Synthesis of poly(3,4-propylenedioxythiophene)/MnO2 composites and their applications in the adsorptive removal of methylene blue

The poly(3,4-propylenedioxythiophene)/MnO2 composites (PProDOT/MnO2) were prepared successfully by soaking the PProDOT powders into potassium permanganate (KMnO4) solution, with the mass ratio of PProDOT and KMnO4 from 2:1 to 1:2. The structure and morphology of composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, ultraviolet visible absorption spectra (UV), X-ray diffraction (XRD), energy -dispersive X-ray spectroscopy (EDX) and field emission scanning electron microscope (FE-SEM). Furthermore, PProDOT/Mn02 composites were tested as the adsorbents for removal of methylene blue (MB) from aqueous solution. The results revealed that the composites were successfully synthesized, and the thiophene sulfur was oxidized into sulfoxide by KMnO4. The highest percentage removal of MB after 30 min was 91% for PProDOT/MnO2 (1:2) composite, and the percentage removal of MB was similar to 12 mg g(-1) after 60 min at initial concentrations of MB dye of 5.6 mg L-1 in the case of PProDOT/MnO2 (1:2) composite. Besides, the adsorption process of PProDOT/MnO2 (1:2) composite was described by pseudo -second -order and Langmuir models. (C) 2016 The Authors. Production and hosting by Elsevier B.V. on behalf of Chinese Materials Research Society. This is an open access article under the CC BY -NC -ND license (hup://creativecommo ns orgili cen ses/by-nc-nd /4.0).

通过将聚（3,4 - 亚丙基二氧噻吩）（PProDOT）粉末浸泡在高锰酸钾（KMnO₄）溶液中，成功制备了聚（3,4 - 亚丙基二氧噻吩）/MnO₂复合材料（PProDOT/MnO₂），其中PProDOT与KMnO₄的质量比从2∶1到1∶2。利用傅里叶变换红外光谱（FTIR）、拉曼光谱、紫外 - 可见吸收光谱（UV）、X射线衍射（XRD）、能量色散X射线光谱（EDX）和场发射扫描电子显微镜（FE - SEM）对复合材料的结构和形貌进行了表征。此外，还测试了PProDOT/MnO₂复合材料作为吸附剂从水溶液中去除亚甲基蓝（MB）的性能。结果表明，复合材料成功合成，噻吩硫被KMnO₄氧化为亚砜。对于PProDOT/MnO₂（1∶2）复合材料，30分钟后亚甲基蓝的最高去除率为91%，在亚甲基蓝染料初始浓度为5.6 mg/L的情况下，PProDOT/MnO₂（1∶2）复合材料60分钟后亚甲基蓝的去除量约为12 mg/g。此外，PProDOT/MnO₂（1∶2）复合材料的吸附过程可用准二级和朗缪尔模型描述。（C）2016作者。由爱思唯尔出版集团代表中国材料研究学会制作和托管。这是一篇在知识共享署名 - 非商业性使用 - 禁止演绎（CC BY - NC - ND）许可下的开放获取文章（http://creativecommons.org/licenses/by - nc - nd/4.0）