Ma Mingguang, Wei Yunxia, Wei Huijuan, Liu Xianyu, Liu Haixia
College of Chemistry and Chemical Engineering, Lanzhou City University Lanzhou 730070 China
RSC Adv. 2021 Aug 25;11(46):28632-28642. doi: 10.1039/d1ra04405b. eCollection 2021 Aug 23.
In this work, a polypyrrole (PPy)/TiO nanocomposite coating was fabricated by the direct electropolymerization of pyrrole on annealed TiO nanoparticles and evaluated as a novel direct immersion solid phase microextraction (DI-SPME) fiber coating for extraction of trace amounts of pollutants in environmental water samples. The functionalized fiber is mechanically and chemically stable, and can be easily prepared in a highly reproducible manner. The effects of the pyrrole monomer concentration, polymerization voltage and polymerization time on the fiber were discussed. Surface morphological and compositional analyses revealed that the composite coating of nano polypyrrole and titanium dioxide nanoparticles (TiONP) uniformly doped the Ti substrate. The as-fabricated fiber exhibited good extraction capability for phenolic compounds in combination with high performance liquid chromatography-UV detection (HPLC-UV). At the optimum SPME conditions, the calibration curves were linear ( ≥ 0.9965). LODs and LOQs of less than 0.026 μg L and 0.09 μg L , respectively, were achieved, and RSDs were in the range 3.5-7.2%. The results obtained in this work suggest that PPy/TiO is a promising coating material for future applications of SPME and related sample preparation techniques.
在本工作中，通过在退火的TiO纳米颗粒上直接电聚合吡咯制备了聚吡咯（PPy）/TiO纳米复合涂层，并将其评估为一种新型的直接浸入式固相微萃取（DI-SPME）纤维涂层，用于萃取环境水样中的痕量污染物。功能化纤维在机械和化学方面都很稳定，并且可以很容易地以高度可重复的方式制备。讨论了吡咯单体浓度、聚合电压和聚合时间对纤维的影响。表面形态和成分分析表明，纳米聚吡咯和二氧化钛纳米颗粒（TiONP）的复合涂层均匀地掺杂在Ti基体上。制备的纤维与高效液相色谱-紫外检测（HPLC-UV）相结合，对酚类化合物表现出良好的萃取能力。在最佳SPME条件下，校准曲线呈线性（≥0.9965）。分别实现了低于0.026 μg/L和0.09 μg/L的检测限和定量限，相对标准偏差在（分析时）3.5-7.2%范围内。本工作获得的结果表明，PPy/TiO是SPME及相关样品制备技术未来应用中一种有前景的涂层材料。 （原文中“RSDs were in the range 3.5-7.2%.”这里的范围后面括号里内容推测是译者根据语境补充完整，因为英文中没有明确说明是在什么情况下的范围，正常翻译应该就是“相对标准偏差在3.5-7.2%范围内” ）
