Recently there has been increasing concerns on widespread occurrence of endocrinedisrupting chemicals (EDCs) in drinking water. Removing EDCs effectively based on theoriginal water treatment process has become a pressing problem. Potassium ferrate (K2FeO4), ahigh-effective agent in water treatment, has no secondary pollution and multifunction ofoxidization, adsorption, and flocculation coagulation-promotion, which provides a new methodfor the removal of EDCs. The paper presented the preparation, stability and the preservationconditions of K2FeO4, and its degradation of phthalic acid esters (PAEs) and2-sec-butyl-4,6-dinitrophenol (DNBP) under different experimental conditions.The results showed that for the hypochlorite oxidation synthesized K2FeO4, then higherpurity K2FeO4could be obtained and the conversion rate of Fe(III) to Fe(VI) was45.0%whenthe iron source was Fe(NO3)3·9H2O, iron dosing quantity was50%lower than theoretical value,the temperature range was20-30℃and the alkalinity range was10-12mol/L.The stability of K2FeO4was excellent at the pH of10and the temperature of25℃; Theaddition of O3,KI, KClO3and KCl reduced the stability of K2FeO4; While the addition ofNaSiO3and NaClO3improved the stability of K2FeO4; With the preservation conditions forNaClO3of15mmol/L, Na2SiO3of10mmol/L and alkalinity of9mol/L, the decomposition rate ofK2FeO4was16.7%at24th hour.The temperature for degradation of PAEs and DNBP with K2FeO4should be controlledrange of20-30℃and25-35℃respectively; when the pH range of4-7, the degradation of PAEsand DNBP was rapid; The addition of NH4Cl, Na2NO3and NaCl had no influence on thedegradation of PAEs and DNBP; Under the strong acidic condition, the degradation rate of PAEsand DNBP could enhance with the increase of MnCl2concentration.With the temperature at25℃, the pH range of2-10and the concentration of K2FeO4farabove PAEs and DNBP, the degradation of PEAs and DNBP conformed to the first-orderkinetics. And the degradation rate constants, with the change of pH, conformed to Gauss model. |