Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance.
Electrochemical Preparation of Polyaniline Nanowires with the Used Electrolyte Solution Treated with the Extraction Process and Their Electrochemical Performance.
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DOI：
10.3390/nano8020103
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发表时间：
2018-02-12
期刊：
影响因子：
--
通讯作者：
Wang S
中科院分区：
文献类型：
--
作者：
Wu Y;Wang J;Ou B;Zhao S;Wang Z;Wang S
苯胺的电化学聚合是制备聚苯胺（PANI）材料最有前途的方法之一。但在此过程中，由于副产物的产生和积累，电聚合一定时间后必须更换电解质溶液，这对PANI产品的形貌、纯度和性能有显着影响。为了降低含苯胺及其聚合副产物的废电解液高昂的处理成本，对废电解液的处理和回收利用是值得研究的。在这里，使用的电解质溶液的成分通过高效液相色谱结合二极管阵列检测（HPLC-DAD）在紫外和可见（UV-Vis）光范围内进行分离和测定。分析结果表明，所用电解液由苯胺、对苯二酚(HQ)、对苯醌(BQ)、苯胺与对苯醌的共聚低聚物(CAB)和酸组成。然后，选择正辛醇和2-辛酮作为萃取物，从用过的电解质溶液中去除HQ、BQ和CAB。随后，通过调节水相中苯胺和酸的浓度来制备回收电解质溶液，并进行电化学聚合过程。最后，通过扫描电子显微镜（SEM）和电化学方法对所得PANI进行了表征。实验结果清楚地表明，由回收的电解质溶液生产的PANI的形貌和比电容可以完全恢复。该研究为苯胺电化学聚合用过的电解质溶液的再利用铺平了道路。
Electrochemical polymerization of aniline is one of the most promising methods to prepare polyaniline (PANI) materials. However, during this process, the electrolyte solution must be replaced after electropolymerization of a certain time because of the generation and the accumulation of the by-products, which have significant effects on the morphology, purity and properties of PANI products. Treatment and recycling of the used electrolyte solution are worthwhile to study to reduce the high treatment cost of the used electrolyte solution containing aniline and its polymerization by-products. Here, the composition of the used electrolyte solution was separated and determined by high performance liquid chromatography coupled with diode array detection (HPLC-DAD) in the range of ultraviolet and visible (UV-Vis) light. The analysis results revealed that the used electrolyte solution consisted of aniline, p-hydroquinone (HQ), p-benzoquinone (BQ), co-oligomers of aniline and p-benzoquinone (CAB) and acid. Then, n-octanol and 2-octanone were selected as extracts to remove HQ, BQ and CAB from the used electrolyte solution. Following that, the recycled electrolyte solution was prepared by adjusting the concentration of aniline and acid of the aqueous phase, and the electrochemical polymerization process was conducted. Finally, the obtained PANI was characterized by scanning electron microscope (SEM) and electrochemical methods. The experimental results clearly demonstrate that the morphology and specific capacitance of PANI produced from the recycled electrolyte solution can be recovered completely. This research paves the way for reusing the used electrolyte solution for aniline electrochemical polymerization.
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