Electrocatalytic Oxidation Of Heterostructure Phenols And Its Application In Oilfield

Phenolic compounds is widely used and stable chemical matter. Its accumulation in environment would cause severe environmental pollution. Treatment technologies available for phenolic wastewater are physical, chemical, biological, and electrochemical processes, or the combined process of technologies. In the past two decades, the electrochemical oxidation has been widely investigated for wastewater treatment. Its good applicability, high oxidation efficiency, no secondary contamination, fast reaction rate, and easy operation make it a very attractive alternative for degrading toxic and biologically refractory organic pollutants.In this thesis, the electrochemical oxidation process characterizations and correlative problem has been studied using titanium substrate Oxide anode for treatment of the refractory organic pollutants, such as phenol, o-aminophenol and o-nitrophenol. The experiments were performed in an electrochemical undivided cell reactor using Ti/IrO2-Ta2O5and Ti/IrO2-Ta2O5-SnO2anode. Preliminary experiments were conducted using sodium chloride and sodium sulfate as supporting electrolytes to study the effects on the removal of chemical oxygen demand (COD). Operating variables such as chloride concentration, initial phenols concentration, electrolysis time and current densities were studied using chloride as the supporting electrolyte for maximum degradation. The result showed that higher COD removal occurred only in the presence of chloride. At the end of240minutes at50mA/cm2current density and in the presence of3500mg/L chloride, there was75.52%removal of COD for phenol and at60mA/cm2current density and in the presence of1500mg/L chloride, there was90.43%removal of COD for o-aminophenol using a Ti/IrO2-Ta2O5anode. At the end of240minutes at40mA/cm2current density and in the presence of4500mg/L chloride, there was74.8%removal of COD for o-nitrphenol using a Ti/IrO2-Ta2O5-SnO2anode.The electrochemical oxidation in aqueous solution of phenol, o-aminophenol and o-nitrophenol were studied on titanium substrate Oxide anode. The effects of different electrodes on the electrochemical oxidation reactions and reaction intermediates of phenols were investigated using Uv-Vis spectroscopy. The electrogeneration of benzoquinones or Hydroquinone were detected by the method of high performance liquid chromatograph (HPLC). The results have shown that the oxidation and removal of phenols in aqueous solution are attributed to a further oxidation of hydroxylated products (hydroquinone and pyrocatechol). Therefore, it may be considered as the electrochemical oxidation route of phenols was same. Organic structure effects on the electrochemical degradation pathway.In the paper, the combined process of electrocatalytic oxidation and the fine filtration process of carborundum were studied. The experimental results indicated that the removal of COD depends on the wastewater source, electrolysis time, electrode materials, current density and chloride ion concentration. It was concluded that the electrocatalytic oxidation method could be used for the removal of COD in the wastewater.The study harvests have successfully applied in oil wastewater. It has been showed that the electrochemical oxidation process is promising for oil wastewater treatment and reuse.