Li Jiayu, Li Huirong, Guo Jinxin, Zhou Hua, Wang Xuemei, Du Xinzhen
College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.
Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, Lanzhou, China.
J Sep Sci. 2025 Jun;48(6):e70196. doi: 10.1002/jssc.70196.
Well-defined TiO microplates (TiOMPs) were directly achieved on a titanium fiber by the hydrothermal treatment in alkaline solution. The hydrothermal in situ growth of TiOMPs greatly depended on the alkali concentration and hydrothermal temperature. The results proved the formation of epitaxially oriented TiOMPs with rutile structure. The Ti@TiOMPs fiber exhibited improved adsorption selectivity and enhanced adsorption capability for PAHs. After optimizing adsorption conditions, the developed method with Ti@TiOMPs fiber presented good linearity of PAHs in the ranges of 0.05-200 ng/mL with LODs of 0.012-0.161 ng/mL and LOQs of 0.039-0.537 ng/mL. The intra-day and inter-day RSDs for the developed method with a single fiber were 2.59%-4.32% and 3.29%-6.31%, respectively. Moreover, RSDs were found to be 5.48%-8.35% for the developed method with five pieces of fibers fabricated in different batches. Finally, the developed method was applied to selective preconcentration and sensitive determination of target PAHs in environmental water samples. The relative recoveries of target PAHs in real water samples spiked at the concentrations of 5.0 and 10.0 ng/mL were in the ranges of 87.20%-110.6% with RSDs lower than 7.16%. Furthermore, the Ti@TiOMPs fiber was highly stable without loss of adsorption efficiency after 200 adsorption and desorption cycles.
通过在碱性溶液中进行水热处理，在钛纤维上直接制备出了轮廓清晰的二氧化钛微板（TiOMPs）。TiOMPs的水热原位生长在很大程度上取决于碱浓度和水热温度。结果证明形成了具有金红石结构的外延取向TiOMPs。Ti@TiOMPs纤维对多环芳烃（PAHs）表现出改善的吸附选择性和增强的吸附能力。优化吸附条件后，所开发的采用Ti@TiOMPs纤维的方法在0.05 - 200 ng/mL范围内对PAHs具有良好的线性，检测限（LODs）为0.012 - 0.161 ng/mL，定量限（LOQs）为0.039 - 0.537 ng/mL。对于单根纤维所开发方法的日内和日间相对标准偏差（RSDs）分别为2.59% - 4.32%和3.29% - 6.31%。此外，对于由不同批次制备的五根纤维所开发的方法，RSDs为5.48% - 8.35%。最后，所开发的方法应用于环境水样中目标PAHs的选择性预富集和灵敏测定。在浓度为5.0和10.0 ng/mL加标的实际水样中，目标PAHs的相对回收率在87.20% - 110.6%范围内，RSDs低于7.16%。此外，Ti@TiOMPs纤维具有高度稳定性，在200次吸附和解吸循环后吸附效率没有损失。
