MIL-88A光芬顿催化体系中羟基自由基的检测  

Detection of hydroxyl radical in MIL-88A(Fe)Photo-Fenton catalytic system.

作　　者：丁奇 王建凤[1] 王颖[1] 李冰宁[1] 马立利[1] 周欣燃 周阳 冯月超[1] 贾丽[1] 邵鹏[1] 刘艳[1] Ding Qi;Wang Jianfeng;Wang Ying;Li Bingning;Ma Lili;Zhou Xinran;Zhou Yang;Feng Yuechao;Jia Li;Shao Peng;Liu Yan(Beijing Center for Physical and Chemical Analysis,Beijing Engineering Research Center of Food Safety Analysis,Beijing 100089,China)

机构地区：[1]北京市理化分析测试中心,北京市食品安全分析测试工程技术研究中心,北京100089

出　　处：《分析仪器》2021年第4期132-138,共7页Analytical Instrumentation

基　　金：创新工程-预研究-冬奥食品安全检测技术储备及在食品供应基地保障中的应用(PXM2020_178305_000007)。

摘　　要：为了研究MOF光芬顿体系中·OH生成的影响,首先建立了2-羟基对苯二甲酸(HOTP)和对苯二甲酸(TA)高效液相色谱检测方法,检出限分别为0.5μg/L、0.8 mg/L。分析了光照时间和H_(2)O_(2)浓度变化对实验体系的影响,通过测定TA及HOTP的含量间接反映·OH变化,结果表明无光照条件时,反应体系中没有检测到TA消耗及HOTP生成,因此该阶段没有产生·OH;增加光照,在光照60 min内不同体系的HOTP生成量明显递增,1.5 mL/L H_(2)O_(2)反应体系中含量最高,其次是1.0 mL/L,但60 min后有所下降,高浓度H_(2)O_(2)下降趋势较明显,表明此段产生过量的·OH会使HOTP发生降解反应,H_(2)O_(2)浓度越高降解强度越大,而·OH与TA反应仍在继续进行,直至下降到一定浓度后停止反应。通过比较本实验反应体系中检测·OH的高效液相色谱法及荧光分光光度法,对比检出限及分析实际样品得出两种方法均适用于·OH检测,但荧光分光光度法灵敏度低于高效液相色谱法。In order to study the effect of·OH formation in the MOF photo-Fenton system,HPLC methods for detection of HOTP and TA were established.The detection limits were 0.5μg/L and 0.8 mg/L,respectively.The influences of light,light time and H_(2)O_(2) concentration on the experimental system were analyzed.The results showed that TA consumption and HOTP generation were not detected in the reaction system without light.Therefore,·OH was not produced in this stage.The amount of HOTP of different systems increased significantly within 60 minuts,the content of HOTP in 1.5 mL/L H_(2)O_(2) reaction system was the highest,the second was in 1.0 mL/L system.However,the content of HOTP decreased after 60 minuts.HOPT showed a significant decrease under high concentration of H_(2)O_(2).It showed that excessive·OH could cause degradation of HOTP,the higher the concentration of H_(2)O_(2),the greater the degradation intensity of HOTP.The reaction between·OH and TA continued until TA concentration dropped to a certain degree.Comparing the detection limit of the two methods,the HPLC and Fluorescence Spectrophotometry for the detection of·OH in the experimental reaction system,and analyzing the actual samples,it concludes that the two methods are suitable for·OH detection,but the sensitivity of Fluorescence Spectrophotometry is lower than that of HPLC.

关 键 词：羟基自由基 光芬顿反应 金属有机骨架材料 检测 

分 类 号：X832[环境科学与工程—环境工程] O657.72[理学—分析化学]