The Preparation Of Nano Graphite And The Study Of Electrochemical Degradation Of Organic Pollutants

Nanographite can be produced largely for the simple preparation process, whichcan be used as electricconduction additives in the polymer composite conductivematerials for the good electroconductibility. The technological parameter ofnanographite preparation was optimized in this paper, on the basis of that, thenanographite complex electrode was prepared. The electrosynthesis of hydrogenperoxide and the degradation of Phenol by nanographite complex electrode were studied,which provided the important theory basis for environmental pollutant cleansing field ofnanographite.Nanographite flake(Nano-G) through ultrasound dispersing sulfurfree expandedgraphite(EG) which got by chemical oxidation and microwave puffing method havebeen prepared by different size natural flake graphite(NG). The influence for Nano-Gmicrostructures was studied, NG particle size, expanded time, ultrasound time and EGscattered volume concentration were analyzed by means of SEM, XRD and Raman. Theresults showed that the EG kept better lamellar structure of graphite when the expandedtime was20s; The thickness of Nano-G was10～40nm, and Nano-G crystallitedimension was the smallest when the raw material was NG200, the proportion of EGand ethanol was1:1000, the ultrasound time was12h.The Nano-G and paraffin wax were prepared as Nano-G/paraffin wax electrode,which was used for the electroconductibility study. The CV and Tafel curve showed thatnanographite was favor for the conductivity, and Nano-G200was the optimal one, inwhich the two-electron reduction reaction was generated.Nano-G/PTFE electrode was prepared, and the feasibility of electrosynthesis H2O2by Nano-G/FTFE electrode was discussed. The results indicated that theelectrosynthesis H2O2was influenced by dissolved oxygen content, initial H+concentration, electrolyte concentration and temperature. Improving oxygenconcentration was beneficial to the formation and cumulation of hydrogen peroxide,H2O2cumulant and current efficiency reached the maximum value when the electrolysistime was20min. The electrolysis phenol was conducted by the diaphragm cell Nano-G/PTFEcathode and the Ti/RuO2anode. The results showed that the degradation was influencedby aeration conditions, current density, initial pH and electrolyte concentration. Incathode compartment the degradation rate of phenol reached89.5%,the CODdegradation was81.3%under120min’s electrolysis when the current density was39mA/cm2, the initial pH value was7.0, the electrolyte concentration was0.1mol/L, thephenol initial concentration was100mg/L.