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

Zhang L, Jamal R, Zhao Q, Wang M, Abdiryim T - Nanoscale Res Lett (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Oil and Gas Fine Chemicals, Educational Ministry of China, College of Chemistry and Chemical Engineering, Xinjiang University, Shengli Road No.14, Tianshan District, Urumqi, Xinjiang 830046 People's Republic of China ; Key Laboratory of Functional Polymers, Xinjiang University, Shengli Road No.14, Tianshan District, Urumqi, Xinjiang 830046 People's Republic of China.

ABSTRACT
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.

No MeSH data available.


UV–vis absorption spectra of MB dye under dark. (a) PEDOT. (b) PEDOT/GO. (c) PEDOT/MnO2. (d) PEDOT/GO/MnO2.
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Fig6: UV–vis absorption spectra of MB dye under dark. (a) PEDOT. (b) PEDOT/GO. (c) PEDOT/MnO2. (d) PEDOT/GO/MnO2.

Mentions: Figure 6 shows the degradation spectra of MB in the presence of pure PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/MnO2 nanocomposites under dark, respectively. The time profiles of MB degradation with the pure PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/ MnO2 nanocomposites under dark were shown in Figure 7. As can be seen in Figures 6 and 7, the degradation efficiencies of the MB dye by PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/MnO2 nanocomposites are 9.9%, 36.5%, 86.2%, and 92.7% under dark, respectively. According to the SEM analysis, the pure PEDOT exhibits coral-like morphology with a smaller pore size. With the addition of GO, the PEDOT/GO displays flocculent structures with a larger pore size, which is beneficial for the physical adsorption of MB molecule. Furthermore, due to formation of π-π stacking between MB and aromatic regions of the graphene oxide in the PEDOT/GO composite, the physical adsorption of MB molecules can be promoted [16,29]. It should be noted that specific area of pure PEDOT is higher than PEDOT/GO, and the high specific area can enhance the adsorbability of MB by electrostatic interaction between the polymer chains and MB molecules [30]. However, compared with the pure PEDOT (9.9%), the higher degradation efficiency of MB solution occurred in PEDOT/GO (36.5%) composite. This result shows that the presence of GO in PEDOT/GO composite can be the main factor for improving the physical adsorption of MB molecules, suggesting that the GO has higher adsorbability for MB than that of PEDOT. Moreover, the degradation of MB by pure PEDOT and PEDOT/GO composite is physical adsorptive removal of MB molecules. However, the higher degradation efficiencies of MB solution are observed in the case of PEDOT/MnO2 (86.2%) and PEDOT/GO/MnO2 (92.7%) nanocomposites than that of pure PEDOT (9.9%) and PEDOT/GO (36.5%) nanocomposite. As shown in Figure 3, a lot of wrinkles are observed on the flower-like morphology of PEDOT/MnO2, and PEDOT/GO/MnO2 displays flocculent structures with a larger pore size than that of PEDOT/GO. Based on the discussion about the effect of morphology of pure PEDOT and PEDOT/GO on the physical adsorptive removal of MB molecules, it is clear that the flower-like morphology of PEDOT/MnO2 and flocculent structure of PEDOT/GO/MnO2 are beneficial for the physical adsorption of MB molecule on the surface of nanocomposites. However, if the physical adsorptive removal of MB molecules is the decisive factor for enhancing the degradation efficiency of MB solution, the degradation efficiency of MB is impossible to be 86.2% and 92.7% for PEDOT/MnO2 and PEDOT/GO/MnO2, respectively. Thus, the presence of MnO2 in both of PEDOT/MnO2 and PEDOT/GO/MnO2 composites will be the most important factor for determining the degradation efficiency of MB. Previous studies show that the MnO2 is one of the effective catalysts for degradation of MB, which can be attributed to the formation of hydrogen bonding between the hydroxyl groups on the surface of MnO2 and the nitrogen atoms of MB [31]. Therefore, it can be concluded that the presence of MnO2 in PEDOT/MnO2 and PEDOT/GO/MnO2 plays an important role on the enhancement of degradation of MB under dark.Figure 6


