污水中溶解性有机物与非均相催化剂协同诱导O3产生羟基自由基的链反应机制研究

臭氧氧化和催化臭氧氧化工艺深度处理污水过程中，臭氧分子（O3）分解产生羟基自由基（•OH）的效率对于难降解有机污染物的有效控制起到关键作用，然而目前污水中溶解性有机物（DOM）与非均相催化剂诱导•OH产生的链反应机制尚不清楚。本项目将通过系统考察不同组分/结构的DOM诱导链引发反应的•OH产率及对链增长反应的促进能力，建立其与DOM化学结构特性的构效关系，揭示DOM诱导O3产生•OH的链反应机制；综合评价非均相催化剂诱导•OH产速/产率和对链增长反应的诱发能力，并建立其与非均相催化剂表面特性的构效关系，揭示非均相催化剂诱导O3产生•OH的链反应机制；最后通过考察非均相催化剂与DOM共存时非均相催化剂对•OH产生的促进作用，全面揭示非均相催化剂与DOM协同诱导•OH产生的链反应机制。本项目研究成果将为臭氧氧化及催化臭氧氧化工艺深度处理污水的优化应用提供理论依据与支持。

During ozonation and catalytic ozonation of wastewater, the efficiency of ozone (O3) decomposition into hydroxyl radicals (•OH) plays a key role in the effective control of refractory organic pollutants. However, the mechanism of •OH formation via the chain reactions induced by dissolved organic matters (DOM) in wastewater and heterogeneous catalysts is still unclear. In this project, DOM with different components/structures will be selected to quantify their •OH yields in the initiation reactions and abilities to promote the propagation reaction. Then the structure-activities relationship between the obtained yields and abilities with the chemical structure characteristics of DOM will be established to reveal the mechanism of •OH formation via chain reaction induced by DOM. It will comprehensively evaluate the rate and yield of •OH formation induced by heterogeneous catalysts and the ability of inducing propagation reaction. Then, the structure-activities relationship between them with the surface characteristics of heterogeneous catalysts will be established to reveal the mechanism of •OH formation induced by heterogeneous catalysts. In the conditions of coexistence of heterogeneous catalyst and DOM, the enhancing effect of heterogeneous catalyst on the •OH formation will be evaluated to clarify synergistic function for •OH formation by heterogeneous catalyst and DOM. The results of this project will provide theoretical basis and technical support for the optimization of ozonation and catalytic ozonation processed for advanced treatment of wastewater.