功能化磁性纳米材料检测工业废水中的多环芳烃

Detection of PAHs in industrial wastewater by functionalized magnetic nanomaterials

制备了一种表面含苯基的Fe_(3)O_(4)磁性纳米材料(NPs),在纯水中添加多种不同浓度的多环芳烃(PAHs)标准溶液作模拟水样,探讨了SiO2包合Fe3O4磁性纳米材料(Fe_(3)O_(4)NPs@SiO_(2))与苯基三乙氧基硅烷(PHTS)不同配比、Fe3O4NPs@SiO2-PHTS复合材料的用量、超声时间、解析溶剂等对富集水体中PAHs效果的影响,建立了实际工业废水中PAHs的检测方法。方法的标准工作曲线相关系数(R2)在0.996以上,定量限(LOQs)为0.19~2.5 ng/L,平均回收率为71.1%~105.2%,日内相对标准偏差(RSD)为3.7%~12%,日间RSD为3.5%~13%,在40 min内即可完成1次水样的分析工作。该功能化磁性纳米材料可用于富含PAHs的环境水体检测。

Fe_(3)O_(4) magnetic nanoparticles(NPs)with phenyl groups on the surface was prepared,and a variety of standard polycyclic aromatic hydrocarbons(PAHs)were added to the pure water as a simulated water sample.The effects of different ratios of magnetic nanomaterial(Fe_(3)O_(4) NPs@SiO_(2))to phenyltriethoxysilane(PHTS),the dosage of Fe_(3)O_(4) NPs@SiO_(2)-PHTS composite,ultrasonic time,and resolving solvent on the enrichment of PAHs in water were investigated and a detection method for PAHs in actual industrial wastewater was established.The results showed that the correlation coefficient R^(2) of standard working curve of the method was above 0.996,the limits of quantification(LOQs)were 0.19-2.5 ng/L,the average recoveries were 71.1%-105.2%,the relative standard deviations(RSDs)of the intra-day and inter-day were 3.7%-12% and 3.5%-13%,respectively,and the analysis of the water sample could be completed within 40 min.The functionalized magnetic nanomaterial could be applied in the detection of PAHs-rich environmental water.