Study On The Phenolic Pollutants Treatment By The Ferrate

Sodium ferrate was prepared by electrolysis of ferreous as anode,brass wire as cathode, sodium hydroxide as solutions and ceramics diaphragm as diaphragm. The decrease of anode cell volume, the increase of divided cell in appropriate scope, the increase of electrolyte concentration, the decrease of diaphragm aperture and proper temperature will all improve sodium ferrate concentration.The produced potassium ferrate can degrade analog wastewater containing phenol p-chlorophenol(p-CP), bisphenol A (BPA). Factors of the amount of ferrate, initially pH Value, organic contamination and treat time were discussed, The optimal conditionswere as follows: The solution of 50.47 mg/L 4-CP(pH=9) was oxidated at 35.3mg/L K₂FeO₄ for 50 min and CODCr degration efficiency can reach 90.3% by orthogonality experiment. The solution of 50 mg/L phenol(pH=9) was oxidated at 20:1 ferrate:phenol molar ratio for 30 min and concentration degration efficiency can reach 83.6%. The result showed that increase ferrate amounts and time and decrease the initial concentration of organic contamination can promote the oxidation reaction. PH is also important to remove phenol. Besides, the ferrate oxidation of chlorophenols including 4-chlorophenol (CP) 2, 4-dichlorophenol 2-chlorophenol and the isomeric compound of cresol in aqueous solution was investigated.It showed that the quantity of substituting group and ites sites had an importent influence on the result of the oxidation.The final products by GC-MS were analyzed, the possible oxidation mechanism were discussed. The study of the absorption of Fe³⁺ showed that the combined effect of oxidation by ferrate and adsorption by hydrolysed iron from ferrate decomposition was believed to be the primary reason for effective organic pollutants removal from surface water by ferrate.