苯醌对聚合硅酸铁多相UV-Fenton体系的增效机制  

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

作　　者：姜自立 李献众 刘治庆 刘力章 陈建新 JIANG Zi-li;LI Xian-zhong;LIU Zhi-qing;LIU Li-zhang;CHEN Jian-xin(School of Resources,Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China;Key Laboratory of Poyang Lake Environment and Resource Utilization of Ministry of Education,Nanchang 330031,China;Jiangxi Academy of Environmental Sciences,Nanchang 330077,China)

机构地区：[1]南昌大学资源环境与化工学院,江西南昌330031 [2]鄱阳湖环境与资源利用教育部重点实验室,江西南昌330031 [3]江西省环境科学研究院,江西南昌330077

出　　处：《中国环境科学》2020年第7期2943-2951,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(21966021,21367021);广东省科技计划资助项目(2017B030314175);江西省教育厅基金资助项目(GJJ13072)。

摘　　要：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、Fe^2+与Fe^3+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Fe^2+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Fe^2+可以通过Fenton反应转化成Fe^3+,反应结束后聚合硅酸铁能重新吸附Fe^3+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 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 Fe^2+and Fe^3+,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 BQconcentration,the degree of Fe^2+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 Fe^2+released from PSF would convert into Fe^3+through Fenton reaction in BQ enhanced heterogeneous UV-Fenton system.After treatment,the concentration of Fe^3+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.

关 键 词：多相UV-Fenton体系 橙Ⅱ 聚合硅酸铁 苯醌 羟基自由基 

分 类 号：X503[环境科学与工程—环境工程]