Li Wei, Wang Yi-zhong
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2004;16(2):328-31.
The relationship between adsorption behavior and photocatalytic mechanism of the two dyes was investigated. Adsorption isotherms showed that the adsorption of cationic pink FG was Langmuir type behavior, while the reactive brilliant red k-2G was Freundlich type behavior. The increasing pH favored the adsorption of FG but have little effect on the photodegradation. The increasing pH favored the adsorption and the photodegradation of k-2G. The presence of scavenger of hvb+ and OH* radical potassium iodide inhibited the degradation of k-2G, free radicals scavenger tetranitromethane inhibited the photodegradation of FG. These results indicated that the photodegradation of FG mainly via free radicals in solution, and the photodegradation of k-2G was mainly on the catalysts surface or near the interface of solid and solution by react with hvb+ and surface-bound OH*. The different effect of SO4(2-), HCO3- on the adsorption and photodegradation of two dyes confirmed these results.
研究了两种染料的吸附行为与光催化机理之间的关系。吸附等温线表明，阳离子桃红FG的吸附为朗缪尔型行为，而活性艳红K-2G为弗伦德利希型行为。pH值升高有利于FG的吸附，但对光降解影响较小。pH值升高有利于K-2G的吸附和光降解。空穴（hvb+）和羟基自由基（OH*）清除剂碘化钾的存在抑制了K-2G的降解，自由基清除剂四硝基甲烷抑制了FG的光降解。这些结果表明，FG的光降解主要通过溶液中的自由基进行，而K-2G的光降解主要是通过与hvb+和表面结合的OH*在催化剂表面或固液界面附近发生反应。SO4(2-)、HCO3-对两种染料吸附和光降解的不同影响证实了这些结果。
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