Fundamental Research On Electrochemical Catalytic Oxidation Of Sulfide Solution

Now with the development of modern chemical industry, environmental issue is becoming more and more serious. A large amount of odorous H2S gas and sulfide sewage is produced from the industrial procedures such as petrochemical industry, sewage treatment and waste disposal industry, and recently more and more attention has been paid on how to deal with the emission of hydrogen sulfide gas and sulfide sewage effectively.This thesis is dedicated to the use of electrochemical technology such as fuel cell and electrolysis method to dispose sulfide pollutant, and investigate the electrochemical performance of these new technologies in the practice.Fuel cell technology was used to complete the removal of aqueous sulfide and concomitant power generation. The fuel cell took granular activated carbon as catalyst material of anode and cathode. During the experimental period technological parameters was optimized and adjusted; the optimal pH of sulfide solution for battery discharge was 7.0, the optimal ohmic resistance loading was 100 ohm; Both higher and lower concentration could reduce the amount of electric power,0.0056 mol/L was the suitable value; Increases in the flow rate of sulfide solution could improve the performance of electricity output, however, increases in the flow rate had an adverse effect on the sulfide removal efficiencies, the optimal flow rate was 10 ml/min; The cell performed better with the activated carbon pretreated by NH4OH. The maximum power output was 720.56 W/m3 of total anodic compartment (TAC) under the above optimal continuous operation condition, while its corresponding sulfide removal rate was 3.56% for single cycle.Electrolysis method was used to achieve electrochemical oxidation of sulfide in the alkaline solution, here spherular CO3O4/C catalyst was synthesized and made into electrode to replace graphite electrode for its electro-oxidation catalytic behavior. The behaviour of electro-catalysis for sulfide ions in alkaline solution was investigated by electrochemical measurements such as potentiodynamic scan and potentiostatic polarization. The results showed that CoO4/C catalyst owned a much higher catalytic activity toward the oxidation of sulfide ion compared to graphite material. In addition its highest current density of 580 mA/cm2 was obtained at -0.4 V, and its catalytic performance kept stable during potentiostatic polarization, so it possessed certain...