Study on Electrochemical Electrode Behavior of Nitrobenzene Compouds
|Keywords||Nitrobenzene Cyclic voltammetry Carbon paste electrode Electrode reaction The apparent activation energy The peak current|
This article titanium-bearing slag, high titanium slag as a semiconductor catalytic materials and graphite and titanium concentrates prepared carbon paste electrode by cyclic voltammetry, differential pulse method, quasi-steady-state polarization curves and constant potential step method carbon paste electrode electrochemical reaction of nitrobenzene. This article first investigated by cyclic voltammetry catalyst content, particle size and calcination temperature on the catalytic activity. Experiments show that: 0.5mol / L sulfuric acid system, the catalytic activity of the catalyst containing about 1%; smaller the catalyst particle size, the higher the catalytic activity; Order of the slag, Panzhihua Iron and Steel slag, high titanium slag is not calcined the highest catalytic activity in the highest catalytic activity of titanium concentrate calcined between 400 ~ 600 ℃ temperature; optimal catalytic activity, the catalytic activity of the law of the four raw materials: high titanium slag gt; titanium concentrates gt; Pangang slag gt; Order of the slag. Reaction of nitrobenzene in carbon paste electrode by cyclic voltammetry and HPLC results showed that: nitrobenzene occurred on the electrode direct electrode reaction is irreversible, is reduced to aniline; magnetic field and The synergistic effect of ultrasound can accelerate the rate of the reduction reaction of nitrobenzene on the electrode; changing the pH of the solution may change nitrobenzene reduction mechanism; nitrobenzene electrode reaction is controlled by diffusion step controls elevated reaction: Moderate the temperature can increase the rate of the electrode reaction; 254nm under UV irradiation can enhance the rate of the electrode reaction of nitrobenzene. By the quasi-steady-state polarization curve method to get the carbon paste electrode in acidic medium power reduction of nitrobenzene apparent activation energy of 14.11kJ/mol, and analyzed by Chronoamperometry: the electrode in acidic medium power The apparent activation energy to restore the nitrobenzene electronic pros and cons steps 11.354kJ/mol. Research and found that the redox reaction of these intermediates are limited in the reaction of the functional group of the benzene ring Shangguan, a benzene ring is more difficult to be oxidized directly by the behavior of the electrode of the intermediate product may be formed in the process of degradation of nitrobenzene; nitro group on the benzene ring Restore the potential between -0.4 ~-0.5V. Aniline and nitrobenzene reduction peak quantitative peak of its quantitative analysis by differential pulse, 0.5mol / L sulfuric acid solution of the base solution, electrode settling time 150s, scan rate of 100mV / s, nitro benzene concentration between 5 ~ 160mg / L showed a good linear relationship with the reduction peak current of 5 ~ 100mg / L; aniline concentration showed a good linear relationship between the reduction peak current. -0.4V 0.5mol / L sulfuric acid and 100 mg / L nitrobenzene mixed solution constant pressure electrolysis 120 minutes, the nitrobenzene degradation rate of up to 38.70%, aniline generation rate of 33.19%.