文网

尽管采用纳米材料对有机污染物光催化氧化降解的反应历程极其复杂，涉及的中间体种类多，因反应条件各异其产物也不尽相同，但整个降解过程一般都非常彻底，最终生成CO2、H2O和一些简单的无机物。

Despite the use of nanomaterials on the photocatalytic degradation of organic pollutants in the reaction process is extremely complex, involving many kinds of intermediates , reaction conditions vary because its products are not the same , but the whole process of degradation are generally very thorough , and ultimately generate CO2, H2O and some simple inorganic substances.

其中，纳米TiO2由于具有抗化学和光腐蚀、性质稳定、无毒、催化活性高、价廉等优点而最受重视和具有广阔的应用前景。提高TiO2的催化效率成为众多研究者研究的重点。

Among them, the nano-TiO2 as with anti- corrosion chemical and light , stable, non-toxic, high catalytic activity, low cost and the advantages of the most valued and has broad application prospects. Improve the catalytic efficiency of TiO2 become the focus of many researchers study .

拓展TiO2的禁带宽度是研究人员研究的一个重点。TiO2是宽带隙半导体（3.2Ev），只能利用约占太阳光3% ～ 4%的紫外光（380nm）来诱发光催化反应，对太阳光的利用率很低，为了拓宽其光催化剂的光响应范围， 改善其光催化性能，在早期研究人员对其进行一系列的改性。

Expand the band gap of TiO2 is a focus of the researchers studied . TiO2 is a wide band gap semiconductor (3.2Ev), sunlight only use about 3% to 4 % of the UV light (380nm) to induce the photocatalytic reaction , low utilization of sunlight , in order to broaden their photocatalyst response range , to improve the photocatalytic activity , researchers in the early modification of its range . Such as metal (V, Fe, Mn) -modified TiO2, metallic (C, S, N) and the use of polymer -modified TiO2 modified . While modification can be improved by the band gap of TiO2 , improve the utilization of sunlight , but the modified TiO2 poor stability , catalytic activity of other issues. Expand the band gap and improve the stability of TiO2 become researchers new issues. Currently perovskite-type oxides such as tantalum salts and titanate , because in the ultraviolet and visible light have high photocatalytic activity of people's attention .

另外，选择合适的反应载体也是研究的重点。选择各种载体负载催化粒子，增大了催化剂的有效比表面， 因而提高了处理效果。提高有效催化粒子数， 增加具有深度氧化性的活性羟基数。

In addition, select the appropriate focus of the study is the reaction of the carrier . Select various carrier-supported catalyst particles , increasing the effective surface area of the catalyst , thus increasing the treatment effect. Increase the effective catalytic particles , increasing with the depth of oxidizing reactive hydroxyl number. In addition to considering increasing the effective surface area, uniform dispersion of TiO2 in the reaction to the support carrier is selected as an important factor in the reaction . Currently popular in the activated carbon , steel , polymers , SiO2, Fe3O4, glass , carbon fiber and graphite layer supported on a support such as TiO2 films .

A hot research topic in recent years is the structure and morphology of TiO2 for its catalytic performance. 2001 Researchers prepare highly ordered TiO2 nanotube arrays . After researchers who began to study the structure and morphology of TiO2 for its catalytic performance. For the same solution , TiO2 structure different catalytic properties there is a difference . For example, methylene blue solution , anatase TiO2 nanotubes have the best catalytic activity. While for the same solution , TiO2 nanotubes same structure , the different lengths of different diameters is not the same catalytic properties . The same is methylene blue solution , anatase Ti本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。