%0 Journal Article
%T Mechanism and promotion effect of K+ on yield of Fe(VI)<br>K+对Fe(Ⅵ)生成的稳定促进作用和机理研究
%A Zhang Yan-Ping
%A Xu Guo-Ren
%A Li Gui-Bai
%A <br>Zhang YP
%A Xu GR
%A Li GB
%J 环境科学
%D 2008
%I 
%X The mechanism and promotion effects of K+ on the yield of Fe(VI) were studied during the reaction of forming ferrate. The experiment results showed that K+ is far better than Na+ for the preparation of Fe(VI) at temperatures higher than 50 degrees C. The optimal temperature for the preparation of Fe(VI) with K+ is 65 degrees C. During the reaction, the yield of ferrate increases with the concentration of K+, and the promotion effect of K+ is obviously with ferric nitrate dosage increase. The Fe(VI) concentration prepared with 4.4 mol/L KOH is 0.05 mol/L at 85 g/L ferric nitrate; and which achieves 0.15 mol/L when added 2 mol/L K+. The promotion effect of K+ on the yield of ferrate is remarkable when ferric nitrate dosage is higher than 75 g/L, reaction temperature is below 55 degrees C and ClO(-) concentration is lower than 1.16 mol/L. The K+ can substitute for partly alkalinity and reduce the concentration of OH(-) in the reaction solution. During the reaction, the K+ can enwrap around FeO4(2-) that can reduce the contact between Fe(3+) and FeO4(2-), and decrease the catalysis effect of Fe(3+) on FeO4(2-). At the same time, K+ can react with FeO4(2-) to form solid K4FeO4, whichwill lower the Fe(VI) concentration, decrease the decomposition rate of Fe(VI), enhance the stability and improve the yield of Fe(VI).
%K Fe(VI)
%K ferrate
%K potassium ion
%K oxidant<br>Fe(Ⅵ)
%K 高铁酸盐
%K K+
%K 氧化剂
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=81AEFE984AB54265FD40801E8E8B6E77&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=38B194292C032A66&sid=2E4E3741E8FB64E9&eid=6D25DD85174CF6DB&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=25