S(-Ⅱ)化合物的氧化动力学与pH的关系研究

Study on Relation Between Oxidation Dynamics of S(-Ⅱ) Componds and pH

S(- )化合物的氧化动力学与 p H之间存在密切关系 ,S(- )转变 S(0 )为吸收质子反应 ,S(0 )氧化为 S( )为放出质子过程 ,其中 S( )氧化为 S( )为质子自催化反应 .在以前实验研究的基础上 ,进一步再选择 4个反应体系 :Cl O2 -- Na2 S,Cl O2 -- SCN-,IO4-- TU和 Br O3--Na2 S2 O3,通过 Powerlab同时测定 p H和 Pt电极电位的变化 ,在釜式反应器中表现为 p H准振荡现象 .在实验研究的基础上提出硫价态变化模型 ,模拟出 p H准振荡现象和硫不同价态化合物的稳定性与 p H的关系 。

In the oxidation of S( Ⅱ) compounds by different oxidants (ClO2-, BrO3-, IO4-, H2O2 et al.), the reaction from S( Ⅱ) to S(0), absorbs proton and the reaction from S(0) to S(Ⅳ), releases proton respectively. Especially, The oxidation of S(Ⅳ)(HSO3-) showed proton auto catalysis; on the basis of previous experiments, four reaction systems were chosen: ClO2- Na2S, ClO2- SCN-, IO4- TU and BrO3- Na2S2O3 . The time series of pH and Pt potential in those systems were detected simultaneously. pH oligo oscillations were observed in a batch. The designed model can simulate the pH oligo oscillation. By further computation, the relation between stability of different sulfur species and pH was obtained and agrees with previous experiments.