苯乙烯的三维荧光特性及水污染应急处理

发布时间：2018-04-14 15:27

本文选题：三维荧光光谱 + 苯乙烯　；参考：《光谱学与光谱分析》2016年07期

【摘要】：苯乙烯对人体健康和自然环境具有极大的危害,是国际卫生组织确认的致癌物。历年来,苯乙烯泄漏事故频繁发生,对饮用水安全造成了极大的隐患。对水中苯乙烯污染进行快速监测并采取切实有效的应急处理措施有助于保障饮用水的卫生安全。利用三维荧光光谱技术对苯乙烯的水溶液进行分析,发现在Ex255/Em305处有一个明显的荧光峰,荧光峰值与苯乙烯溶液浓度呈现良好的线性相关,相关系数r达到了0.995 7,其颜色随浓度增加而变深。苯乙烯中共有4个共轭π键,其中苯环具有大的共轭π键结构,乙烯基上同样具有一个共轭π键。同时,苯乙烯的分子结构中,碳原子处于同一个平面上,属于平面构型且具有一定的刚性,符合强荧光物质所具有的特征。因此通过三维荧光扫描结合苯乙烯的荧光特性,能快速测定水体中苯乙烯浓度及判断水体的污染程度。粉末活性炭可以有效地吸附去除水中的苯乙烯。当苯乙烯在源水中的浓度达到《生活饮用水卫生标准》规定的限值0.02 mg·L~(-1)时,采用180目的粉末活性炭,投加量为15rng·L~(-1)时,苯乙烯浓度可降至0.001 mg·L~(-1),去除率达95.5%。
[Abstract]:Styrene is a carcinogen confirmed by WHO because of its great harm to human health and natural environment.Over the years, styrene leakage accidents occurred frequently, which caused great hidden danger to drinking water safety.Rapid monitoring of styrene pollution in water and effective emergency measures are helpful to ensure the sanitation and safety of drinking water.Three-dimensional fluorescence spectroscopy was used to analyze the aqueous solution of styrene. It was found that there was an obvious fluorescence peak at Ex255/Em305, and the fluorescence peak showed a good linear correlation with the concentration of styrene solution.The correlation coefficient r was 0.995, and the color became deeper with the increase of concentration.Styrene has four conjugated 蟺 bonds, in which benzene ring has a large conjugate 蟺 bond structure and vinyl group also has a conjugate 蟺 bond.At the same time, in the molecular structure of styrene, the carbon atom is located on the same plane, which belongs to the plane configuration and has certain rigidity, which accords with the characteristics of the strong fluorescent substance.Therefore, the concentration of styrene in water can be measured quickly and the degree of water pollution can be judged by three dimensional fluorescence scanning combined with the fluorescence characteristics of styrene.Powdered activated carbon can effectively adsorb and remove styrene from water.When the concentration of styrene in the source water reached the limit of 0.02 mg / L ~ (-1) specified in the Sanitary Standard of drinking Water, the concentration of styrene could be reduced to 0.001 mg / L ~ (-1) and the removal rate was up to 95.5when the concentration of styrene reached the limit of 0.02 mg / L ~ (-1), and the dosage was 15rng / L ~ (-1).
【作者单位】：浙江工业大学;
【基金】：国家自然科学基金项目(51478433) 浙江省科技计划项目(2010R50037)资助
【分类号】：O657.3;X832

【相似文献】