Plus Anions And Temperature On The Fe (iii) And Clo ~ - Chemical Reactions In Solution

Due to its strong oxidizing power, ferrate(VI) has broad potential applications inwater and wastewater treatment, environmentally friendly selective catalytic oxidantand "green" high energy battery. However, the instability of ferrate(VI) which is unlikethe stable chlorine stopped its applications on a large scale. In order to using theferrate(VI) widely in reality, the fundamental studies about the ferrate(VI) is veryimportant. In the last long time, it was believed that the ferrate(VI) in alkaline solutionwas decomposed into oxygen and ferric hydroxide. However, it has been proved to beimperfect recently. In this article, the impactions of some inorganic salts on the stabilityof ferrate(VI) were studied. Then, besides of the reaction course of ferric salts andsodium hypochlorite, the reaction course of Fe(VI) to Fe(IV) in hot and high alkalinesolution were traced by visible spectrometry method. A new reaction was found in thereaction course of ferric salts and sodium hypochlorite in hot and high alkaline solution.These results enriched the ferrate researches, developed the classic wet oxidationmethod, and provided the basis for preparing ferrate (IV) with the sodium hypochloriteoxidation of ferric salts.Firstly, in order to find the substance which could enhanced the stability of ferrate(VI) solution, some inorganic salts such as Na₂SiO₃, Na₃PO₄, Ti(SO₄)₂, Na₂SiF₆ were added into the reaction system for producing ferrate(VI). Then, the reaction curse was traced and the stability of the product ferrate(VI) solution was traced. The results showed adding Na₃PO₄ made the reaction of producing ferrate(VI) more rapidly. However, it was little benefit for enhancing the stability of the product ferrate(VI) solution. Adding Na₂SiO₃, Ti(SO₄)₂, or Na₂SiF₆ were benefit for enhancing the stability of the product ferrate(VI) solution long time or short time respectively. But, adding these three salts had no influence on the reaction course of producing ferrate(VI).Secondly, at different reaction temperature, the reaction course of ferric salts and sodium hypochlorite in high alkaline solution was traced by visible spectrometry. The green ferrate(IV) solution were gained finally at the temperature scope of 45°C～95°C. At each temperature ferrate(VI) was produced by the oxidation of ferric salts with sodium hypochlorite firstly. Then besides ferric hydroxide, ferrate (IV) was a resulting product of ferrate (VI) decomposition. The two decomposing reactions of ferrate(VI) coexisted in the reaction system. Temperature caused important influence on the reactions. Ferrate(VI) produced and decomposed more rapidly in high temperature. And ferrate (IV) was unstable above 85°C.Finally, in order to prove the green ferrate(IV) solution was the decomposition product of ferrate(VI), but not the oxidation product by the oxidation of ferric salts with sodium hypochlorite, the reaction course of Fe(VI) to Fe(IV) at different temperature was traced by visible spectrometry. The green ferrate(IV) solution were gained finally at the temperature scope of 65°C～95°C. At each temperature, the curse of Fe(VI) to Fe(IV) was very clearly. Compare with the study on the reaction course of Fe(VI) to Fe(IV) at room temperature, it could be found the temperature caused important influence on the decompose reaction of Fe(VI) solution. More higher the temperature, more rapidly the decomposition of Fe(VI). Also, the results proved the green ferrate(IV) solution was the decomposition product of ferrate(VI) in the reaction ferric salts and sodium hypochlorite in high alkaline solution.