摘要
采用分光光度法研究了在25～40℃的酸性介质中2，2’-联吡啶（bpy）催化Cr（Ⅵ）氧化1，2-丁二醇（1，2-butanediol）的反应动力学及其机理．结果表明：反应对Cr（Ⅵ）是准-级，对1，2-丁二醇是分数级．在保持准-级反应条件（[1，2-butanediol]0〉〉[Cr（Ⅵ）]0）下，该反应的表观速率常数kobs随着[H＋]的增加而增大，随着[bpy]的增加而增大，并且无盐效应．据此实验现象，笔者提出了该反应的反应机理，并且由假设的反应机理推出的速率方程能很好地解释全部实验现象，为减少Cr（Ⅵ）对环境污染提供了理论依据．
The kinetics and mechanism of 2,2＇-bipyridyl catalysis of the Cr （ Ⅵ ） oxidation of 1,2-butanediol in aqueous acidic medium were studied by spectrophotometrically in the temperature range of 25- 40 ℃. The reaction showed pseudo-first order with respect to Cr （ Ⅵ） and fractional order to 1,2-butanediol. Under the conditions of pseudo-first order （ [ 1,2-butanediol]0〉〉 [ Cr（ Ⅵ ） 10）, the observed rate constant （kobs） increased with the increase in [H＋ ] and [bpy]. There is no salt effect. Based on the experimental results, a probable reaction mechanism of oxidation was proposed. The rate equation derived from the mechanism could explain all the experimental phenomena, and theory of reducing the pollution of Cr （ Ⅵ ） was advanced.
出处
《河北大学学报（自然科学版）》
CAS
北大核心
2008年第5期499-506,共8页
Journal of Hebei University(Natural Science Edition)
