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RISS 인기검색어
- 검색키워드
- 저자 : Ningtao Mao (검색결과 2 건)
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Hui Zhang,Dou Wang,Cuihong Sheng,Deping Ben,Hailiang Wu,Ningtao Mao 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
In this research, the reactive radical species in photocatalytic activities of a composite photocatalyst made fromPET filaments loaded with Ag-TiO2 nanoparticles under visible light irradiation, in comparison with those of as-modifiedAg-TiO2 nanoparticles, were reported and its photocatalytic mechanism was investigated. The PET filaments were modifiedby using tetrabutyl titanate as the TiO2 precursor and silver nitrate as the dopant in a hydrothermal process. The Ag decoratedTiO2 nanoparticles were synthesized and deposited on the surfaces of PET filaments in the hydrothermal process at 120 oCfor 180 min. The morphology, phase structure, chemical binding state, and optical properties of the PET-Ag-TiO2nanoparticles composites were systemically studied by means of field emission scanning electron microscopy (FESEM), X-raydiffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL)spectroscopy, diffuse reflectance spectroscopy (DRS), and ultraviolet photoelectron spectroscopy (UPS) techniques. Thephotocatalytic activities of the PET-Ag-TiO2 nanoparticles composites were evaluated in the photodegradation of bothmethylene blue (MB) and methyl orange (MO) dyes under visible light irradiation. It was found that, unlike in the asobtainedTiO2 nanoparticles and Ag decorated TiO2 nanoparticles, the photoinduced holes (h+) were the major reactiveradical species in both PET-Ag-TiO2 composite photocatalyst and the PET filaments loaded with TiO2 nanoparticles in theMB photodegradation process. The experimental results also indicated that the PET-Ag-TiO2 nanoparticles composites led tothe improvement of the separation efficiency of photogenerated electron-hole pairs. The enhanced photocatalytic activity ofthe PET filaments coated with Ag decorated TiO2 nanoparticles was ascribed to both the incorporation of Ag nanoparticlesinto TiO2 nanoparticles and the possible infiltration of Ag/Ti nanoparticles into PET polymers. In addition, the wavelengthand intensity of monochromatic light had great influences on the photodegradation rate of dye used, which was closelycorrelated with the maximum absorption wavelength of the dye to be degraded.
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Wendou Chen,Hui Zhang,Wenming Li,Li Mengyang,Hailiang Wu,Ningtao Mao 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
TiO2-based heterojunctions loaded on organic templates (e.g., cotton fabrics) are found to have improvedphotocatalytic activities. However, the role of fibrous templates on their photocatalytic properties has hardly beeninvestigated. In this paper, TiO2-BiFeO3 heterojunction (TiO2-BFO) was immobilized on cotton fibers in hydrothermalprocess. The structures of both TiO2-BFO and cotton-TiO2-BFO composites (C-TiO2-BFO) were systematicallycharacterized. Their photodegradation of Congo red (CR) dyes and photoreduction of Cr(VI) ions under visible lights wereanalyzed. Their active species were identified via trapping experiments and electron spin resonance spectra, and their energyband structures were examined via the density functional theory (DFT). Experimental results indicated that in comparisonwith the TiO2 loaded cotton fibers (C-TiO2), the superior photocatalytic properties of C-TiO2-BFO were attributed to itssubstitutional doping of C/O of cotton into BFO in the TiO2-BFO, which resulted in the narrowed band-gap, the strong lightharvestingcapability, and the fast separation of photoinduced electron-hole pairs of C-TiO2-BFO. Importantly, DFTcalculations testified that the energy band structure of TiO2-BFO could be mediated by constructing the built-in electric fieldbetween TiO2-BFO and cellulose cotton. The hole species were the dominant radicals in the C-TiO2-BFO, while 1O2 specieswere the main radicals in the TiO2-BFO in CR photodegradation process.
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