Fe-Cu催化还原法处理硝基苯类化合物废水

Treatment of Nitrobenzene Compounds Wastewater by Catalyzed Fe-Cu Process

以硝基苯、4-氯硝基苯、4-硝基苯酚与2-硝基苯酚为目标污染物,对比了铁单独处理和铁铜联合处理的效果,并研究了硝基苯与4-氯硝基苯、4-硝基苯酚、2-硝基苯酚双组分混合以及2-硝基苯酚与4-硝基苯酚双组分混合状态下,Fe-Cu催化还原体系降解各组分的效果和相互影响.结果表明:铜可以催化铁屑法对硝基苯的还原;无论是单一组分还是混合状态下,硝基苯类化合物的催化还原降解反应均符合准一级反应动力学;除2-硝基苯酚以外,其他硝基苯类化合物均是以混合状态存在时催化降解速率比其单独存在时的慢;在双组分混合溶液中,另一种化合物对硝基苯催化还原降解产生的抑制作用大小为:2-硝基苯酚>4-硝基苯酚>4-氯硝基苯.化合物的扩散速率越快,表面反应速率越慢时,它对混合溶液中其他共存硝基苯类化合物的催化还原反应速率抑制作用越大.

Nitrobenzene （NB）, 4-chloro-nitrobenzene （4-C1NB）, 4-nitrophenol （4-NP）, 2-nitrophenol （2-NP） are selected as target contaminants in this paper. Experiments were conducted to compare the degradation effect of nitrobenzene compounds （NBCs） in single-existence condition by the catalyzed Fe-Cu and iron scraps processes. The degradation effect and interaction of every nitrobenzene compound in coexistence condition of NB and 4-C1NB, 4-NP, 2-NP, as well as 2-NP and 4-NP by the catalyzed Fe-Cu process were also studied. The results show that the application of copper catalyzes the reduction degradation of NBCs by the iron scraps. Every nitrobenzene compound reduction by the catalyzed Fe-Cu process is pseudo first order both in single-existence and coexistence conditions. Except for 2-NP, the catalyzed degradation rate of other NBCs is slower in coexistence than in single-existence condition. In two-component mixture, the hindered effect of another compound on NB catalyzed reduction decreases in the following order： 2-NP〉4-NP〉4-C1NB. The faster diffusion rate and slower surface reaction rate of a nitrobenzene compound lead to a greater inhibition of itself on other NBCs degradation in mixing solution by the catalyzed Fe-Cu process.