The Preparation And Catalytic Properties Of The Iron-based Compound Heterogeneous Fenton-like Catalyst

The treatment of dye water pollution of environment is realizing the aim of sustainable development and the biggest obstacle to the important strategy problem to be solved in our country. Catalytic oxidation technology especially the heterogeneous Fenton-like technology plays important roles in the degradation of the environment organic contaminants because it is environmentally friendly, capable of performing room temperature and atmospheric pressure, capable of treating with high concentration and biorecalcitrant of organic contaminants, being easy to be recovered and a negligible amount of metal ions into the liquid phase. Therefore, to develop novel heterogeneous Fenton-like catalyst with higher efficiency and stability has become challenging topics in the Fenton reaction field and has attracted great attention of many scientists.This paper intend to develop novel heterogeneous Fenton-like catalyst with higher efficiency and stability, to treat with high concentration and biorecalcitrant of organic contaminants, the iron-based compounds were studied on preparation and catalytic performance to treat with high concentration and biorecalcitrant of organic contaminants. The main contents obtained from the present research are follows:This paper designed and synthesised the pure phase of iron (Fe, Co, Ni) sulfide、 FeS2、CoS2、NiS2and FeS2crystals doped with Co and Ni. The effects of reaction conditions on the crystal formation, structure and morphology were studied.Meanwhile reactive red X-3B was taken as the probe molecular to evaluate the catalytic activity of the catalyst. The effects of concentration of H2O2, initial pH, the quantity of catalyst, and the initial concentration of X-3B on the degradation rate of the X-3B solution were investigated. The results showed that the iron (Fe, Co, Ni) sulfide were efficient Fenton-like catalysts. They can effectively decompose the high concentration organic pollutants X-3B with H2O2. The catalytic activity did not exhibit significant loss after10runs, showing the good stability that can be used repeatedly and easy separation of the catalyst from the treated wastewater.Catalyst PFA has been successfully prepared using fly ash as the raw materials by Magnetic separation and wet grinding. The sample was characterized by XFS, XRD, and SEM. Meanwhile reactive red X-3B was taken as the probe molecular to evaluate the catalytic activity of the PFA catalyst. The effects of concentration of H2O2, initial pH, the quantity of catalyst, and the initial concentration of X-3B on the degradation rate of the X-3B solution were investigated. The results showed that the PFA was efficient Fenton-like catalyst. It can effectively decompose the high concentration organic pollutants X-3B and the degradation ratio of organic pollutants in the concentration of150.0mg/L reached over95%in25min when the catalyst1.0g/L, pH=3.0. The catalytic activity did not exhibit significant loss after10runs, showing the good stability that can be used repeatedly and easy separation of the catalyst from the treated wastewater.