title: Photodegradation of methylene blue by photocatalyst of D-A-D type polymer/functionalized multi-walled carbon nanotubes composite under visible-light irradiation.
abstract: A donor-acceptor-donor (D-A-D) type monomer (3,6-bis(2-(3,4-ethylenedioxy- thiophene))pyridazine) (EPE) with pyridazine as intermediate unit (acceptor) and 3,4-ethylenedioxythiophene (EDOT) as sealing unit (donor) was successfully synthesized. The functionalized multi-walled carbon nanotubes (f-MWCNT) was covalently linked with polymer chain via chemical oxidative polymerization of monomer EPE to form poly(EPE)/f-MWCNT composite. The prepared composite was characterized by Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-visible absorption spectra (UV-vis), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), and Field emission scanning electron microscope (FESEM), respectively. The photocatalytic activity of poly(EPE)/f-MWCNT was investigated toward degrading methylene blue (MB) dye solution (1 × 10-5M) under visible light irradiation. As expected, the degradation efficiency of poly(EPE)/f-MWCNT is significantly higher than that of either pure poly(EPE) or poly(EPE)/MWCNT for MB dye, especially the kinetic constant of poly(EPE)/f-MWCNT is more than 6 times of poly(EPE)/MWCNT. Besides, the reactive oxygen species trapping experiments indicate that the degradation of MB over the poly(EPE)/f-MWCNT composite mainly results from holes oxidation. Moreover, the enhancement of the photodegradation rate is mainly attributed to the superior stability, strong light absorption ability, and highly effective photo-generated electron-hole pairs of the poly(EPE)/f-MWCNT composite. A reasonable mechanism for the enhanced reactivity was proposed.
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Liu
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China. Electronic address: jruxangul@xju.edu.cn.
authors.forename: Ruxangul
authors.initials: R
authors.lastname: Jamal
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China.
authors.forename: Minchao
authors.initials: M
authors.lastname: Wang
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
authors.affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, 830046, People's Republic of China; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi, 830046, People's Republic of China. Electronic address: tursunabdir@sina.com.cn.
authors.forename: Tursun
authors.initials: T
authors.lastname: Abdiryim
mesh_terms: D002384:Catalysis / Q000528:radiation effects; D008027:Light; D008751:Methylene Blue / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010782:Photolysis; D011108:Polymers / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013876:Thiophenes / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: C000601652:3,4-ethylenedioxythiophene; D037742:Nanotubes, Carbon; D011108:Polymers; D013876:Thiophenes; D008751:Methylene Blue
keywords: D-A-D type polymer; Functionalized MWCNT; Methylene blue; Nanocomposite; Photocatalyst; Visible light