Syntheses Of Cerium Benzen Tricarboxylic Acid Complexes And Adsorption Of Several Kinds Of Solution Anion

In recent years, the serious water pollution that caused by a large number of wastewater make available water resources dwindling and threaten people’s life and production. Phosphorus-containing wastewater make water quality deterioration and serious water eutrophication; Excessive emissions of fluoride wastewater make human body absorb excess fluoride and fluoride poisoning phenomenon gradually increase. Arsenic and its compounds are toxic substances. Arsenic wastewater can be toxic to humans and animals and do harm to human health.This paper adopts the solvothermal synthesis by changing the synthesis conditions such as the category of the met al salts (cerium nitrate, cerium chloride, cerium sulfate), different ligand (benzene tricarboxylic acid, terephthalic acid), the amount of solvent(N, N-dimethyl formamide DMF), the ratio between the reactants, reaction temperature, reaction time etc. to synthesis series complexes. And they are applied to simulated wastewater containing phosphorus(lmg/L). The results showed that the complexes that have the best processing effect are the conditions of n(Ce (NO3)3·6H2O):n (benzene tricarboxylic acid)=3:1, Ce (NO3)3·6H2O=6μmol, benzene tricarboxylic acid=2μmol, DMF=80mL, reaction temperature180℃for three days. The removal rate can be98%when the reaction time is1h and the amount is0.15g/L for the1mg/L initial phosphorus.The optimal complexes is used for the research of phosphorus removal. Through the research of initial concentration, reaction time, pH value, this paper explores the removal ability of the complexes about phosphorus wastewater and the results showed that the maximum phosphorus adsorption capacity is41.2mg/g and it can achieve adsorption equilibrium when the initial phosphorus concentration is12mg/L and the reaction time is30min. When the solution pH is neutral, the treatment effect is better. About the regeneration experiments of the complexes that have used, we use different concentrations of hydrochloric acid and sodium hydroxide to soak them, and the results showed that soaking with10%hydrochloric acid after3h, the complexes of the regenerative capacity can reach85%.The optimal complexes is used for the removal of fluoride. The results show that the maximum adsorption capacity of fluoride was101.8mg/g, and it can achieve adsorption equilibrium when the initial phosphorus concentration is35mg/L and the reaction time is3h. When the solution pH is alcaline, the treatment effect is better. Soaking with20%hydrochloric acid after3h, the complexes of regenerative capacity can reach90%.The optimal complexes is used for the removal of arsenic. The results show that the maximum adsorption of arsenic capacity is33.3mg/g, and it can achieve adsorption equilibrium when the initial phosphorus concentration is10mg/L and the reaction time is5h. When the solution pH is neutral, the treatment effect is better. Soaking with30%hydrochloric acid after6h, the complexes of regenerative capacity can reach83%.