Promotion effect of KOH on preparation of dissolved Fe(Ⅵ)
ZHANG Yan-ping1,2, XU Guo-ren1, LI Gui-bai1
1.School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;2.College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China
Abstract:
In order to improve the yield and stability of ferrate in solution, dissolved Fe(Ⅵ) prepared with NaOH and KOH respectively was compared in this study. The results showed that KOH is more suitable than NaOH for the preparation of dissolved Fe(Ⅵ) at temperature over 50 ℃. It is found that the dissolved Fe(Ⅵ) prepared with KOH increases quickly at first, and then slowly with the increasing concentrations of OH-and ClO-, while it increases rapidly at first and then decreases rapidly with the increasing dosage of Fe(NO3)3·9H2O. These results are different from that prepared with NaOH. It can be explained that solid K2FeO4 salts can be formed in KOH solution, and it will lower the Fe(Ⅵ) concentration, counteract the decomposition of Fe(Ⅵ), and improve the yield of Fe(Ⅵ). The maximum ferrate concentration is 0.163 mol/L obtained by 100 g/L Fe(NO3)3·9H2O and 6.16 mol/L KOH at 65 ℃. The stability of Fe(VI) is greatly improved due to the hypochlorite existed in the dissolved ferrate, and only 24% Fe(Ⅵ) has been decomposed after 16 d for 1 mmol/L Fe(Ⅵ) at 25 ℃.
Key words: dissolved Fe (Ⅵ) potassium ferrate (Ⅵ) stability oxidant
DOI：10.11916/j.issn.1005-9113.2010.01.006
Clc Number:X703.5
Fund:
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Promotion effect of KOH on preparation of dissolved Fe(Ⅵ)
本站小编 哈尔滨工业大学/2019-10-23
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