Study On Preparation Of Potassium Ferrate (Ⅵ) And Its Application In Wastewater With Phenol Treatment

Traditional water treatment agents cause quadratic contamination in the course of water treatment, therefore they can not satisfy people's requirement at the age when water quality's standards are required more and more higher. As a new, efficient, non-toxic and multipurpose water treatment agent that can exert oxidation, antisepsis, absorption, coagulation, aid-coagulation, sterilization, potassium ferrate(Ⅵ)can make up traditional water treatment agents' shortage. Preparation of potassium ferrate(Ⅵ) and its application in water treatment are studied in this paper. The results show that: (1)Traditional hypochlorous salt oxidation is faulty. By adding composite stable agent the author prepared and improving traditional technics, high purity's potassium ferrate can be prepared stably. Its optimization of preparative conditions: Fe(NO3)3·9H2O, excessive NaClO solution and composite stable agent react with saturate NaOH solution in the condition of 20℃, 1.5h; After salts are got rid of, saturate KOH solution is added in filtrate, potassium ferrate is separated out; Second crystal, organic compound washing and drying increase the purity of potassium ferrate. Its optimization of preparative steps: raw material's choice, preparing Na2FeO4 solution, getting rid of salts, preparing K2FeO4, treatment. Composite stable agent the author prepared is very important to prepare high purity's potassium ferrate.(2)The qualitative analysis of potassium ferrate: product's colors, appearance, physical and chemical characters, IR spectrum, X-radial diffraction. (3)The data about the quantitative analysis of potassium ferrate are few. This paper put forward three ways: Oxidation-reduction titration, ferruginous spectrophotometry, and direct spectrophotometry. Every way is applied in PH fit for itself. Every way should pay attention to some ways.(4)As an oxidation, potassium ferrate can remove phenol in wastewater efficiently. Extractive spectrophotometry is applied to analyze removing phenol's efficiency and the factor which impact the efficiency. Potassium ferrate can remove phenol efficiently. When n K2FeO4/n phenol =15, the rate of removing phenol is 97%. The factors, which influence removal effect, are the quantity of potassium ferrate, PH, mixing round continuously, reactive temperature, and reactive time. The quantity of potassium ferrate is the most important factor. PH is alsoimportant to remove phenol. The removing efficiency is best at PH=9～10.(5)The reaction that potassium ferrate oxidize phenol is 1.77 grade. The equation is V=0.1599F0.529P1.24.In a word, high pure potassium ferrate can be prepared stably and applied in water treatment efficiently.