应用循环伏安法和线性扫描伏安法研究水溶液中硝基苯在铜电极上的电还原特性及其电还原为苯胺的中间步骤和反应机理.结果表明:铜电极上硝基苯的还原电位在-0.58V和-1.32V左右(vs.SCE),溶液的酸性和碱性均有益于该还原反应的发生;还原过程伴有反应物吸附现象,当硝基苯浓度较大时,还原过程受传质过程控制;随着厌氧程度的提高,还原速率加快.
The electrochemical reduction characteristics and transition steps of nitrobenzene aqueous solution at the copper electrode, as well as its reduction mechanism were extensively investigatedby using the techniques such as cyclic voltammetry(CV) and linear scan voltammetry(LSV). The results showed that the reduction peaks of nitrobenzene at the copper electrode were located at 0.58 V and 1.32 V or so (vs. SCE), both acidity and alkalinesolutionsfavoredthe reduction of nitrobenzene. The adsorption of compounds followed by the reduction process, which is controlled by the mass transfer step at higher nitrobenzene concentration. In addition, the higher anaerobic degree led to faster reduction rate.
[1]Agrawal A,Tratnyek P G.Reduction of n itro arom aticcompounds by zero-valent iron m etal[J].Environ.Sc i.Technol.,1996,30(1):153~160.
[2]Hung H M,L ing F H,Hoffm ann M R.K inetics andm echan ism of the enhanced reductive degradation of n i-trobenzene by elem ental iron in the presence of u ltra-sound[J].Environ.Sc i.Technol.,2000,34(9):1 758~1 763.
[3]QUAN X ie(全燮),YANG Feng-lin(杨凤林),XUEDa-m ing(薛大明),et al.Dechlorination of trichloro-ethylene in water by Pd/Fe0catalytic reduction[J].Journal of Dalian Un iv.of Technol.,1997,37(1):46~48.
[4]XU W en-ying(徐文英),ZHOU Rong-feng(周荣丰),GAO Ting-yao(高廷耀).Catalyzed iron inner electrol-ysis m ethod for treating refractory degradation organ icwastewater[J].Shanghai Environm ental Sc iences,2003,22(6):402~405.
[5]Keum Young-Soo,L i Q X.Reduction of N itroarom aticPestic ides w ith Zero-Valent Iron[J].Chemosphere,2004,54:255~263.
[6]YU L ing-chong(俞凌翀).Basic Theoretical O rgan icChem istry(2nded ition)[M].Be ijing:The Peop le’sEducation Press,1980,181~192.
[7]MA Chun-an(马淳安).Introduction of O rgan ic E lec-trochem ical Synthesis[M].Be ijing:Sc ience Press,2002,83~164.
