g-C_(3)N_(4)/BiOI荧光薄膜制备及其对零价汞的氧化/富集一体化检测  

Preparation of the g-C_(3)N_(4)/BiOI fluorescent film for integrated oxidation and enrichment based detection of elemental mercury

作　　者：宋宁馨 秦茵萍 崔超福 李檬[1] Ningxin Song;Yinping Qin;Chaofu Cui;Meng Li(Department of Environmental Science and Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学环境科学与工程系,保定071003

出　　处：《中国科学:化学》2025年第3期721-734,共14页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:52370110);中央高校基本科研业务费专项资金(编号:2023MS146)资助项目。

摘　　要：燃煤烟气是大气汞的首要排放源,实现烟气中易挥发、长迁移零价汞的便捷、高精度检测,对改善大气环境质量具有重要的指导意义.针对燃煤烟气汞检测存在的流程复杂、准确度低等问题,本文通过超声复合法成功制备出氧化/富集一体化检测Hg^(0)的g-C_(3)N_(4)/BiOI复合荧光薄膜材料(CN/BiOI).CN/BiOI有效抑制了光生电子-空穴对的复合,使其对Hg^(0)的氧化富集效率达到98.2%.同时,本研究通过荧光分析和机器学习技术相结合,对Hg^(0)浓度进行高精度检测.利用机器学习模型对CN/BiOI薄膜的荧光颜色与Hg^(0)浓度之间的关系进行拟合,结果显示Linear和支持向量回归(SVR)两种模型具有优异拟合效果(R^(2)>0.9),证明二者存在良好的线性相关性.综上所述,CN/BiOI复合材料为烟气汞的在线监测及污染控制设备效率评估提供了新的技术手段.Coal-fired flue gas is one of the major sources for atmospheric mercury emissions.Developing convenient and high-precision methods for volatile and long-range migratory elemental mercury(Hg^(0))detection is essential for air quality improvement.To address the challenges of complex procedures and low accuracy in mercury detection in coalfired flue gas,a g-C_(3)N_(4)/BiOI composite fluorescent film(CN/BiOI)is successfully synthesized via an ultrasonicassisted method for integrated oxidation and enrichment-based detection of Hg^(0).The CN/BiOI film efficiently suppressed the recombination of photogenerated electron-hole pairs,achieving an oxidation and enrichment efficiency of 98.2%for Hg^(0).Furthermore,fluorescence analysis was combined with machine learning techniques to achieve highprecision detection of Hg^(0)concentrations.Machine learning models were employed to establish the relationship between the fluorescence color of the CN/BiOI film and Hg^(0)concentrations,with both Linear and support vector regression(SVR)models demonstrating excellent fitting accuracy(R^(2)>0.9),indicating a strong linear correlation.In summary,the CN/BiOI composite material provides a new strategy for real-time mercury monitoring in flue gas,promoting the pollution control system evaluation efficiency.

关 键 词：零价汞检测 光氧化 高精度检测 CN/BiOI 机器学习 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O657.3[理学—分析化学] X831[理学—化学]