苯醌对聚合硅酸铁多相UV-Fenton体系的增效机制

通过构建苯醌增效聚合硅酸铁多相UV-Fenton体系，讨论了体系中橙Ⅱ的脱色和降解途径.在研究苯醌浓度对聚合硅酸铁铁离子的释放、Fe²⁺与Fe³⁺之间的转化、H₂O₂分解和·OH生成影响的基础上，提出了苯醌对聚合硅酸铁多相UV-Fenton体系的增效机制.结果表明，随苯醌浓度的增加，其紫外光下光解还原聚合硅酸铁并释放Fe²⁺的程度增大、H₂O₂分解速度加快、产生·OH浓度峰值增高且出现的时间提前；苯醌增效体系释放于溶液中的Fe²⁺可以通过Fenton反应转化成Fe³⁺，反应结束后聚合硅酸铁能重新吸附Fe³⁺并使其浓度降低，避免了增效体系铁离子的二次污染.本研究将为多相催化剂催化过程的调控提供新的视角，为多相光助-芬顿反应在有机废水资源化中的应用提供理论依据和技术支持.

The enhanced mechanism of benzoquinone(BQ) on poly-silicate-ferric(PSF) in heterogeneous UV-Fenton system

The decoloration and degradation pathway of Orange II were discussed in BQ enhanced heterogeneous UV-Fenton system with PSF as catalyst. Based on the study of BQ concentration's effects on the release of iron ions from PSF, the changes between Fe²⁺ and Fe³⁺, the decomposition of hydrogen peroxide and the generation of·OH, an enhanced mechanism of benzoquinone (BQ) on Poly-Silicate-Ferric (PSF) in heterogeneous UV-Fenton system was proposed. The results showed that with the increase of BQ concentration, the degree of Fe²⁺ released from PSF by photolysis reduction under UV light increased, the decomposition of hydrogen peroxide accelerated, and the peak of hydroxyl radical concentration increased and appeared earlier. The Fe²⁺ released from PSF would convert into Fe³⁺ through Fenton reaction in BQ enhanced heterogeneous UV-Fenton system. After treatment, the concentration of Fe³⁺ could be significantly decreased by adsorption on PSF, avoiding secondary pollution of iron ions. This study will provide a new perspective for the regulation of heterogeneous catalysts, and provide theoretical basis and technical support for the application of heterogeneous UV-Fenton reaction in the recycling of organic wastewater.