Preparation of PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/MnO2 nanocomposites and their application in catalytic degradation of methylene blue.

The nanocomposite materials of poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO), poly(3,4-ethylenedioxythiophene)/MnO2 (PEDOT/MnO2), and poly(3, 4-ethylenedioxythiophene)/graphene oxide/MnO2 (PEDOT/GO/MnO2) were successfully prepared by facile and template-free solution method. The structure and morphology of nanonanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible absorption spectra (UV–vis), field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX), respectively. The catalytic activities of nanocomposites were investigated through the degradation processes of methylene blue (MB) solution under dark, UV light, and nature sunlight irradiation, respectively. The results displayed that nanocomposites were successfully synthesized, and PEDOT/GO had higher conjugation length and doped degree than pure PEDOT. However, the introduction of MnO2 could lead to the reduction of conjugation length and doped degree in PEDOT/MnO2 and PEDOT/GO/MnO2 nanocomposites. The field emission scanning electron microscope (FESEM) analysis also showed that both MnO2 and GO had some effect on the morphology of nanocomposites. The catalytic activities of pure PEDOT and nanocomposites were in the order of PEDOT/GO/MnO2 > PEDOT/MnO2 > PEDOT/GO > pure PEDOT. Besides, the catalytic results also showed that the highest degradation efficiency of MB after 7 h occurred in the PEDOT/GO/MnO2 composite in three irradiation.

通过简便且无模板的溶液法成功制备了聚（3,4 - 乙烯二氧噻吩）/氧化石墨烯（PEDOT/GO）、聚（3,4 - 乙烯二氧噻吩）/二氧化锰（PEDOT/MnO₂）以及聚（3,4 - 乙烯二氧噻吩）/氧化石墨烯/二氧化锰（PEDOT/GO/MnO₂）纳米复合材料。分别采用傅里叶变换红外光谱（FTIR）、紫外 - 可见吸收光谱（UV - vis）、场发射扫描电子显微镜（FESEM）、X射线衍射（XRD）和能量色散X射线光谱（EDX）对纳米复合材料的结构和形貌进行了表征。通过在黑暗、紫外光和自然太阳光照射下亚甲基蓝（MB）溶液的降解过程分别研究了纳米复合材料的催化活性。结果表明，纳米复合材料成功合成，且PEDOT/GO比纯PEDOT具有更高的共轭长度和掺杂程度。然而，MnO₂的引入会导致PEDOT/MnO₂和PEDOT/GO/MnO₂纳米复合材料中共轭长度和掺杂程度降低。场发射扫描电子显微镜（FESEM）分析还表明，MnO₂和GO对纳米复合材料的形貌都有一定影响。纯PEDOT和纳米复合材料的催化活性顺序为PEDOT/GO/MnO₂＞PEDOT/MnO₂＞PEDOT/GO＞纯PEDOT。此外，催化结果还表明，在三种照射条件下，7小时后MB的最高降解效率出现在PEDOT/GO/MnO₂复合材料中。