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

Zhang L, Jamal R, Zhao Q, Wang M, Abdiryim T - Nanoscale Res Lett (2015)

UV–vis absorption spectra of MB dye under dark. (a) PEDOT. (b) PEDOT/GO. (c) PEDOT/MnO2. (d) PEDOT/GO/MnO2.
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Fig6: UV–vis absorption spectra of MB dye under dark. (a) PEDOT. (b) PEDOT/GO. (c) PEDOT/MnO2. (d) PEDOT/GO/MnO2.
Mentions: Figure 6 shows the degradation spectra of MB in the presence of pure PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/MnO2 nanocomposites under dark, respectively. The time profiles of MB degradation with the pure PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/ MnO2 nanocomposites under dark were shown in Figure 7. As can be seen in Figures 6 and 7, the degradation efficiencies of the MB dye by PEDOT, PEDOT/GO, PEDOT/MnO2, and PEDOT/GO/MnO2 nanocomposites are 9.9%, 36.5%, 86.2%, and 92.7% under dark, respectively. According to the SEM analysis, the pure PEDOT exhibits coral-like morphology with a smaller pore size. With the addition of GO, the PEDOT/GO displays flocculent structures with a larger pore size, which is beneficial for the physical adsorption of MB molecule. Furthermore, due to formation of π-π stacking between MB and aromatic regions of the graphene oxide in the PEDOT/GO composite, the physical adsorption of MB molecules can be promoted [16,29]. It should be noted that specific area of pure PEDOT is higher than PEDOT/GO, and the high specific area can enhance the adsorbability of MB by electrostatic interaction between the polymer chains and MB molecules [30]. However, compared with the pure PEDOT (9.9%), the higher degradation efficiency of MB solution occurred in PEDOT/GO (36.5%) composite. This result shows that the presence of GO in PEDOT/GO composite can be the main factor for improving the physical adsorption of MB molecules, suggesting that the GO has higher adsorbability for MB than that of PEDOT. Moreover, the degradation of MB by pure PEDOT and PEDOT/GO composite is physical adsorptive removal of MB molecules. However, the higher degradation efficiencies of MB solution are observed in the case of PEDOT/MnO2 (86.2%) and PEDOT/GO/MnO2 (92.7%) nanocomposites than that of pure PEDOT (9.9%) and PEDOT/GO (36.5%) nanocomposite. As shown in Figure 3, a lot of wrinkles are observed on the flower-like morphology of PEDOT/MnO2, and PEDOT/GO/MnO2 displays flocculent structures with a larger pore size than that of PEDOT/GO. Based on the discussion about the effect of morphology of pure PEDOT and PEDOT/GO on the physical adsorptive removal of MB molecules, it is clear that the flower-like morphology of PEDOT/MnO2 and flocculent structure of PEDOT/GO/MnO2 are beneficial for the physical adsorption of MB molecule on the surface of nanocomposites. However, if the physical adsorptive removal of MB molecules is the decisive factor for enhancing the degradation efficiency of MB solution, the degradation efficiency of MB is impossible to be 86.2% and 92.7% for PEDOT/MnO2 and PEDOT/GO/MnO2, respectively. Thus, the presence of MnO2 in both of PEDOT/MnO2 and PEDOT/GO/MnO2 composites will be the most important factor for determining the degradation efficiency of MB. Previous studies show that the MnO2 is one of the effective catalysts for degradation of MB, which can be attributed to the formation of hydrogen bonding between the hydroxyl groups on the surface of MnO2 and the nitrogen atoms of MB [31]. Therefore, it can be concluded that the presence of MnO2 in PEDOT/MnO2 and PEDOT/GO/MnO2 plays an important role on the enhancement of degradation of MB under dark.Figure 6

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Oil and Gas Fine Chemicals, Educational Ministry of China, College of Chemistry and Chemical Engineering, Xinjiang University, Shengli Road No.14, Tianshan District, Urumqi, Xinjiang 830046 People's Republic of China ; Key Laboratory of Functional Polymers, Xinjiang University, Shengli Road No.14, Tianshan District, Urumqi, Xinjiang 830046 People's Republic of China.

ABSTRACT
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.

No MeSH data available.