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研究了ＮＯ－２ 离子在ＴｉＯ２ 表面的光催化反应． 结果表明，体系ｐＨ值升高及Ｃｒ（ Ⅵ） ，Ｃｌ－ ，ＳＯ２ －４ 离子的加入均对ＮＯ－２ 离子在ＴｉＯ２ 表面的暗态吸附产生抑制作用，而ＮＯ－２ 在ＴｉＯ２ 表面的光照反应转化率则随ｐＨ值的升高出现先减小后增大的总体变化趋势．ＳＯ２ －４ 对反应具有明显的协同作用．Ｃｒ（Ⅵ） 在强酸性条件下促进反应，ｐＨ＞ ５ 时则抑制反应进行．Ｃｌ－ 对反应具有一定的抑制作用，但与Ｃｒ（Ⅵ） 共存时，二者对反应的抑制作用明显减弱． 该反应具有比较特别的动力学规律，反应为零级反应，但反应速率却与ＮＯ－２ 的初始浓度相关．
The photocatalytic reaction of NO-2 on the surface of TiO2 was studied. The results showed that both the increase of pH value and the addition of Cr (Ⅵ), Cl- and SO2-4 ions all inhibited the dark-state adsorption of NO-2 on TiO2 surface. However, the photoluminescence of NO-2 on TiO2 surface With the increase of pH, the conversion rate first decreased and then increased, the overall trend. SO2 -4 has a significant synergistic effect on the reaction. Cr (Ⅵ) promoted the reaction under strongly acidic conditions, and inhibited the reaction at pH> 5. Cl- has a certain inhibitory effect on the reaction, but when Cr (Ⅵ) coexist, the inhibitory effect on the reaction is obviously weakened. The reaction has a more specific kinetic law, the reaction is zero-order reaction, but the reaction rate is related to the initial concentration of NO-2.