Preparation Of Co-TiO₂ Nanotube Electrode And Its Catalytic Degradation Of Polyacrylamide

In this paper,the characteristics and treatment technology of the flowback fracturing shale gas water?FFSGW?were analyzed,and the electrochemical catalytic oxidation was put forward to deal with the FFSGW.This paper focuses on the removal of the main chemical oxygen demand?COD?donor-polyacrylamide?PAM?in FFSGW,in order to prepare a kind of nanometer electrode material which was stable?chlorine-resistant?,high efficiency?high oxygen oxidation potential,high current efficiency,low energy consumption?as the research target.The preparation process of electrodes was investigated,and the optimum preparation conditions of Co-TiO₂ nanotubes plates were studied by characterizing the surface morphology,crystal structure,electrochemical characteristics and catalytic degradation of organic.The influence conditions of Co-TiO₂ nanotubes plates in treating PAM simulated wastewater were investigated.,the mechanism of electrocatalytic oxidation of Co-TiO₂ nanotubes plates materials was analyzed,and the results of treatment of the actual FFSGW were evaluated.Cobalt?Co?was used to modify the TiO₂ nanotubes?TNTU?and a small amount of cobalt?0.0333 mg/cm2?was doped into the TNTU by using bipolar pulsed current,which significantly improved the conductivity of the TNTU and the effect on the activity of chlorine.Cobalt could also significantly reduce the TNTU electrode's chlorine evolution potential and continue to maintain a high oxygen evolution potential at doped amount.The optimal current density is 5mA/cm2 for Co-TiO₂ NTU electrode in the electrolysis treatment of PAM simulated waste water.The optimal concentration of chlorine ion?Cl-?is 20000mg/L.COD removal efficiency and current efficiency under acidic conditions both are slightly better than alkaline conditions.The alkaline electrolysis conditions could also slow down the chemical corrosion of Co-TiO₂ NTU,which is beneficial to the long-term use of Co-TiO₂ NTU.The degradation process of high polymer PAM was studied and analyzed.PAM was transformed from polymer to small molecule during the electrolysis process,and small molecule compounds including chlorohydrin and chloroether were produced.The Co-TiO₂ nanotubes electrode is used in the electrolytic treatment of the actual FFSGW in two-dimensional electrolysis system.The anode was a Co-TiO₂ electrode and the cathode was a graphite electrode.Actual FFSGW was electrolyzed.at the current density of 7 mA/cm2 for 60min.The removal of COD rate was 54.5%.The current efficiency was 51.8%and the power consumption was 27.8kWh/kgCOD.The removal of COD rate reached to 90.9%for 120min electrolysis.