Kinetics of Fe^IIIEDTA complex reduction with iron powder under aerobic conditions

Abstract

The kinetic model of FeIIIEDTA complex reduction with iron powder under aerobic condition is deduced and validated. It was .

The regeneration of Fe-EDTA denitration solutions by nanoscale zero-valent iron

“…Only strong reductants like dithionite ion and hydrazine, or active metals such as aluminum and zinc powder, could be considered as suitable candidates to reduce Fe(III)EDTA effectively. 3,14,15 According to references, 3,16 the redox equation of Fe(III)EDTA with iron powder or NZVI can be written stoichiometrically as:…”

“…27 But the increase of pH is unfavorable for the reduction of Fe(III)EDTA. 16 Therefore, the change of the solution from weakly acidic (pH 5.0) to neutral (pH 6.8) seems to have little effect on regeneration-absorption combination process, since the dual effects of acidity on regeneration and absorption offset each other.…”

“…Chemicals with reducibility, such as polyphenols, dithionite, hydrazine, metal powder, etc., are screened and adopted directly in the absorption/regeneration process. 3,4,[12][13][14][15][16][17] Feiqiang et al investigated the mechanism and kinetics of Fe(II)EDTA-NO and Fe(III) EDTA reduction by iron powder. 15,16 Adam et al found that zinc powder can effectively reduce Fe(III)EDTA aqueous solution at 20 C, with a noticeably higher reduction rate compared to aluminum and tin powder.…”

“…3,4,[12][13][14][15][16][17] Feiqiang et al investigated the mechanism and kinetics of Fe(II)EDTA-NO and Fe(III) EDTA reduction by iron powder. 15,16 Adam et al found that zinc powder can effectively reduce Fe(III)EDTA aqueous solution at 20 C, with a noticeably higher reduction rate compared to aluminum and tin powder. In addition, the reduction capability of nanoscale zinc powder was about 11 times higher than that of normal-sized zinc.…”

Simultaneous Biological and Chemical Removal of Sulfate and Fe(II)EDTA-NO in Anaerobic Conditions and Regulation of Sulfate Reduction Products

“…This demonstrates that the removal load of Fe(II)EDTA-NO reached a high level in our experiment. In the process of NO absorption, Fe(II)EDTA is often oxidized to Fe(III)EDTA by oxygen in flue gas [30]. Therefore, it is necessary to consider how to reduce Fe(III)EDTA to Fe(II)EDTA to ensure the absorption capacity of the solution.…”