新型光催化反应器降解典型有机污染物2,4-二硝基苯酚

Study on Degradation of a Typical Contaminant 2,4 DNP with a New Type Photocatalytic Reactor

利用ＴｉＯ２在Ｈ２Ｏ２中的溶解性，在玻璃表面形成ＴｉＯ２薄膜，制作了新型环状光催化型反应器。以２，４－二硝基苯酚为典型有机化合物，进行了降解的条件研究，并测试了反应器性能。分别考察了催化剂涂层载体、光源、搅拌以及流速对２，４－二硝基苯酚光降解的效率。结果表明：石英玻璃为最理想的光催化剂载体；水银灯对２，４－二硝基苯酚的降解速度最快，是理想的光源；搅拌能够提高反应器效率；采用适宜的流速（４５ｍｌ／ｍｉｎ）可使反应器效率达到理想值。在反应动力学研究中，２，４－二硝基苯酚的最大降解速率为Ｋｄｍａｘ＝０．３６ｍｇ／（Ｌｍｉｎ），最终的降解率达到９９．５％．

In this paper, the photodegradation of the typical organic contaminant, 2,4 dinitrophenol (2,4 DNP), was studied in a new type photocatalytic reactor. The conditions including catalyzer (TiO 2) carrier, lamp house and velocity of flow were tested,and the results showed that quartz glass, mercury lamp and moderate velocity of flow (45 mL/min) were optimum, respectively; and the mixture of circular influent could accelerate the reaction process. In the study of degradation kinetics of 2,4 DNP, the maximum velocity (Kd max =0.36 mg/(L·min) and ratio (99.5%) of degradation were also obtained.