摘要
利用恒电势法在钛丝表面原位阳极氧化组装固相微萃取(SPME)纤维,通过考察不同浓度电解质溶液和电解时间对二氧化钛纳米管(TiO2NTs)形成及尺寸的影响来确定最佳的SPME纤维的形貌。结果表明,NH4F在水相中的质量分数为0.5%,乙二醇在水相中的体积分数为50%,氧化电势为20 V,温度为25℃,氧化时间30min的条件下,得到内径为100nm,壁厚为25nm的有序纳米管排列。利用组装得到的二氧化钛纳米管纤维涂层(TiO2 NTs/Ti)与高效液相色谱(HPLC)联用测定水样中的多环芳烃(PAHs)。在优化的萃取条件下,该方法灵敏度高,线性范围宽,选择性和重复性好,操作简便。利用此方法测量了实际水样中的PAHs浓度,得到了令人满意的分析结果。
In this article,solid phase microextraction(SPME)fibers were assembled by in situ anodization on the surface of titanium wire with a constant voltage and anodization time.Effect of the electrolyte solutions of different concentrations(concentration of NH 4 F and ethylene glycol)and electrolysis time on the formation and size of TiO 2 nanotubes(TiO 2 NTs)was investigated.TiO 2 NTs arrays were arranged with the wall thickness of 25 nm and the pore diameter of 100 nm in ethylene glycol and water(volume ratio 1∶1)containing 0.5%mass fraction of NH4F at 20V for 30min at 25℃.Development of titanium dioxide nanotube array as a fiber coating for solid-phase microextraction coupled to high performance liquid chromatography for sensitive determination of polycyclic aromatic hydrocarbons(PAHs)in water.Under the optimized SPME conditions,this method has a higher sensitivity,wider linear range,better selectivity and repetition,and was easier to operate.The proposed method was successfully applied to the preconcentration and determination of target PAHs in river water and wastewater samples with satisfactory analytical results.
作者
马明广
魏云霞
MA Mingguang;WEI Yunxia(College of Chemistry and Chemical Engineering,Lanzhou City University,Lanzhou 730070,China)
出处
《应用化学》
CAS
CSCD
北大核心
2020年第2期218-226,共9页
Chinese Journal of Applied Chemistry
基金
甘肃省科技计划项目(18JR3RA219)
兰州城市学院博士科研启动金(LZCU-BS2018-29)资助~~
关键词
二氧化钛纳米管
组装
固相微萃取
多环芳烃
titanium dioxide nanotube
assemble
solid phase microextraction
polycyclic aromatic hydrocarbons
