The Study On The Treatment Of Wastewater Containing Nitrobenzene By An Electrochemical Oxidation

Electrochemical oxidation processes,as a technology that friendly to the environment, good capability to deal with pollutants,small size of equipments been concerned by researchers.In recent years,this technology has been successfully applied in the purification of wastewaters come from textile,oil refineries and leather industries.DSA as the most important component of the electrochemical oxidation processes has became an important research direction.By Sol-Gel method a new type of DSA(Ti/SnO₂,Sb₂O₃/SnO₂,Sb₂O₃, RuO₂,Co₃O₄)with the nanocrystal surface and with gradient constitution been produced.Then the SEM and XRD pictures show the feasibility to produce this type of DSA by the method.The experiment of degradation of nitrobenzene has been taken in the two-dimensional device.The datas of the single factor experiments and orthogonal experiment show that the electrodes has a a strong adaptability about the initial concentration of nitrobenzene and give the best operating conditions to deal with the wastewater contains nitrobenzene:each square centimeter of the DSA been used to treat 12 mL wastewater,the current density is 10 mA/cm2, the initial pH=2.Under the best operating conditions and the initial concentration of nitrobenzene is 240mg/L,when electrifying 140 min the degradation rate reach at 98.11 percent,the power consumption is 5.83 KW·h.It means that at a correspondingly lower energy consumption the DSA can give excellent performance.And through the test it is found that the service life of the DSA is long.With GC-MS results,a mechanism of nitrobenzene degradation was preliminarily discussed:the deoxidization of the cathode also played an important role in the nitrobenzene degradation.