(1. 深圳職業(yè)技術(shù)學(xué)院 建筑與環(huán)境工程學(xué)院，深圳 518055；
2. 深圳市工業(yè)節(jié)水與城市污水資源化技術(shù)重點(diǎn)實(shí)驗(yàn)室，深圳 518055)
摘 要: 以網(wǎng)狀銥鉭鈦電極為陽極、石墨板為陰極、飽和甘汞電極為參比電極，設(shè)計(jì)一種在線生成H2O2的電化學(xué)反應(yīng)器，并以銳鈦礦、金紅石及混晶TiO2(TiO2-P25)為光催化劑，研究TiO2光催化學(xué)協(xié)同電化學(xué)催化降解撲草凈的過程。結(jié)果表明：電生H2O2能協(xié)助TiO2可見光催化降解撲草凈，反應(yīng)300 min后，撲草凈降解率達(dá)到100%；在撲草凈的降解過程中，外層的甲基、硫基及氨基被氧化脫除，降解過程生成多種中間產(chǎn)物，降解終產(chǎn)物為三聚氰酸，總有機(jī)碳的去除率為60%~70%。對(duì)反應(yīng)體系的光譜分析顯示：撲草凈的降解涉及羥基自由基(·OH)及超氧自由基(·O2-)的產(chǎn)生和參與。
關(guān)鍵字: 可見光催化；電生H2O2；撲草凈；羥基自由基；超氧自由基
（1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. Shenzhen Key Laboratory of Industrial Water Conservation and
Municipal Wastewater Resources Technology, Shenzhen 518055, China）
Abstract:An electrochemical reactor with hydrogen peroxide in-situ generation was designed using net structure titanium electrode coated with IrO2.Ta2O3(Ir-Ta/Ti) as the anode, graphite phase as the cathode and saturated calomel as the reference electrode. The degradation of prometryn by TiO2 photo-electro-chemical catalytic method was also studied using anatase, rutile and mixing crystalline TiO2 as photocatalysts. The results indicate that prometryn can be degraded by TiO2 visible-light photocatalysis with electrolytic hydrogen peroxide assitance, and the degradation rate reaches 100% after 300 min reaction. In the degradation process of prometryn, the methyl, thio and amino groups in the outer layer are oxidized, the removal rate of total organic carbon (TOC) reaches 60%-70%, and the end product of prometryn degradation is cyanuric acid. Spectrum analysis results indicate that the degradation of prometryn involves the generation and participation of hydroxyl free radical (·OH) and superoxide radical (·O2-) in the system.
Key words: visible light photocatalysis; electrolytic hydrogen peroxide; prometryn; hydroxyl free radical; superoxide radical
