栲胶脱硫过程中单质硫生成机理

采用循环伏安法研究了栲胶脱硫过程中HS-和V5+之间的氧化还原反应。实验结果表明:在栲胶脱硫过程中,HS-和V5+之间的反应有多硫离子Sx2-生成,多硫离子是反应过程中的活性中间产物,其进一步转化可生成单质硫S8。随着反应物V5+浓度的增加,单质硫的生成速率增加。最后,提出了一种硫氢根HS-和V5+反应生成单质硫S8的自由基机理。 The redox reaction between HS-and V5+ in the process of tannin extract desulfurization was investigated by cyclic voltammetry(CV).The results show that HS-is first oxidized to produce polysulfides(Sx2-) which is reactive intermediate product and will further transform to form elemental sulfur S8,and the production rate of elemental sulfur S8 increases along with increasing the concentration of V5+.Additionally,a free radical reaction mechanism which describes the formation of elemental sulfur S8 from the redox reaction was proposed