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以四苯基钴卟啉为识别分子,可溶性聚酰亚胺为高分子载体,采用静电纺丝技术制备一种负载钴卟啉的聚酰亚胺电纺纤维膜,用于对微量苯胺蒸气的快速检测.结果表明,钴卟啉基团的引入并没有使纺丝条件和过程发生很大的改变,依旧可以得到直径均一、形貌良好的电纺纤维.制备的钴卟啉功能化聚酰亚胺电纺纤维膜卟啉单元负载量高、分布均匀,保持了钴卟啉的基本光谱特性.当置于苯胺蒸气中时,电纺纤维膜中的钴卟啉可与苯胺分子轴向配位,形成有效的能量转移复合物,引起电纺纤维膜的紫外光谱发生改变.并且随着苯胺蒸气浓度的增加,紫外光谱呈现规律性变化,从而达到对苯胺蒸气检测的目的.进一步由紫外光谱计算得到其检测限为7.82 mg/m3.经过5次连续的苯胺蒸气作用—氮气吹扫过程后,电纺纤维膜的紫外吸收光谱可基本回复至原有状态,显示了较好的重现性和优异的可重复使用性.
Taking tetraphenyl cobalt porphyrin as the recognition molecule and soluble polyimide as the polymer carrier, a polyimide electrospun fibrous membrane containing cobalt porphyrin was prepared by electrospinning technology, The results showed that the introduction of cobalt porphyrin did not change the spinning conditions and the process greatly, and the electrospun fibers with uniform diameter and good morphology could still be obtained.Preparation of cobalt porphyrin functionalized poly The imine electrospun fiber membrane has a high loading of the porphyrin unit and has a uniform distribution and maintains the basic spectral characteristics of the cobalt porphyrin.When placed in aniline vapor, the cobalt porphyrin in the electrospun fiber membrane can be axially aligned with the aniline molecule Bit to form an effective energy transfer complex, resulting in the change of the UV spectrum of the electrospun fiber membrane, and with the increase of the aniline vapor concentration, the UV spectrum showed a regular change, so as to achieve the purpose of the aniline vapor detection.Further by the ultraviolet spectrum The calculated limit of detection (LOD) was 7.82 mg / m3. After five continuous aniline vapor-nitrogen purging processes, the UV absorption spectra of electrospun fibrous membranes could be basically restored to the original state, showing good reproducibility Excellent reusability.