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为了快速检测Fenton试剂氧化降解瓦斯反应体系中生成的羟基自由基(·OH),提出了一种苯甲酸荧光法测定·OH含量的方法。Fenton试剂产生的·OH能与苯甲酸反应生成具有强荧光的羟基苯甲酸,利用荧光强度的变化可间接测定反应体系中·OH的含量,系统研究了H2O2浓度、Fe2+浓度、初始pH值等因素对·OH产生效率的影响。结果表明,H2O2浓度、Fe2+浓度、初始pH值是影响Fenton试剂产生·OH的主要因素,当c(H2O2)=100 mmol/L、c(Fe2+)=2.0 mmol/L、pH=2.5时,溶液荧光强度F最大,同时Fenton试剂降解瓦斯反应体系的·OH生成量最大。
In order to rapidly detect hydroxyl radicals (· OH) generated by Fenton reagent oxidation degradation of gas reaction system, a method of benzoic acid fluorescence determination of · OH content was proposed. · OH generated by Fenton reagent can react with benzoic acid to form hydroxybenzoic acid with strong fluorescence. The content of · OH in the reaction system can be indirectly determined by the change of fluorescence intensity. The factors such as concentration of H2O2, concentration of Fe2 +, initial pH and other factors Effect on the production efficiency of · OH. The results showed that H2O2 concentration, Fe2 + concentration and initial pH value were the main factors influencing the generation of · OH in Fenton reagent. When the concentration of c (H2O2) = 100 mmol / L and c (Fe2 + Fluorescence intensity F was the largest, while Fenton reagent was the most effective way to degrade gas · OH.