Study On Activation Technology Of Potassium Monopersulfate Compound Salt

With the improvement of people's awareness of environmental protection,people pay more and more attention to the improvement of the environment,especially the treatment of dye wastewater.Dye wastewater is a typical hard-degraded organic wastewater,and the total amount of azo dye wastewater accounts for more than half of the total amount of dyeing wastewater.Azo dye wastewater has the characteristics of high COD,high chroma,poor biochemical and difficult to deal with.Potassium monopersulfate compound salt?PMS?after activation,the release of a large number of sulfate radicals,hydroxyl radical oxidation of organic pollutants can be oxidized,decomposed into water,carbon dioxide and simple organic compounds.Therefore,it is necessary to study the method to activate PMS effectively.The catalytic activity of transition metal catalyst was studied by using the transition metal activation PMS and the degradation of methylene blue?MB?.Using transition metal ions(Fe²⁺,Cu²⁺),transition metal oxides?Fe₂O₃,CuO,CuFe₂O₄?,supported transition metal oxide?GO-CuFe₂O₄?catalyzed PMS to degrade MB dye wastewater.The main conclusions are as follows.1)Degradation of MB dye wastewater by PMS oxidation by transition metal ions(Fe²⁺,Cu²⁺).In the Fe²⁺ /PMS system,it can be divided into fast reaction stage and slow reaction stage,but,in the Cu²⁺/PMS system,the apparent reaction rate has a good linear relationship with MB.The Fe²⁺/PMS system is suitable for the oxidative degradation of MB in the medium acidic condition,while the Cu²⁺/PMS system is suitable for the oxidative degradation of MB in alkaline conditions.In addition,through free radical inhibition experiments showed that the main active free radicals is SO4-· in Fe²⁺/PMS and Cu²⁺/PMS system.2)CuO,Fe₂O₃ and CuFe₂O₄ catalysts were prepared by citrate combustion method.The catalysts were characterized by X ray diffraction and infrared spectrum.The results showed that the main components of the over metal oxide nanomaterials were CuO,Fe₂O₃ and magnetic CuFe₂O₄.The oxidation ability of CuO/PMS,Fe₂O₃/PMS and CuFe₂O₄/PMS was studied by single factor experiments.The results showed that the catalytic activity of CuFe₂O₄ was the highest.Through free radical inhibition experiments showed that the main active free radical is HO·,HO·,and SO4-· in CuO/PMS,Fe₂O₃/PMS,CuFe₂O₄/PMS system respectively.In addition,the results show that CuFe₂O₄ catalyst has good reusability.3)Graphite oxide was prepared by Hummers method,and supported transition metal oxide catalyst was prepared by GO loading CuFe₂O₄.The results of XRD and FT-IR show that the main components of the supported metal oxide magnetic nanomaterials are GO and CuFe₂O₄.The oxidation ability of GO-CuFe₂O₄/PMS system was studied by single factor experiments.In addition,compared with the CuFe₂O₄/PMS system,the main active is also SO4-· free in radical GO-CuFe₂O₄/PMS system.The catalytic activity of GO-CuFe₂O₄ is better than CuFe₂O₄,and reusability of GO-CuFe₂O₄ catalyst is better.