Abstract
Potassium ferrate is a kind of noval oxidant for water purification; it can remove organic pollutants in water effectively. After reacting with pollutants, potassium ferrate will not produce any harmful substance, and it does not have toxic effects to aquatic biological breathing. Potassium ferrate is the integrative multi-functional green water treatment agent that is a kind of collection for oxidization, absorbability, coagulation, disinfection and deodorization. Potassium ferrate can be synthesized by wet oxidation method; its principle is that in strong base condition, ClO- can oxidize Fe3+ to Fe6+, and then add saturated KOH solution to precipitate solid potassium ferrate. The optimum conditions for the preparation of ferrate processes were observed with an initial Fe(NO3)3．9H2O concentration of 150mM, initial NaOCl concentration of 150mM and initial NaOH concentration of 2.5M. During the experiment, the influence of pH, dosage and the concentration of explosives on the ferrate oxidation process were examined for understanding of the explosives remoal by ferrate. The rate constants were determined by a Langmuir–Hinshelwood kinetic model incorporating the various species equilibriums for the explosive compounds. The results can be used for practical explosives wastewater process design and support the process information required. The degradation by-products were investigated using UPLC/MS/MS, in order to build a profile for the characterization of byproducts from the degradation of explosives. The characterization of explosives by the intermediates profile was demonstrated on a variety of explosives samples.