新型二氧化钛纳米线纤维选择性固相微萃取环境水样中的紫外线吸收剂  

A Novel Titania Nanowire Fiber for Selective Solid-Phase Microextraction of Ultraviolet Filters in Environmental Water Samples

作　　者：王卓 王菲菲 王子宜 张容[1] 杜军良 王雪梅[1,2] 杜新贞 WANG Zhuo;WANG Fei-Fei;WANG Zi-Yi;ZHANG Rong;DU Jun-Liang;WANG Xue-Mei;DU Xin-Zhen(College of Chemistry and Chemical Engineering,Northwest Normal University;Key Lab of Bioelectrochemistry&Environmental Analysis of Gansu,Lanzhou 730070,China)

机构地区：[1]西北师范大学化学化工学院 [2]甘肃省生物电化学与环境分析重点实验室,兰州730070

出　　处：《分析化学》2019年第8期1276-1282,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.21765020)资助~~

摘　　要：二氧化钛(TiO 2)具有高的热稳定性和化学稳定性、独特的纳米结构形成能力和良好的吸附性能,可作为固相微萃取(SPME)纤维涂层。本研究采用阳极氧化法在Ti纤维基体上原位生长TiO 2纳米线(TiO 2NWs),经800℃热处理可使其表面纳米颗粒化,从而使钛基TiO 2NWs纤维(Ti@TiO 2NWs)用于吸附的有效表面积增加。将热处理后的Ti@TiO 2NWs纤维与HPLC-UV联用,研究了对4类典型芳香族化合物的萃取性能。结果表明,与商用聚丙烯酸酯纤维相比,所组装的纤维对紫外线吸收剂(UVFs)显示良好的萃取选择性和更高的萃取效率。在优化的SPME条件下,本方法对UVFs的线性范围为0.05~300 ug/L,相关系数R>0.999,检出限为0.005~0.045 ug/L。对于50 ug/L的加标水样,单支纤维的日内和日间分析的相对标准偏差(RSDs)分别低于5.4%和6.4%(n=5)。将本方法应用于环境水样中目标UVFs的萃取富集和测定,回收率为85.0%~113.0%,RSDs为4.2%~7.8%。此纤维的组装精密可控,可稳定使用200次以上。Titania(TiO 2)has high thermal and chemical stability,unique nanostructure-forming ability and good adsorption,and can be used as a solid-phase microextraction(SPME)fiber coating.In this work,TiO 2 nanowires(TiO 2NWs)were in-situ grown on Ti wire by electrochemical anodization.Thereafter,the Ti@TiO 2NWs fiber was annealed at 800℃and the nanoparticle-like TiO 2NWs coating was obtained on the Ti fiber substrate.Coupled to high-performance liquid chromatography with ultraviolet detection(HPLC-UV),SPME performance of the annealed Ti@TiO 2NWs fiber was evaluated using typical aromatic compounds as model analytes.As compared with the commercial polyacrylate fiber,the annealed Ti@TiO 2NWs fiber showed good extraction selectivity and high extraction capability for ultraviolet filters(UVFs).The experimental conditions for the extraction of UVFs were optimized.The established SPME-HPLC-UV method with the annealed Ti@TiO 2NWs fiber presented linear ranges from 0.05 ug/L to 300 ug/L with correlation coefficients(R 2)>0.999 and limits of detection from 0.005 ug/L to 0.045 ug/L.Relative standard deviations(RSDs)were below 5.4%and 6.4%for intra-day and inter-day analyses of UVFs at the spiking level of 50 ug/L with the single fiber(n=5),respectively.The developed method was successfully applied to the selective enrichment and sensitive determination of target UVFs in environmental water samples with recoveries from 85.0%to 113%and RSDs from 4.2%to 7.8%.Moreover,the annealed Ti@TiO 2NWs fiber was fabricated in a precise controllable manner and stable for at least 200 extraction and desorption cycles.

关 键 词：二氧化钛纳米线 钛纤维 阳极氧化 热处理 固相微萃取 紫外线吸收剂 

分 类 号：O65[理学—分析化学]